A 66-year-old female asked:
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plz explain pet/ct scan xrays and images..how it shows the tumor and metastasis in body

1 doctor answer
Dr. Michael Gabor
33 years experience Diagnostic Radiology
The substances used: in PET are radioactive tracers that accumulate to varying degrees in sites of metabolic activity. Cancers typically have altered/increased metabolic activity relative to normal organs and tend to take up more of the tracer. The radioactivity is detected by the scanner and forms an image which lacks anatomic detail, so it is superimposed over a CT scan, which provides the necessary detail.
Answered on Jan 30, 2019
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