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Doctor insights on: What Can A Pet Scan Reveal

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What can a pet scan reveal?

What can a pet scan reveal?

Several things: An f18-fdg pet scan will highlight cells in your body that are consuming glucose at a different rate (usually higher) than its surrounding tissues. A neoplasm with abnormal growth consumes more glucose and thus could be revealed with this test . It is a very sensitive but not very specific test. Several other things that are not neoplasms such as infections or inflammation would also be revealed. ...Read more

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Dr. Guido Davidzon
291 doctors shared insights

Pet Scan (Definition)

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 ...Read more


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What can a pet scan show?

What can a pet scan show?

What is the question: Currently pet scans are widely use for evaluation of glucose metabolism in the body. In oncology, is use to for initial metabolic characterization of tumors, metastases as well as for treatment response and surveillance. In cardiology, pet scans are use to assess heart ischemia and viability and in neurology the study is use to evaluate cognitive disorders, epilepsy and brain tumors ...Read more

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How do a pet scan and a MRI scan differ?

How do a pet scan and a MRI scan differ?

See below: An MRI or magnetic resonance imaging is a study that provides anatomical description of a part of your body. A pet scan can provide further information aside from how it looks or appears. It utilizes radioactive material or tracers that see how cells in your body function. It can detect cancer cells not evident on MRI or ct, heart disease, infection and even neurological conditions like dementia. ...Read more

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How do a pet scan and a CT scan differ?

How do a pet scan and a CT scan  differ?

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. ...Read more

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What can a CT scan show that an ultrasound can't show?

What can a CT scan show that an ultrasound can't show?

Better details: The resolution, details shown, on ct is more effective than that of ultrasound. Ultrasound shows liquids e.g. Cysts and effusion better and is cheaper but in obese patients ultrasound has limited penetration. Accordingly, ultrasound, in these patients, is usually replaced by ct that views fatty tissues better and penetrates as deep as needed for better resolution. ...Read more

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What would a PET scan show that a CT scan may not for a person with pancreatic cancer?

What would a PET scan show that a CT scan may not for a person with pancreatic cancer?

PET in cancer: PET scans are used to detect areas of abnormally increased metabolism, while CT scans only detect areas of differing density or lucency to radiation. So an abnormality like an area of scarred old tumor might look abnormal on CT scan but not have increased metabolism indicating active cancer on PET scan. False positives still occur with both, but they tend to commplement each other. ...Read more

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What can an MRI show that a CT can't?

What can an MRI show that a CT can't?

It depends: Both are very good at imaging various parts of the body. Depending on the body part and the question being asked, ct or MRI may be better. In general, MRI can "see" the soft tissues a little better (e.g., brain and spinal cord, rotator cuff) and ct is sometimes better for looking at the bones (e.g., facial fractures, sinuses). Doctors work closely with radiologists to determine the best test. ...Read more

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How is a cat scan and an MRI different?

Contrast difference: Ct uses a combination of xrays shot from multiple directions to look at differences in tissue density. Mri uses strong magnetic fields instead of xrays to differentiate tissues and gives much better contrast than ct. Ct is typically used in the acute setting to see if there is blood or major abnormalities. Mri is a more specific exam to differentiate abnormalities such as stroke or tumor. ...Read more

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A cat scan without contrast can that still detect a brain tumor ?

A cat scan without contrast can that still detect a brain tumor ?

Not always: It is much harder to detect smaller lesions on non-contrast head ct, but large tumors causing swelling or pressure on other parts of the brain can usually be detected. Usually brain MRI with contrast is more sensitive and gives me a more detailed picture when I am trying to evaluate for brain tumors. ...Read more

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What can a pelvic CT scan show that an ultrasound doesnt?

What can a pelvic CT scan show that an ultrasound doesnt?

A few things: Better look at bowel, enlarged lymph nodes, areas of infection, and all the bones. Also better characterizes many abnormalities seen on ultrasound. ...Read more

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Ct scan can reveal a brain tumour and an MRI showed nothing. Which to believe?

Ct scan can reveal a brain tumour and an MRI showed nothing. Which to believe?

Strange: Usually an MRI is more sensitive (better) at detecting rumors than CT. Did the radiologist who read the MRI have access to the CT and its report? It is possible that something that was thought to be a mass on a CT turned out not to be one on MRI. ...Read more

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How is a CT scan and an MRI different?

How is a CT scan and an MRI different?

MRI vs CT: The main difference is that CT uses ionizing radiation and MRI uses radiowaves (non-ionizing radiation). It is the ionizing radiation that causes injury to the DNA and potential to develop a cancer down the road. In general, CT is good at looking a differences in radiation absorption (x-ray density). MRI is good at looking at subtle chemical differences (water and fat) in tissues. ...Read more

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What can a CT scan of the jaws reveal?

Number of things: Fractures, bone tumors, dental disease, and arthritis of the temporomandibular joints, for ex. ...Read more

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What does a pet scan of my esophageal cancer show that a CT scan doesn't?

What does a pet scan of my esophageal cancer show that a CT scan doesn't?

Metastasis: A pet scan is helpful in identifying metastasis of the cancer, or spread to other organs such as the liver or bone, as well as spread to adjacent or distant lymph nodes. Abnormal images on the pet scan will glow with metabolic activity. ...Read more

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How do bone scan and a pet scan differ?

Tracers..: The tracers are different. Bone scan usually uses TcMDP and PET scan uses F18-FDG (glucose). The bone scan is good for showing osteoblastic bone lesions and shows increased bone activity around a metastasis but not the actual metastasis itself. The PET can show glucose uptake in the actual tumor itself. PET is better for lytic bone lesions. CT part of PET/CT can show lytic and blastic lesions. ...Read more

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Possible for a 6.6mm tumor to not show up on X-ray or CT scan?

A cm is: Roughly a half-inch, so 6.6 is a little more than half that and quite easy to not been seen on ct, and unlikely to be seen on a plain film...And I am speaking of chest. Abdomen or pelvis even easier to miss. ...Read more

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How could a CT scan find an abnormality but a MRI come clean?

CT/MRI: They form images based on different physical properties, so certain things may be better delineated on one or the other. CT generally has better spatial resolution, MRI better soft tissue contrast. They are subject to different types of artifacts, which might obscure something on one, but not the other. ...Read more