A 45-year-old member asked:
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how do a pet scan and a ct scan differ?

2 doctor answers
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 Jan 6, 2014
Dr. Brian Wosnitzer
17 years experience Nuclear Medicine
PET vs. CT: Pet scan usually refers to pet/ct where pet and ct scans are acquired ; fused to take advantage of both functional and anatomic information. At some institutions, the ct performed with pet is a low dose ct and does not include oral or IV contrast. Other institutions perform a high (full dose) ct with IV and oral contrast which provides better quality images and the advantage of contrast.
Answered on Jun 10, 2014

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