A 29-year-old member asked:
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what is the difference between a pet scan and a ct scan?

3 doctor answers
Dr. Carl Decker
23 years experience Radiology
Usually done togethr: A pet scan measures the uptake of glucose. The uptake of glucose is increased in most cancers. A ct scan is a basically a series of xrays over the area of interest which provides superb anatomic detail. If a ct scan picks up a mass, it may not be able to tell if it is cancerous or benign. Combining the information with the pet scan allow for superior sensitivity and specificity in detecting tumors.
Answered on Aug 28, 2015
Dr. Guido Davidzon
17 years experience Nuclear Medicine
Metabolism / Anatomy: A pet scan is an image study that assess glucose metabolism for different tissues in your body using gamma photons while a ct scan is an anatomic picture of your body that reveals size, shape and intensities of organs using x-rays. Pet scans have several indications, including: cancer, cognitive disorders and heart perfusion stress and viability.
Answered on Aug 28, 2015
Dr. Gerald Mandell
51 years experience Nuclear Medicine
Anatomic/physiologic: Pet scan involves intravenous injection of radio tracer usually f18 fdg.Imaging of whole body occurs for localization of areas of increased glucose metabolism. Malignant tumors usually most active.Ct scan involves x-ray and performs anatomic imaging of parts of body usually head, chest, abdomen, pelvis, or extremities. Pet?Ct combines imaging modalities for anatomic localization of areas of uptake
Answered on Nov 22, 2014

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A 50-year-old male asked:
Dr. Patrick Connerly
A Verified Doctor answered
A US doctor answered Learn more
All are good: It depends on what one is looking for . All 3 types are best for different things
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