Current Issue


Title- -Exploring the Radiant World of X-Rays in Medicine                                    Date -   21-08-23          

   Author- Rahat Aaliya                 FR-01/11-A020

X-RAY

X-ray is a form of electromagnetic radiation. It is used to diagnose bone fractures and disorders, as well as to examine organs like the lungs, kidneys, ureter, bladder, etc. X-ray is a type of ionizing radiation.


Invention:

X-ray was invented by Wilhelm Conrad Roentgen (W.C. Roentgen) on November 8, 1895, in Germany. X-ray is also known as Roentgen Radiation, named after its inventor.


The first X-ray image obtained was of the hands of Wilhelm Roentgen's wife, taken on December 22, 1895.


Properties:

- X-rays are invisible.

- X-rays have no mass.

- X-rays travel at the speed of light in a vacuum.

- X-rays travel in straight lines.

- They have a very short wavelength.

- They can't be reflected.


Production:

- X-rays are produced when fast-moving electrons collide and interact with the target anode, resulting in sudden emission.

- More than 99% of the electron energy is converted into heat during this emission process, with less than 1% converted into X-rays.


About X-ray:

Various views are taken in general X-rays, such as:

- Anterior to posterior (A.P) view.

- Posterior to anterior (P.A) view.

- Lateral, oblique, OM, Y-projection, frog view, Zanca view, etc.

X-ray offers a variety of views.

Special procedures are performed in X-ray, such as:

- I.V.P, B.M.F.T, B.M, R.G.U, H.S.G, and cholangiogram, among others.

Patients undergo preparation before these special procedures, including contrast injection through veins.


Role of X-ray in the Medical Field:

- Helps confirm clinical diagnoses.

- Assists in studying the anatomy of fractures.

- Aids in studying the displacement of bones due to fractures.

- Detects cracks and stress fractures.

- Plays a role in medico-legal studies.


Name :- Rahat Aaliya

BVRMIT 

5th semester


Title- -HEPATITIS                                     Date -   27-06-23          

   Author- Rahat Aaliya                 FR-01/11-A019

HEPATITIS


Hepatitis is an inflammation of the liver. It may be caused by viral infections, alcohol consumption, several health conditions, or even some medications. Treatment varies based on the type and underlying cause.


Hepatitis refers to an inflammatory condition of the liver. It is commonly the result of a viral infection, but there are other possible causes of hepatitis. These include autoimmune hepatitis and hepatitis that occurs as a secondary result of medications, drugs, toxins, and alcohol. Autoimmune hepatitis is a disease that occurs when your body makes antibodies against your liver tissue.


Types of Hepatitis:

1. Hepatitis A: The hepatitis A virus is transmitted through ingestion of contaminated food and water or through direct contact with an infectious person.

2. Hepatitis B: Hepatitis B is a serious liver infection caused by the hepatitis B virus. For most people, hepatitis B is short-term, also called acute, and lasts less than six months.

3. Hepatitis C: Hepatitis C is a liver infection caused by the hepatitis C virus (HCV). Hepatitis C is spread through contact with blood from an infected person.

4. Hepatitis D: Hepatitis D is spread when blood or other body fluids from a person infected with the virus enter the body of someone who is not infected.

5. Hepatitis E: The virus is transmitted via the fecal-oral route, principally through contaminated water. Hepatitis E is found worldwide, but the disease is most common in East and South Asia.


Symptoms of Hepatitis:

Hepatitis may start and get better quickly. It may also become a long-term condition. In some cases, hepatitis may lead to liver damage, liver failure, cirrhosis, liver cancer, and even death. There are several factors that can affect how severe the condition is. These may include the cause of the liver damage and any illnesses you have. Hepatitis A, for example, is most often short-term and does not lead to chronic liver problems.


The symptoms of hepatitis include:

- Pain or bloating in the belly area.

- Dark urine and pale or clay-colored stools.

- Fatigue.

- Low-grade fever.

- Itching.

- Jaundice (Yellowing of skin or eyes).

- Loss of appetite.

- Nausea and vomiting.

- Weight loss.


Examinations and Tests:

In hepatitis, some pathological tests are done in this procedure. A lab technician draws a small amount of blood from your vein and sends it to a laboratory for testing hepatitis.


Ultrasound (USG) is the best way to find hepatitis or other liver diseases. During a USG exam, a technician will apply gel to the abdomen and use a transducer to send sound waves through the skin. The sound waves bounce off the internal organs and create an image that can be seen on a monitor. In the case of hepatitis, a USG can help identify scarring on the liver and the extent of the damage.


In addition to diagnosing, monitoring the progression of the disease and the effectiveness of treatment is necessary. In some cases, additional imaging tests may be needed to confirm a diagnosis of Hepatitis. These may include CT scans and MRI scans. This can provide more detailed information about the extent of the scarring and the potential for liver failure.


Prevention for hepatitis:

Talk to your healthcare provider about having a vaccine to prevent hepatitis A and hepatitis B. Steps for preventing the spread of hepatitis B and C from one person to another include:

- Avoid sharing personal items, such as razors or toothbrushes.

- Do not share drug needles or other drug equipment (such as straws for snorting drugs).

- Clean blood spills with a mixture of one part household bleach to nine parts water.

- Do not get tattoos or body piercings with instruments that have not been cleaned properly.


Name :- Rahat Aaliya

BVRMIT 

4th semester

Saurav Kumar 

BVRMIT -VI Sem 

Student ZHI


Title- -  Liver Cirrhosis                             Date -   17-02-23          

   Author-Saurav Kumar     FR-01/11-A017

Liver cirrhosis is a chronic disease characterized by the scarring of liver tissue, leading to liver dysfunction and potential liver failure. The liver is a vital organ responsible for filtering toxins from the blood, producing bile for digestion, and storing energy. When the liver is damaged, it can no longer perform these functions effectively, leading to serious health problems.


There are many potential causes of liver cirrhosis, including long-term alcohol abuse, viral hepatitis, and nonalcoholic fatty liver disease. Symptoms of liver cirrhosis may include fatigue, jaundice, itching, abdominal swelling, and confusion.


One important tool for diagnosing liver cirrhosis is ultrasound imaging. Ultrasound uses high-frequency sound waves to create images of the internal organs. An ultrasound scan can help identify the presence of liver cirrhosis, as well as other liver diseases.


During an ultrasound exam, a technician will apply a gel to the abdomen and use a transducer to send sound waves through the skin. The sound waves bounce off the internal organs and create images that can be seen on a monitor. In the case of liver cirrhosis, an ultrasound can help identify the scarring on the liver and the extent of the damage.


In addition to diagnosing liver cirrhosis, ultrasound can also be used to monitor the progression of the disease and the effectiveness of treatment. For example, if a patient is undergoing treatment for viral hepatitis, regular ultrasound exams can help doctors determine if the treatment is reducing the amount of scarring on the liver.


In some cases, additional imaging tests may be needed to confirm a diagnosis of liver cirrhosis. These may include CT scans, MRI scans, or liver biopsy. A liver biopsy involves taking a small sample of liver tissue for examination under a microscope. This can provide more detailed information about the extent of the scarring and the potential for liver failure.


It is important to note that while ultrasound can be a valuable tool for diagnosing liver cirrhosis, it is not always able to detect early stages of the disease. In some cases, additional testing may be required to confirm a diagnosis.


In conclusion, liver cirrhosis is a serious condition that can have significant impacts on a person's health and quality of life. Early diagnosis and treatment are essential for managing the disease and preventing further liver damage. Ultrasound imaging can be an important tool for diagnosing and monitoring liver cirrhosis, but it should always be used in conjunction with other diagnostic tests and under the guidance of a healthcare professional.



Title- -CT Scan in Epilepsy                         Date -   31-01-23          

   Author Shashi                 FR-01/11-A016

Epilepsy is a neurological disorder characterized by recurring seizures. These seizures are caused by abnormal electrical activity in the brain. In order to diagnose epilepsy, medical professionals often use a variety of imaging techniques to get a clear picture of the brain. One of the most commonly used imaging techniques is the CT (Computed Tomography) scan.


The CT scan is a non-invasive procedure that uses X-rays and a computer to produce detailed images of the brain. It provides detailed information about the structure of the brain, including the size, shape and position of the brain and its various components. This information is useful for identifying any structural abnormalities that may be contributing to the seizures.


One of the main benefits of CT scans in epilepsy is their ability to identify lesions or abnormalities in the brain. These may include tumors, bleeding, cysts, or other changes in the brain tissue. These changes can be the underlying cause of epilepsy and can be treated or monitored with the help of a CT scan.


CT scans can also help in the diagnosis of focal epilepsy. This type of epilepsy is caused by a specific area of the brain and is diagnosed when seizures originate from that specific area. A CT scan can help identify the location of this focal point, making it easier for medical professionals to diagnose and treat the condition.


Another benefit of CT scans in epilepsy is their ability to detect any changes in the brain that occur over time. This is particularly useful for people who have been diagnosed with epilepsy and are receiving treatment, as it can help determine if the treatment is effective or if there have been any changes in the condition.


In conclusion, CT scans play a crucial role in the diagnosis and treatment of epilepsy. They provide detailed images of the brain, which helps medical professionals identify any structural abnormalities that may be contributing to the seizures. This information can also be used to determine the location of the focal point, monitor changes in the brain over time, and monitor the effectiveness of treatment. If you or someone you know has been diagnosed with epilepsy, it is important to discuss the benefits of a CT scan with a medical professional.

Shashi Ranjan



Single Plane and Bi Plane Imaging in Angiography                                                                                              Date -   20-12-22                             Author Stelin Selwamoni                                                                                                      FR-01/11-A015

Cath lab is an examination room in a hospital or clinic with diagnostic imaging equipment used to visualize the arteries of the heart and the chambers of the heart and treat any stenosis or abnormality found.

Most catheterization laboratories are "single plane" facilities, those that have a single X-ray generator source and an x-ray image intensifier for fluoroscopic imaging. Older cath labs used cine film to record the information obtained, but since 2000, most new facilities are digital. The latest digital cath labs are biplane (have two X-ray sources) and use flat panel detectors.

Biplane imaging is one of the most advanced interventional medical imaging technologies available. It uses two rotating cameras, one on each side of the patient, to take simultaneous images. ... When combined on a computer screen, the two sets of images form a 3-D portrait of the area the doctor wants to study.

Biplane imaging also allows doctors to follow the path of blood flow through your vessels and to create a "roadmap" for reaching and treating the precise location of disease or malformation. Also known as angiography, this process involves inserting a small catheter into an artery, a similar procedure to getting an IV. New Technology Expands Treatment for Stroke, Aneurysms and Peripheral Vascular Disease

Biplane Angiography System expands diagnostic and treatment options for vascular and neurovascular problems, including stroke, aneurysms and peripheral vascular disease. Benefits include:

Procedure times are shorter because two angles of the imaging area are captured simultaneously

Less contrast dye is required and radiation exposure is reduced

The images show spatial relations more accurately, allowing physicians to rapidly target problem areas

Treatment for peripheral artery disease is improved because the degree of blockage is more visible. This allows physicians to view their position throughout the stenting process.

Biplane Specifications

Capture images from two axes using two c-arms

Fast image reconstruction

Shorter examination time

More efficient than single plane

Low radiation dose

 

Biplane Combines Diagnosis and Treatment

Biplane imaging can also be used to path the blood flow through vessels, which helps to find the precise location of the disease or malformation.

Using a small amount of injectable dye to make the blood flow easier to see, the biplane imaging cameras take x-rays that the doctor can view in real time.

This helps them quickly determine if there are blockages or aneurysms, and determine the best way to provide treatment.

In many cases, the doctor can use the detailed images to help guide minimally invasive procedures to treat blockages, aneurysms or blood clots in the brain – right there in the interventional suite. 

Combining diagnosis and treatment into one procedure saves valuable time, and can make all the difference in recovery for patients with stroke or other severe neurovascular complications. 

Biplane Imaging Capabilities

This versatile biplane technology means our medical team can provide comprehensive care for even the most complex patients.

For example, it enables endovascular coiling for the treatment of aneurysms. Doctors use a catheter to guide a wire into the aneurysm. The wire coils up inside the aneurysm, stopping the blood flow and sealing off the aneurysm from the artery.

Biplane imaging is especially helpful during cerebral vascular angiography, an interventional radiology procedure used to take images of the blood vessels in the brain. The 3-D images can help locate blockages that cause ischemic stroke and identify aneurysms and arteriovenous malformations (a tangle of arteries and veins) that cause hemorrhagic stroke.

Biplane can also assist doctors with stent placement and guiding catheters through the brain. Biplane is also used during neuro coiling, a minimally invasive procedure that blocks blood flow to an aneurysm.

It can also help cut off blood supply to tumors.

Effectiveness of Biplane Angiography Compared to Monoplane Angiography for Vascular Neuro-Interventions

The advantages that a biplane system can provide in terms of safety, quality of care, support to university teaching programmes based on best practices, enhanced capability in performing complex procedures, this technology should be implemented with a responsibility to collect outcome data to optimise the clinical protocol regarding the dose of ionising radiation delivered.

Bi-plane labs-advanced technology for neurovascular procedures

Time is of the essence when it comes to neurological ailments. Be it a stroke, aneurysm or head trauma, fast, safe and timely intervention is essential for a good outcome of the patient. Keeping this in mind, the best hospitals in India are investing in Biplane Cath Labs for Neuro-intervention.

This technology aids in the Diagnosis as well as treatment of disorders related to brain spinal cord, neck and face. 

Diagnostic:

Digital subtraction cerebral angiography

Digital subtraction spinal angiography


Therapeutic:

Cerebral aneurysm,

Subarachnoid hemorrhage

Stroke/ Paralytic attack

Intracranial hemorrhage

Carotid Stenosis/blockage

Brain arteriovenous malformation (AVM)

Spinal arteriovenous malformation and fistula

Cerebral Venous Sinus Thrombosis

Inferior Petrosal Sinus Sampling

Bi-Plane Cath Labs vs Single-Plane Cath Labs

Single Plane Versus BiPlane

There are scads of options on the table as you begin doing your homework and narrowing down the field. One of the major options will run across is whether you want a single or bi-plane cath lab system.

 Single and bi-plane cath labs differ from one another in several main ways:

1. Image Acquisition Speed

2. Specialization

3. Space Requirements

4. Site Preparation


Image Acquisition Speed

 Because bi-plane systems capture image data from detectors on two axes, they are able to acquire 3D images faster. This is especially useful in neurovascular and electrophysiology (EP) procedures. Single-plane labs are also capable of 3D imaging, but the time it takes the C-arm to move and the software’s reconstruction process cause a delay. Additionally, 3D software is not native to single-plane labs and must be added for 3D imaging to be done.

Specialization

The type of work you plan to use your lab for will have at least as much (if not more) weight in your decision between a bi-plane and a single-plane cath lab as any other difference we'll discuss here. Bi-plane and single-plane cath labs are designed with certain specialties in mind. If your facility is planning for a dedicated neuro or EP lab, for example, you'd be best served by a bi-plane system. And if other study types come into that room on occasion, you can adjust settings to use only one of your system's C-arms.

If the work leans in a more general/blended direction (balloons, stents, angio runs, etc.) a single-plane lab can be flexible across a number of specialties and, if properly equipped with 3D software, also suffice for Neuro and EP.

Space Requirements

With a second C-arm and the cabinets of electronics required to run it, anyone would guess that a bi-plane system has a larger footprint than a single-plane system, but many don't realize how much bigger. Take for instance the GE Innova series: GE recommends a space almost 200 square feet larger for bi-plane! If the work you're planning to do calls for bi-plane technology, don’t get scared by these dimensions. Experienced installers can do a lot to get either version of a system into more conservative spaces, but be aware that you might need more room than you think.

Cath Lab Site Preparation

 We can probably guess what this paragraph is going to say: double the c-arms = double the site prep. That might be an oversimplification, but there will be significantly more involved in getting your space ready for a bi-plane cath lab. There needs to be a ceiling support installed for the second c-arm, additional rigging is necessary, and the system has an overall larger footprint.

Any cath lab has both ceiling (monitors, maybe the gantry) and floor-mounted (table, maybe gantry) components. For a bi-plane, you have to plan for both a floor and a ceiling-mounted gantry. In the case of the Innova biplane, there’s around 2,000 lbs of additional weight hanging from the ceiling vs. its single plane counterpart, including the ceiling “Lateral Positioner” (gantry), additional rails, and additional monitors.

Cost Difference

 Bi-plane cath labs simply come with more "stuff", therefore they cost more than single-plane systems. However, while there are double the critical components (tubes, collimators, detectors, computers), service pricing isn't twice as much. Currently, service coverage for a bi-plane cath lab averages 25-30% higher than service for a single-plane system.






Digital Substraction Angiography                                                                                                                     Date -   19-12-2022

Monday                                                                                                                                        FR-01/11-A014

DSA technique

Digital subtraction angiography is used to produce images of the blood vessels without interfering shadows from overlapping tissues. This provides a clear view of the vessels and allows for a lower dose of contrast medium 

It should be noted that since image subtraction causes a decrease in signal-to-noise ratio, the subtraction images appear noisier than the source images. The inevitable solution to this is to increase mA. There are also algorithms in place for reducing scatter.

Procedural technique

For every purpose, there is at least one technique, but common to them all is the application of DSA for visualization:

Postprocedural care

This depends on the nature of the procedure and whether it was performed on an inpatient or outpatient basis.

Patient should be immobilized for 4-6 hours and keep on supine position. Frequent observations should be done to look for puncture site hematomas, which is the commonest complication. 

Complications

Complications can be categorized into local and systemic complications:

Local complications (puncture site):  

Systemic complications:

See specific procedures for specific complications.





Rise in sudden heart attacks among healthy young Indians. What's driving it?© Provided by India Today                                            Date -   17-12-2022

Story by Tirtho Banerjee • Tuesday                                                              FR-01/11-A013

Cases of sudden heart attacks and strokes among healthy, young and middle-aged Indians are becoming prevalent, a survey by LocalCircles, a community social media platform, has revealed. And these growing medical conditions are impacting both the vaccinated and unvaccinated people.   

Rise in sudden heart attacks among healthy young Indians. What's driving it?© Provided by India Today

As many as 51% of people have one or more individuals in their close network who have experienced heart or brain stroke, blood clots, neurological complications, cancer acceleration or other sudden medical conditions in the last two years, the survey said.

The percentage of those knowing one or more individuals with sudden severe ailments or complications rose from 31% to 51% within a year, the study found.

Also Read | Bride's father dies while dancing day before wedding in Uttarakhand

A total of 62% of the people in their close network experiencing such severe conditions were double dose vaccinated; 11% were single dose vaccinated while 8% were unvaccinated, the study added.

Interestingly, 61% of the people in their close network experiencing severe medical conditions had experienced Covid once or more while 28% said their contacts with such severe conditions did not have Covid, pointed out the survey, which received over 32,000 responses from citizens located in 357 districts of India.

Over 200 million people worldwide may currently be having long Covid condition where they are experiencing myocarditis, pericarditis, brain fog or memory issues, sleep apnea, fatigue, joint pain and other health conditions, according to researchers.

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In the last three months, many healthy, young and middle-aged individuals, both men and women, have experienced a heart attack and died. In several of these cases, the individual was engaged in some physical activity like dance, gym, walking etc. when they experienced cardiac arrest. What is driving such sudden deaths?

"Stroke has been seen as a manifestation of Covid-19 in various studies showing that 0.9% to 23% of Covid-19 patients developed stroke," stated Bengaluru-headquartered Narayana Health. Based on its study of Covid-19 impact, Narayana Health in a blog post stated stroke can manifest in severely affected Covid-19 patients who initially develop Covid-19 symptoms and later on develop stroke as a multi-organ involvement. Few studies have shown that some patients present with stroke as an initial manifestation and later on are found to have Covid-19; these are young patients without risk factors for brain stroke.

Also Read | 16-year-old dies while playing cricket in UP's Kanpur, heart attack suspected

Though the Ministry of Health and Family Welfare came out with a 'National Comprehensive Guidelines for Management of post-Covid sequelae" for doctors last year, not much seems to have been done to inform citizens, both vaccinated and unvaccinated, who survived more than one bout of Covid or its variants, on possible complications and the need to avoid Covid reinfections, the survey underlined.

The government guidelines at the onset state "cardiovascular sequelae not only occur in symptomatic Covid-19 patients but have also been reported in asymptomatic patients. Up to 20%–30% of patients hospitalized with severe Covid-19 have evidence of myocardial involvement manifested by elevated troponin levels, venous thromboembolism, heart failure and arrhythmias".

Sachin Taparia, founder of LocalCircles, said, "The need of the hour here is for the government to take extensive research on these severe medical conditions experienced by people and study this in the context of the impact of Covid by variant and the impact of vaccine by vaccine make and batch numbers. At the same time, the number of Covid infections experienced should also be considered. All of this will bring some clarity to the issue as to what are some of the root causes behind these severe medical conditions experienced by people. It will also enable us to get better prepared for what could be coming."




Vesicovaginal fistula                                    Date -   02-12-2022

USG Case Study- Dr SURAJ RAI         FR-01/11-A012

Hello everyone, good morning,  

Yesterday on 01-12-2022 a patient came to my clinic and told me about her complications with urine discharge, Actually, she was  suffering from multiple time involuntary urination through the vagina (especially at night) and pain in the internal vagina, 

When I heard that the Involuntary discharge of urine through the vagina, It immediately hit in mind that it could be a case of VVF(vesicovaginal fistula).

On ultrasound, I saw a Fistulous track between the posterior wall of the bladder and the vaginal loop and an echogenic stone trapped there.

The gap was measuring about 5.t mm and the minimal collection was noted in the vaginal loop which echoes the pattern same as the filled urinary bladder .so in my view it is the case of VVF.

So here I want to tell you all about the vaginal fistula. The actual vaginal have mainly two portions anterior wall and the posterior wall, if a fistula( gap) forms in the anterior wall, it is called an anterior genital fistula, and whereas gap forms in the posterior wall it is called a posterior genital fistula,  anterior genital fistula can be formed between the urinary bladder, ureters, and urethra 


Note 

-Fistulous track between urinary bladder. and vagina- vesicovaginal fistula.


 -ureter and vagina - ureterovaginal fistula.


-Urethra and vagina - urethrovaginal fistula.


Posterior genital fistula can form between the colon/intestine and rectum,

If a fistulous track between 


-Colon and vagina- colonovaginal fistula /enterovaginal fistula.


-Rectum and vagina- rectovaginal fistula.


Other causes of genital fistula:


Genital injury,conginital birth during childbirth prolonged labor presses the unborn child tightly against the pelvis, otherwise, it can happen after DNC, Hysterectomy, or any pelvis operation. But in my experience, I had always found it after hysterectomy. some other causes like rectocele, colonel, cystocele, etc.


Symptom - vaginitis, recurrent infection, recurrent discharge, lower pain.


Let's discuss treatment,

 guys once a fistula forms then the only way to treat is a surgical procedure 

The vesicovaginal fistula is typically repaired either by transvaginal approch or laparoscopically, if the patient had multiple transvaginal procedures done then sometimes attempt the final repair through a large abdominal incision or laparotomy.

Here some complications may possible after surgery. 


1- recurrent formation of fistula

2-injury to ureter, bowel, or intestine.

3-vaginal shorting.

 ...


By- Dr.Suraj Rai.



Scanned by Dr Suraj 

Title -Cardiovascular System Summary Notes                             Download Pictorial Notes of CVS

Prepared by Shafi                           Fifth Semester 

BVRMIT Dr Zakir Husain Institute, Patna                                          26-11-2022


The cardiovascular system includes: 

The heart, a muscular pump

The blood, a fluid connective tissue

The blood vessels, arteries, veins and capillaries

Blood flows away from the heart in arteries, to the capillaries and back to the

heart in the veins

There is a decrease in blood pressure as the blood travels away from the heart

Arterial branches of the aorta supply oxygenated blood to all parts of the body

Deoxygenated blood leaves the organs in veins

Veins unite to form the vena cava which returns the blood to the heart


Pulmonary System

This is the route by which blood is circulated from the heart to the lungs and

back to the heart again

The pulmonary system is exceptional in that the pulmonary artery carries

deoxygenated blood and the pulmonary vein carries oxygenated blood


Hepatic Portal Vein

There is another exception in the circulatory system – the hepatic portal vein


Veins normally carry blood from an organ back to the heart

The hepatic portal vein carries blood from the capillary bed of the intestine to

the capillary bed of the liver

As a result, the liver has three blood vessels associated with it


Arteries and Veins

The central cavity of a blood vessel is called the lumen

The lumen is lined with a thin layer of cells called the endothelium

The composition of the vessel wall surrounding the endothelium is different in

arteries, veins and capillaries

Arteries carry blood away from the heart

Arteries have a thick middle layer of smooth muscle

They have an inner and outer layer of elastic fibres

Elastic fibres enable the artery wall to pulsate, stretch and recoil, thereby

accommodating the surge of blood after each contraction of the heart


Smooth muscle can contract or become relaxed

This contraction or relaxation brings about vasodilation or vasoconstriction to

control blood flow

During strenuous exercise the arterioles leading to the muscles undergo

vasodilation – the circular muscle in the arteriole wall is relaxed and the lumen is

wide

This allows an increased blood flow to the skeletal muscles


At the same time, the arterioles leading to the small intestine undergo

vasoconstriction

The circular muscles are contracted and the lumen is narrow

As a result, this reduces the blood flow to the gut

Veins carry blood back to the heart

The muscular layer and layers of elastic fibres in the vein wall are thinner than

those in an artery because blood flows along a vein at low pressure

The lumen of a vein is wider than that of an artery

Valves are present in veins, to prevent the backflow of blood

Following two slides compare an artery and vein


Capillaries and Exchange of Materials

Blood is transported from arterioles to venules by passing through a dense

network of blood vessels called capillaries

All exchanges of substances between blood and living tissue takes place through

capillary walls

Capillary walls are composed of endothelium and are only one cell thick


Plasma is a watery yellow fluid containing dissolved substances such as glucose,

amino acids, blood cells, platelets and plasma proteins

Blood arriving at the arteriole end of a capillary bed is at a higher pressure than

blood in the capillaries

As blood is forced into the narrow capillaries, it undergoes pressure filtration

and much of the plasma is squeezed out through the thin walls

This liquid is called tissue fluid


The only difference between plasma and tissue fluid is that plasma has proteins

Tissue fluid contains a high concentration of dissolved food, oxygen, useful ions

etc.

These diffuse, down a concentration gradient, into the surrounding cells

Carbon dioxide and other metabolic wastes diffuse out of the cells, down a

concentration gradient, into the tissue fluid to be excreted

Tissue fluid and Lymph

Much of the tissue fluid returns to the blood in the capillaries at the venule end

of the capillary bed

This is brought about by osmosis

Tissue fluid lacks plasma proteins so it has a higher water concentration than

the blood plasma

Some of the tissue fluid does not return to the blood in the capillaries

This excess tissue fluid is absorbed by thin-walled lymphatic vessels

When the tissue fluid is in the lymphatic vessel it is called lymph

Tiny lymph vessels unite to form larger vessels

Flow of lymph is brought about by the vessels being compressed when muscles

contract during breathing, movement etc.

Larger lymph vessels have valves to prevent backflow

Lymph vessels return their contents to the blood via two lymphatic ducts

These enter the veins coming from the arms

Structure and Function of the Heart


Continuous circulation of blood is maintained by a muscular pump, the heart

The heart is divided into 4 chambers, two atria and two ventricles

The right atrium receives deoxygenated blood from all parts of the body via the

vena cavae

Deoxygenated blood passes into the right ventricle before leaving the heart

through the pulmonary artery

The pulmonary artery divides into two branches, each leading to a lung

Oxygenated blood returns to the heart by the pulmonary veins

It flows from the left atrium to the left ventricle before leaving the heart by

the aorta

The wall of the left ventricle is more muscular and thicker than that of the

right ventricle

The left ventricle is required to pump blood all around the body

The right ventricle only pumps blood to the lungs

Valves between the atria and ventricles are the atrio-ventricular (AV) valves

Valves prevent the backflow of blood

The presence of valves ensures the blood flows in one direction through the

heart


Semi-lunar valves are present at the origins of the pulmonary artery and the

aorta

These valves open during ventricular contraction allowing flow into the arteries

When arterial pressure exceeds ventricular pressure, they close

Cardiac Function

At each contraction the right ventricle pumps the same volume of blood through

the pulmonary artery as the left ventricle pumps through the aorta

Heart rate (pulse)

This is the number of heart beats per minute

Stroke volume

This is the volume expelled by each ventricle on contraction

Cardiac output is the volume of blood pumped out of a ventricle per minute

It is summarised by the following equation –

CO = HR X SV

HR is heart rate, SV is stroke volume

Pulse, health indicator

If a person is fit, the quantity of cardiac muscle present in their heart wall is

greater and more efficient than that of an unfit person

A very fit person tends to have a lower pulse rate than an unfit person – the fit

person’s heart is larger and stronger

A fit person’s stoke volume is greater

A fit person’s heart does not need to contract as often to pump an equal volume

of blood round the body

Title-Interventional Radiology                          Date 24-11-2022                                                                 FR-01/11-A010  

Author-Azmat Ali ,  Co-Author -Prof Fazal Ahmad                  

                                

Interventional radiology helps to diagnose and treat disease.  Wide range of medical conditions can be treated by inserting various small tools, such as catheters or wires from outside the body. X-ray and imaging techniques such as C Arm, U Arm, CT scan, Ultrasound etc. help to guide the radiologist. Interventional radiology can be used instead of surgery for many conditions and even it is very useful during surgical procedure. Most IR treatments are minimally invasive alternatives to open and laparoscopic surgery. As many IR procedure starts with passing a needle through the skin to the target it is some time called pinhole surgery.

 

Interventional radiologists do a variety of procedures, including:

·         Angiography. This is an X-ray of the arteries and veins to find blockage or narrowing of the vessels, as well as other problems.

·         Angioplasty. The doctor puts a small balloon-tipped catheter into a blood vessel. Then he or she inflates the balloon to open up an area of blockage inside the vessel.

·         Embolization. The doctor puts a substance through a catheter into a blood vessel to stop blood flow through that vessel. This can be done to control bleeding.

·         Gastrostomy tubes. The doctor puts a feeding tube into the stomach if you can’t take food by mouth.

·         Intravascular ultrasound. The doctor uses ultrasound to see inside a blood vessel to find problems.

·         Stent placement. The doctor places a tiny mesh coil (stent) inside a blood vessel at the site of a blockage. He or she expands the stent to open up the blockage.

·         Foreign body removal. The doctor puts a catheter into a blood vessel to remove a foreign body in the vessel.

·         Needle biopsy. The doctor puts a small needle into almost any part of the body, guided by imaging techniques, to take a tissue biopsy. This type of biopsy can give a diagnosis without surgery. An example of this procedure is called the needle breast biopsy.

·         IVC filters. The doctor puts a small filter into the inferior vena cava (IVC). This is a large vein in your abdomen. The filter catches blood clots that may go into your lungs

·         Injection of clot-dissolving medicines. The doctor injects clot-dissolving medicines such as tissue plasminogen activator. This medicine dissolves blood clots and increases blood flow to your arms, legs, or organs in your body.

·         Catheters insertions. The doctor puts a catheter into a large vein to give chemotherapy medicines, nutrition, or haemodialysis. He or she may also put in a catheter before a bone-marrow transplant.

·         Cancer treatment. The doctor gives the cancer medicine directly to the tumour site.

Title- -AHTESHAM                                                                                            Student of 4th Semester BVRMIT 

22 Nov 2022 FR-01/11-A009


Computed tomography


Computed tomography (CT), also known as, especially in the older literature and textbooks,

computerized axial tomography (CAT), is an imaging modality that uses x-rays to build cross-sectional

images (“slices”) of the body. Cross-sections are reconstructed from measurements of attenuation

coefficients of x-ray beams passing through the volume of the object studied.


CT is based on the fundamental principle that the density of the tissue passed by the x-ray beam can be

measured from the calculation of the attenuation coefficient. Using this principle, CT allows the

reconstruction of the density of the body, by a two-dimensional section perpendicular to the axis of the

acquisition system.


The CT x-ray tube (typically with energy levels between 20 and 150 keV), emits N photons

(monochromatic) per unit of time. The emitted x-rays form a beam that passes through the layer of

biological material of thickness Δx. A detector placed at the exit of the sample, measures N + ΔN

photons, ΔN smaller than 0. Attenuation values of the x-ray beam are recorded and the data is used to

build a 3D representation of the scanned object/tissue.


There are two processes of absorption: the photoelectric effect and the Compton effect. This

phenomenon is represented by a single coefficient, mju.


In the particular case of CT, the emitter of x-rays rotates around the patient and the detector, placed on

diametrically opposite sides, picks up the image of a body section (beam and detector move in

synchrony).


Unlike x-ray radiography, the detectors of the CT scanner do not produce an image. They measure the

transmission of a thin beam (1-10 mm) of x-rays through a full CT of the body. The image of that section

is taken from different angles, and this allows to retrieve the information on the depth (in the third

dimension).


To obtain tomographic images of the patient from the “preprocessed” CT dataset, the computer uses

complex mathematical algorithms for image reconstruction.


If the x-ray at the exit of the tube is made monochromatic or quasimonochromatic with the proper filter,

one can calculate the attenuation coefficient corresponding to the volume of irradiated tissue by the

application of the general formula of absorption of the x-rays in the field (see Figure 1).


The outgoing intensity I(x) of the beam of photons measured will depend on the location. I(x) is smaller

where the body is more radiopaque.


Sir Godfrey Hounsfield, the co-developer of CT, chose a scale that reflects the four basic x-ray densities

in the human body, with the following values:


Air = -1000 HU (Hounsfield units)

Fat = -60 to -120 HU

Water = 0 HU

Compact bone = +1000 HU

The image of the section of the object irradiated by the x-ray is reconstructed from a large number of

measurements of attenuation coefficient. It gathers together all the data coming from the elementary

volumes of material through the detectors. Using the computer, it presents the elementary surfaces of

the reconstructed image from a projection of the data matrix reconstruction, the tone depending on the

attenuation coefficients.


The CT image is a digital image and consists of a square matrix of elements (pixel), each of which

represents a voxel (volume element) of the tissue of the patient.


In conclusion, a measurement made by a detector CT is proportional to the sum of the attenuation

coefficients.


The typical CT Image is composed of 512 rows, each of 512 pixels, i.e., a square matrix of 512 x 512 =

262,144 pixels (one for each voxel). In the process of the image, the value of the attenuated coefficient

for each voxel corresponding to these pixels needs to be calculated.


Each image point is surrounded by a halo-shaped star that degrades the contrast and blurs the boundary

of the object. To avoid this, the method of filtered back projection is used. The action of the filter

function is such that the negative value created is the filtered projection, when projected backwards, is

removed, and an image is produced, which is the accurate representation of the original object.


The CT deals with the attenuation of the x-rays during the passage through the body segment. However,

several features distinguish it from conventional radiology: the image is reconstructed from a large

number of measurements of attenuation coefficient.


Before the data are presented on the screen, the conventional rescaling was made into CT numbers,

expressed in dimensionless Hounsfield Units (HU), as mentioned above. CT numbers based on

measurements with the EMI scanner invented by Sir Godfrey Hounsfield 6, a Nobel prize winner for his

work in 1979, related the linear attenuation coefficient of a localized region with the attenuation

coefficient of water, the multiplication factor of 1000 is used for CT number integers.


So, the signal transmitted by the detector is processed by the PC in the form of digital information, the

CT image reconstruction.


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Terminology

Although it is common to hear and see the use of the term “CT scan”, the addition of the word “scan” is

redundant in most use cases. For example, “Mrs JS had a CT scan of her chest” is rendered no less

understandable if instead “Mrs JS had a CT of her chest” is used. Indeed the addition of the word scan

here is entirely superfluous; in the same tautological vein, stating “MRI scan” is also pointless. Quite

clearly “bone scan” is different as the term scan here is being used as a synonym for scintigraphy. “Mrs

JS had a bone scan” is unintelligible if “Mrs JS had a bone” replaces it!


However, calling the hardware used to obtain the CT, a CT scanner is acceptable, not least so that a

reader understands that the text is referring to the hardware itself and not the digital image outputted.

Although, in many cases, the context will mean that, for example, talking about how “we have installed

a new CT”, means that the word scanner is not always necessary


Title- Biliary Atresia  -Author -Ramjan Ansari                                      Student of 4th Semester BVRMIT 

18 Nov 2022 FR-01/11-A008


Title - Malaria                                                                                          Download

Author -Abdul Majid Khan                                                                                                                     17-11-22

 BVMRIT 4th Sem Student  , Dr Zakir Husain Student                                                                       FR-01/11-A004

                                     

MALARIA 

  

Malaria  is a serious and sometimes life-threatening tropical disease that is caused by a parasite and spreads  through mosquitoes. 

It kills more than 445,000 people a year, many of them children in Africa. 

Malaria is caused by plasmodium parasites, which are carried by anopheles mosquitoes 

Causes of Malaria 

There are many factors that can cause malaria, such as – 

Bitten by a malarial vector (Anopheles stephensi) 

Use of shared and infected syringes. 

Organ transplantation. 

Transfusion. 

From an infected mother to her baby during birth. 

VECTOR 

Only female mosquitoes spread the malaria parasites. When a mosquito bites a person who has malaria, it  drinks the person’s blood , which contains the parasites. When the mosquito bites another person, it injects  the parasites into that person. That’s how the disease spreads. 

TYPES OF MALARIA 

There are four species of plasmodium parasites that affect humans. 

Plasmodium falciparum , P. vivax , P. malariae , P. ovale. 

But two of them are considered the most dangerous:

P. falciparum.This is the most common malaria parasite in Africa, and it causes the most malaria-related  deaths in the world. P. falciparum multiplies very quickly, causing serious blood loss and clogged blood  vessels.

P. vivax. This is the malaria parasite most commonly found outside of sub-Saharan Africa, especially in Asia  and Latin America. This species can lie dormant, then rise up to infect your blood months or years after the  mosquito bite. 

LIFE CYCLE OF MALARIA

Malaria parasite exists in the form of a motile sporozoite. The vector of malaria i.e. the female  Anopheles mosquito transmits the malarial sporozoites into the hosts. When an infected  mosquito bites a human, the sporozoites are injected into the blood through the mosquito’s  saliva. 

The sporozoites travel into our body and accumulate in the liver. These parasites initially multiply  within the liver, by damaging the liver and rupturing the blood cells in the body. Malaria kills by  causing the destruction of the red blood cells in the host. The parasites reproduce asexually in  the RBCs, bursting the cells and releasing more parasites to infect more cells. The rupture of  red blood cells by the malaria parasite releases a toxin called hemozoin which causes the patient  to experience a condition known as the chills. 

When the female Anopheles mosquito bites an infected human, the parasites enter the  mosquito’s body along the human blood it is drinking. It is inside the mosquito’s body that the  actual development and maturing of the parasite happens. The parasites produced in the human  body reach the intestine of the mosquito where the male and females cells fertilize each other to  lead to the formation of a sporozoite. On maturing, the sporozoite breaks out the mosquito’s  intestine and migrate to the salivary glands. Once they reach salivary glands, they wait till the  mosquito bites another human and the process of infection and disease begins all over again. It  is prudent however to observe that the complete development of the malaria parasite takes  place in two different hosts; humans and mosquitoes. 


Symptoms of malaria 

Symptoms of malaria are exhibited within 7 to 18 days of being infected. Common symptoms  include: 

Fever, fatigue, chills, vomiting, and headaches 

Diarrhoea, anaemia and muscle pain 

Profuse sweating and convulsions 

Bloody stools. 

In severe cases, malaria can be devastating; it can lead to seizures, coma and eventually,  death.

Sir Ronald Ross and his study on the transmission of the disease helped carve the way for future  scientists to effectively combat the disease. His deep research showed that specifically, the  female Anopheles stephensi mosquito is the vector of the disease, and addressing this problem  will prevent malaria and in turn, save countless lives. 

Prevention of malaria 

Malaria is one of the major causes of preventable death in the world today. It affects more than  500 million people worldwide and causes 1 to 2 million deaths every year. It is a  tropical infectious disease and almost 90 per cent of the cases are from Sub-Saharan Africa. 

There are two ways to deal with malaria – prevent the mosquito bite from happening (i.e.  preventative steps) or attack the parasites once they have infected the body. 

The first method advocates the use of mosquito nets and mosquito repellents such as  permethrin to prevent mosquitoes from biting. The second form of treatment uses a chemical  called Quinine present in the bark of a cinchona tree. A form of drug chloroquine has proven very  effective against malaria even though it is not a vaccine. 

Malaria Treatment 

The treatment your doctor recommends will depend on things like: 

The type of parasite you have 

How bad your symptoms are 

The geographic area where you got infected 

Your age 

Whether you’re pregnant 

Medications doctors use to treat malaria include: 

Chloroquine or hydroxychloroquine. Your doctor may recommend one of these drugs if your  symptoms aren’t serious and you’re in an area where the parasite hasn’t become resistant to  chloroquine. 

Artemisinin-based combination therapy (ACT). This combines two medicines that work in  different ways. They’re used to treat milder cases of malaria or as part of a treatment plan for more  serious cases. 

Atovaquone-proguanil, artemether-lumefantrine. These combinations are other options in  areas where the parasite has become resistant to chloroquine. They also can be given to children. Mefloquine. This medication is another option if chloroquine can’t be used, but it’s been linked to  rare but serious side effects related to your brain and is only used as a last resort. 

Artesunate. If your symptoms are severe, your doctor may recommend this drug as treatment for  the first 24 hours, then follow it with 3 days of artemisinin-based combination therapy. 

Some parasites that cause malaria have become resistant to almost all the medicines used to treat the  illness, so researchers are always looking for new drugs that work. 

Malaria Complications

Some people are more likely to have serious health problems if they get malaria, including: 

Young children and infants 

Older adults 

People who travel from places that don’t have the vaccine 

Pregnant women and their unborn children 

These health problems can include: 

• Coma 

• Cerebral malaria (brain damage caused by swelling) 

• Pulmonary edema 

• Liver, kidney, and spleen failure 

• Anemia (when you lose too many red blood cells) 

Very low blood sugar



Title -Transform X-ray, Introducing New Systems

Featuring Dynamic Digital Radiography at RSNA                        Download

Author -Abdullah Saikh                                               BVMRIT 4th Sem Student  , Dr Zakir Husain Student                                                                                                       FR-01/11-A005

                                     



November 3, 2022 -Konica Minolta Healthcare Americas, Inc., a leader in medical

diagnostic imaging and healthcare information technology, announces the introduction

of new digital radiography (DR) solutions that will continue to transform the clinical

value of X-ray. In 2020, Konica Minolta Healthcare launched Dynamic Digital

Radiography (DDR), and now the company is extending this advancement to the new

KDR Flex Overhead X-ray System. Konica Minolta previously announced DDR on the

Chiropractic Straight Arm and the mKDR Xpress Mobile X-ray System, which recently

received US FDA 510(k) clearance for the DDR option. These new systems and the

AeroDR Glassless family of flat panel detectors will be launched at the 2022 Annual


Meeting of the Radiological Society of North America (RSNA), November 27 –

December 1, 2022.


The KDR Flex Overhead X-ray System is a next-generation, smart radiography system

that delivers an array of workflow innovations in addition to incorporating DDR. The

system automatically tracks and aligns the tube to the table or wall stand, facilitating

precision in positioning. The KDR Flex Overhead X-ray System has the flexibility to be

configured as a manual, semi-automated or fully automated system to optimize

workflow, reduce operator fatigue and increase patient satisfaction. A powerful X-ray

generator and Automatic Exposure Control further optimize image quality and help

minimize patient dose. The result is a more effortless system operation that enhances

both the technologist and patient experience.


Konica Minolta shatters the glass ceiling with the latest innovation in wireless digital

detectors. With the AeroDR Glassless Flat Panel Detectors there is no glass substrate,

just a thin film transistor (TFT), further decreasing the panel weight and, as important,

reducing the distance between the scintillator and electronics for superior sensitivity

and outstanding image quality. The AeroDR family of flat panel detectors are renowned

for durability, a powerful 7-year power cell warranty and exceptional high definition

resolution at 100 μm and 200 μm. AeroDR Glassless Flat Panel Detectors are available

in Konica Minolta systems and retrofits to help facilities take advantage of a smart

imaging solution for greater efficiency and optimal image quality.


Konica Minolta is delivering more capabilities with digital radiography that advance and

redefine imaging diagnostics and are available on multiple systems to best meet each

customer’s most demanding needs,” says Guillermo Sander, PhD, Marketing Director for

Digital Radiography, Konica Minolta Healthcare. “Our commitment is to do more with

primary imaging, continually evolving to provide clinicians with diagnostic information

never before available. The ultimate goal is to enhance patient care by enabling better

decisions, sooner.”


With the mKDR Xpress Mobile X-ray System with DDR, clinicians can now capture

anatomy in motion and observe physiological changes during respiration or swallow

studies, right at the patient’s bedside or in the ER, OR, CCU or ICU. DDR adds significant

clinical value to imaging performed at the point-of-care with an exam that is fast and

versatile at a low radiation dose.


DDR was initially introduced on the company’s acclaimed KDR Advanced U-Arm. DDR is

a leap forward in DR technology that acquires individual images at high speed and low

dose. The resulting cine loop enables clinicians to observe anatomical motion over

time, enhancing diagnostic capabilities and providing clinicians with a way to visualize

anatomy like never before.

DOC-20221116-WA0015. - Local Creator ABD.pdf

Author Md Ahtesham Khan 

Student Dr Zakir Husain Institute                                       4th Semester 

FR-01/11-A007                                                       Date 17-11-2022

DOC-20221112-WA0016. - Abdullah Saikh.pdf

Md Abdullah BVRNIT 4th Sem 

Topic Frequency ,Wavelength ,Resolution and Depth in USG

 FR-01/11-A006                                                         Date 17-11-2022

IMG20221114123337~3.jpg

Author -Abdullah                                                              Download PDF     

Student of 4th Semester BVRMIT                             FR-01/11-A002



12 Nov 2022

 Abdullah

Use of Doppler Ultrasonography to Predict the Outcome of Therapy for Renal-Artery Stenosis

BACKGROUND

Prospectively identifying patients whose renal function or blood pressure will improve after

the correction of renal-artery stenosis has not been possible. We evaluated whether a high

level of resistance to flow in the segmental arteries of both kidneys (indicated by resistance-

index values of at least 80) can be used prospectively to select appropriate patients for

treatment.

METHODS

We evaluated 5950 patients with hypertension for renal-artery stenosis using color Doppler

ultrasonography, and we measured the resistance index as follows: [1 – (end-diastolic

velocity ÷ maximal systolic velocity)] × 100. Among 138 patients who had unilateral or

bilateral renal-artery stenosis of more than 50 percent of the luminal diameter and who

underwent renal angioplasty or surgery, the procedure was technically successful in 131 (95

percent). Creatinine clearance and 24-hour ambulatory blood pressure were measured

before renal-artery stenosis was corrected; 3, 6, and 12 months after the procedure; and

yearly thereafter. The mean (±SD) duration of follow-up was 32±21 months

RESULTS

Among the 35 patients (27 percent) who had resistance-index values of at least 80 before

revascularization, the mean arterial pressure did not decrease by 10 mm Hg or more after

revascularization in 34 (97 percent). Renal function declined (defined by a decrease in the

creatinine clearance of at least 10 percent) in 28 (80 percent); 16 (46 percent) became

dependent on dialysis; and 10 (29 percent) died during follow-up. Among the 96 patients (73

percent) with a resistance-index value of less than 80, the mean arterial pressure decreased

by at least 10 percent in all but 6 patients (6 percent) after revascularization; renal function

worsened in only 3 (3 percent), all of whom became dependent on dialysis; and 3 (3 percent)

died (P<0.001 for the comparison with patients with a resistance-index value of at least 80).

CONCLUSIONS

A renal resistance-index value of at least 80 reliably identifies patients with renal-artery

stenosis in whom angioplasty or surgery will not improve renal function, blood pressure, or

kidney survival.


Md Abdullah. From Samastipur 


IMG20221114123451~3.jpg

Download PDF

Title- -Ultrasound knobology 

Author -Abdul Majid Khan  ,Student of 4th Semester BVRMIT 

12 Nov 2022 FR-01/11-A003


Dr. Zakir Husain institute Patna

12 Nov 2022

Abdul Majid Khan 

अल्ट्रासाउंड नॉबोलॉजी अल्ट्रासाउंड 

Ultrasound 

A basic understanding of the physics and orientation ofHowever, standing in front of an ultrasound machine requires some solid judgment – ​​sometimes nobology

This article  covers the basics of probe and probe selection as well as the buttons found on typical ultrasound machines. While these controls are fairly standard, there are variations from machine to machine and users will need to spend some time familiarizing themselves with the actual equipment before entering a patient room. Some additional equipment and logistics concerns are also discussed. 

Probes are typically described by the size and shape of their face ("footprint"). Selecting the correct probe for the situation is essential to obtaining good pictures, although there may be times when more than one probe may be appropriate for a given examination. There are three basic types of probes used in emergency and critical care point-of-care ultrasound: linear, curved, and phased array. Linear (sometimes called vascular) probes are generally higher frequency, better for imaging superficial structures and vessels, and are often also called vascular probes. Curvilinear probes may have a wider footprint and lower frequency for transabdominal imaging, or a tighter array (wider field of view) and higher frequency for endocavitary imaging. A phased array probe electronically steers the beam in a close array, producing an image that appears to come from a point and is good for obtaining between the ribs, such as a cardiac ultrasound. 

Curved and phased array probes both produce field or "pie-shaped" images, narrower in the near field and wider in the far field, while linear probes typically produce rectangular images on the screen. 

Straight Linear Array Probe 

(Figure 4-1A)is designed for surface imaging. The crystals align in a linear fashion within a flat head and produce sound waves in a straight line. The image formed is rectangular in shape (Fig. 4-1b). This probe has high

frequencies (5-13 MHz), which provides better resolution and less penetration. Therefore, this probe is ideal for imaging superficial structures and for ultrasound-guided procedures.

 Figures are available in PDF so download this article