A 29-year-old member asked:
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what is a pet ct scan used for?

4 doctor answers
Dr. Andrew Turrisi
46 years experience Radiation Oncology
CT's define: Anatomy; pet's assess energy consumption (metabolism). Put them together and you see what is bigger than it supposed to be, what's in the neighborhood, and what consumes energy...And the price and cost are quite high.
Answered on Dec 9, 2013
Dr. Joseph Accurso
28 years experience Radiology
Physiology of lesion: Pet scans most often use a radioactive form of glucose, the energy source for most of the cells in our bodies. The pet scanner can detect and measure how much of the radioactive glucose analog, f-18 fdg, is in a particular organ or region. The areas using more glucose are hyper metabolic and generally more worrisome. Our brains and sometimes hearts prefer glucose as food, making it hard to see.
Answered on Mar 12, 2020
Dr. Brian Wosnitzer
17 years experience Nuclear Medicine
PET tracers..: There are many pet tracers which can be used for different indications. Some indications include cardiac perfusion, oncologic imaging, and beta amyloid plaque imaging for alzheimer's. Most commonly the FDG (glucose) tracer is used for oncologic purposes.
Answered on Jun 25, 2014
Dr. Gerald Mandell
51 years experience Nuclear Medicine
Several uses: In most cases PET CT scan is used for detecting metatases in the body. It can also be used for brain with mets, primary tumors, and epilepsy. Injection of glucose metabolite F18 FDG goes to malignant lesions that are highly metabolic,. Usually more sensitive for detecting smaller lesions. Used in staging malignancies and following patient's response to chemotherapy and radiation
Answered on Nov 23, 2014

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A 36-year-old member asked:
Dr. Tushar Patel
25 years experience Radiology
PET/CT scan: You need to fast for 4 hours first, then you will recieve an injection of a small amount of radioactive glucose (i.e. Sugar). Next you will sit in a r ... Read More
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A 35-year-old member asked:
Dr. Eric Wang
A Verified Doctor answered
A US doctor answered Learn more
Not really: Pet-ct involves IV injection of a radiotracer, so there is a needle stick. Then, you have to lay in the scanner without moving for a while, which can ... Read More
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3 thanks
A 39-year-old female asked:
Dr. Brian Wosnitzer
17 years experience Nuclear Medicine
PET/CT vs. CT: Pet/ct scan has 2 sets of images (pet ; ct images) which are fused for interpretation. The ct part provides anatomic info while the pet part provides ... Read More
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A 61-year-old male asked:
Dr. Paul Dorio
A Verified Doctor answered
A US doctor answered Learn more
Glucose: A PET scan actually shows changes due to sugar uptake. So if a "lesion" does not "eat sugar," it won't be seen at PET.

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