PET-CT scan, full body PET-CT scan, positron emission tomography, computed tomography, cancer, cancer’s stage" /> PET-CT scan, full body PET-CT scan, positron emission tomography, computed tomography, cancer, cancer’s stage" />
 
 
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Test Details
Test Code:NM0060
Test Name:Whole body PET/CT scan
Test Details & Preparation
A full body PET-CT scan combines images from a positron emission tomography (PET) scan and a computed tomography (CT) scan that have been performed at the same time using the same machine. Because a CT scan provides detailed pictures of tissues and organs inside the body, while a PET scan reveals any abnormal activity that might be going on there, combining these scans creates a more complete image than either test can offer alone.

A full body PET-CT scan is a diagnostic tool used to detect cancer and find out the cancer’s stage. Knowing the cancer’s stage helps you and your doctor decide what kind of treatment is best and helps predict prognosis. The scan can also be used to locate an area for a biopsy or to evaluate the effectiveness of cancer treatments, such as chemotherapy or radiation therapy. In addition, the CT portion of this scan is often used for radiation therapy treatment planning.

A PET scan creates pictures of organs and tissues inside the body. A small amount of a radioactive substance is injected into a vein. This substance is absorbed mainly by organs and tissues that use the most energy. Because cancer cells tend to use more energy than healthy cells, they absorb more of the radioactive substance. A scanner then detects this substance to produce images of the inside of the body.

A CT scan creates a three-dimensional picture of the inside of the body with an x-ray machine. A computer then combines these images into a detailed, cross-sectional view that shows any abnormalities or tumours. Sometimes, a contrast medium (a special dye) is injected into a patient’s vein to provide better detail in the images.

You may be told to drink nothing but clear liquids beginning at midnight the night before your appointment and instructed to not eat or drink anything for at least four hours before your scan begins.

In addition, tell your doctor about all medications you are taking, and ask whether you should take them on the day of the test. Also discuss any drug allergies or other medical conditions you have, especially any allergic reactions to iodine you may have experienced in the past. Women should tell their doctors if they are breastfeeding or if there is any chance they may be pregnant because a PET-CT scan could put the baby at risk.

A PET-CT scan is not painful. However, you will need to lie still for the entire scan, and you may need to keep your arms raised above your head, which could become uncomfortable. In addition, you may be asked to hold your breath during part of the scan because the motion created by breathing can blur the images.
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