CT scanning�sometimes called CAT scanning�is a noninvasive medical test that helps physicians�diagnose and treat medical conditions.

This imaging technique combines special x-ray equipment with sophisticated computers that helps construct multiple images or pictures of the inside of the body. These cross-sectional images of the area being studied can then be examined on a computer monitor or printed.

These images give a better view of internal organs, bone, soft tissue and blood vessels in greater clarity and details than x-ray, that helps radiologists more easily interpret and diagnose problems such as cancers, cardiovascular disease, infectious disease, trauma and�musculoskeletal disorders.

CT imaging�is used extensively in studying the chest, abdomen and pelvis because it provides detailed, cross-sectional views of all types of tissue.

This is often the preferred method for diagnosing many different cancers, including lung, liver and pancreatic cancer, since the image allows a physician to confirm the presence of a tumor and measure its size, precise location and the extent of the tumor's involvement with other nearby tissue. This also helps in the detection, diagnosis and treatment of vascular diseases that can lead to stroke, kidney failure or even death. It is more commonly used to assess for�pulmonary embolism�as well as for�abdominal aortic aneurysms.

A CT�scan also helps in the following:

• Injuries to the lungs, heart and vessels, liver, spleen, kidneys or other internal organs in cases of trauma
• Treatment of tumors and abscess drainages
• Treatment of tumors
• Post surgical assesment
• Detection of osteoporosisby measuring bone density.

The patient is positioned on the CT examination table, usually lying flat on your back or possibly on your side or on your stomach. Straps and pillows may be used to help you maintain the correct position and to hold still during the exam.

If contrast material is used, it will be swallowed, injected through an�intravenous line (IV)�or administered by enema, depending on the type of examination.

CT Angiogram.

Frontal or coronal view of chest-3D slab image showing pulmonary vessels.

Next, the table will move quickly through the scanner to determine the correct starting position for the scans. Then, the table will move slowly through the machine as the actual CT scanning is performed.

You may be asked to hold your breath during the scanning.

When the examination is completed, you will be asked to wait until the technologist verifies that the images are of high enough quality for accurate interpretation.

CT scanning of the body usually lasts between five and 30 minutes.

Most CT exams are painless, fast and easy. With�helical CT, the amount of time that the patient needs to lie still is reduced.

Though the scanning itself causes no pain, there may be some discomfort from having to remain still for several minutes. If you have a hard time staying still, are claustrophobic or have chronic pain, you may find a CT exam to be stressful. The technologist or nurse, under the direction of a physician, may offer you a mild sedative to help you tolerate the CT scanning procedure.

If an intravenous contrast material is used, you will feel a slight pin prick when the needle is inserted into your vein. You may have a warm, flushed sensation during the injection of the contrast materials and a metallic taste in your mouth that lasts for a few minutes. Occasionally, a patient will develop itching and hives, which can be relieved with medication. If you become light-headed or experience difficulty breathing, you should notify the technologist or nurse, as it may indicate a more severe allergic reaction. A radiologist or other physician will be available for immediate assistance.

Advantages

• Painless, noninvasive and accurate
• Able to visualize in a detailed form both hard and soft tissues all at the same time
• Help in looking at internal injuries or hemorrhage in emergency situations
• Real-time imaging, helps during invasive procedures such as needle biopsies and needle aspirations
• No side effects

• Excessive exposure to radiation can lead to cancer though the risk is minimal
• Not suitable for pregnant women
• Allergic reaction to contrast materials

The other Radiology Procedures are:

• Angiography
  
• MRI
  
• Positron Emission Tomograhy - PET Scan�� etc

Few Major Hospitals for Computerized Tomography (CT) Scan are:

• Wockhardt Hospitals
  
• Apollo Hospitals
  
• Max Healthcare
  
• Piyavate Hospital
  
• Florence Nightingale Hospital
  

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