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Doctor insights on: Pet Scan After Chemotherapy

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How is pet CT scan done?

How is pet CT scan done?

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 recliner chair for about 70 minutes to allow the glucose to distribute throughout you. Then you will lie on your back on the pet/ct scanner (a tunnel shaped machine) for 20 minutes. There are no side effects from the test or restrictions afterwards. ...Read more

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Dr. Guido Davidzon
292 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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After cancer surgery i had 2 clear pet scans.Nw after 5 yrs the pet scan is abnormal. Possible causes?

After cancer surgery i had 2 clear pet scans.Nw after 5 yrs the pet scan is abnormal. Possible causes?

Not enough info...: It is possible to have an abnormal scan at 5 years but I do not know enough about your history and what was abnormal in this scan. There are many sources of false positive on pet scan but without seeing your images or reports and without your exact history it is difficult to determine what the status is. ...Read more

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Had Hida scan for gallstones & months later multiple mammos for stereotactic biopsy (calcification-benign)-dangers to all this radiation?

Had Hida scan for gallstones & months  later multiple mammos for stereotactic biopsy (calcification-benign)-dangers to all this radiation?

The danger is tiny: The risk of induced cancer from a HIDA scan and dozens of mammogram images is incredibly small. In fact, some would claim the risk could barely be calculated reliably. See: http://www.riainvision.com/exams/hida_scan.aspx Note, we all get x ray radiation naturally every day. There is real risk with repeated studies such as CT scans. For instance, one CT study of the chest equals 100 chest x rays. ...Read more

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Odds of pet scan missing bone cancer?

Odds of pet scan missing bone cancer?

Yes: Pet measure metabolic activity and yes they miss bone tumour and metastasis if small, not much metabolic activity and bone scan, MRI is better. ...Read more

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Dr. Liawaty Ho Dr. Ho
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Oct 2012-pet scan done with 2 areas of concern after breast cancer dx....Had biopsy and bone scan that were both neg...All cancer treatment done and #2 pet showed same areas-no change..Why bone scan?

Dr. Liawaty Ho Dr. Ho
5 doctors agreed:
Oct 2012-pet scan done with 2 areas of concern after breast cancer dx....Had biopsy and bone scan that were both neg...All cancer treatment done  and #2 pet showed same areas-no change..Why bone scan?

D/w your MD: The best person to answer your question is your doctor. Have a discussion with your doctor and see what the reason is. Most likely is the same reason your doctor did the bone scan last time- to ensure that this is also unchanged on the bone scan. Unlike the bone scan, the pet scan was not done dedicated only to check the bone. What is your cancer marker, alkaline phosphatase level? D/w your md. ...Read more

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Mcrc patient. Cea before chemo was 65, after round 1-80, after round 2-55, after round 3-40 But ct scan shows increase in size in liver lesions ? Can this happen ?

Mcrc patient. Cea before chemo was 65, after round 1-80, after round 2-55, after round 3-40
But ct scan shows increase in size in liver lesions ? Can this happen ?

Yes: The CEA level is not always reliable in judging whether therapy for colorectal cancer is successful or not. It is just one tool, just as the scans are. You should rely on the judgment of your oncologist as to how your therapy is doing for you. Good luck. ...Read more

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Is Full body PET scan or CT scan better for diagnosing Lymphoma? Which uses less radiation?

Is Full body PET scan or CT scan better for diagnosing Lymphoma? Which uses less radiation?

Both: The actual diagnosis of lymphoma requires tissue, usually excisional biopsy of an entire lymph node. Staging to see where other sites of disease could be is done with a combined PET/CT. The staging used to matter more many years ago when they would often give XRT or do surgery, it doesn't matter as much as it used to because almost everybody gets systemic chemotherapy for both Hodkins and non H ...Read more

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How do pet scans, mri, ct, and bone/gallium scans differ?

How do pet scans, mri, ct, and bone/gallium scans differ?

Different mechanisms: Mri uses magnetic radiation( no x-ray) for anatomic localization and characterization of different parts of body, water and fat constitution of different tissues.Ct uses x-ray to characterize anatomy of body, better for bone than mr.Pet, bone, gallium scans use radio tracers intravenously.Petglucose metabolism of tumors, gallium (infection/tumor), bone scan for fxs, tumors, infection bone metabolism. ...Read more

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Are suv on pet scan gamma?

Are suv on pet scan gamma?

SUV...: Suv stands for standardized uptake value. It is used for semi-quantitative analysis on pet scan. It tells the amount of glucose uptake or hypermetabolism of a tumor. ...Read more

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Post op seminoma, in r testicle. Pet scan done for suspecious nodes. Pet scan result shows negative for any abnormalility. This means no seminoma?

Post op seminoma, in r testicle.  Pet scan done for suspecious nodes. Pet scan result shows negative for any abnormalility. This means no seminoma?

Surveillance: A negative pet scan means there is no accumulation of cancer cells large enough to be discernible by the pet scanner. There is a resolution limit of about 7mm in size to be seen, some are better now. I am not trying to scare you, but your doctor i'm sure will continue to caution you and continue surveillance for a period of time safe to say you are cancer-free. ...Read more

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Had surgery for colon cancer no chemo, after 4 months CT scan showed spot on liver. Could it be cancer?

Had surgery for colon cancer no chemo, after 4 months  CT scan showed spot on liver. Could it be cancer?

Possible: Depending on what stage your colon cancer was originally the risk of developing disease in the liver or elsewhere is variable. Colon cancer, when it spreads through the blood, does commonly go to the liver, however if only a small area and a single or small couple of lesions it can still be cured. Additional tests may help to further characterize this to help u decide if u need to treat it ornot. ...Read more

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Can CT and pet scan performed 2 weeks after skin and nipple sparing mastectomy with inplant also include chemotherapy ?

Can CT and pet scan performed 2 weeks after skin and nipple sparing mastectomy with inplant also include chemotherapy ?

PET scan...: Pet / ct scan can be performed at any time but it is extremely important for the physician interpreting the scan to know if you are having or have had chemotherapy or radiation therapy and exactly when. Also, it is important to know exactly when surgery was performed since recent surgery can cause false positive FDG uptake. Usually it is good to wait at least 4 weeks after chemotherapy. ...Read more

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My pet scan was highly suspicious for malignancy in rt lung.Now onto Bronchoscope so didn't pet confirm cancer?This cancer isn't curable!

PET scan helps but n: A PET scan can show an abnormality where body cells are overactive. This happens commonly with Cancer and with any Infection or inflammation. So a biopsy is required to make the distinction between Inflammation and Cancer. A bronchoscopy may show the tumor or it may be used to get a biopsy by getting near to the tumor ...Read more

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Had a pet scan for breast cancer, showed fluid on the lung ?

Had a pet scan for breast cancer, showed fluid on the lung ?

Yes it can show: Pet scan also will have superimposed very high resolution ct scan images will show, now need additional test to find out the nature of fluid. ...Read more

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Which test exposes patients to more radiation? Is it PET scan or CT scan?

Which test exposes patients to more radiation? Is it PET scan or CT scan?

It depends: on the technical parameters of the scans, particularly the CT scan. The exposure from the CT scan could potentially be more, about the same, or lass than a PET scan. ...Read more

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Which modality is better for detecting or confirming metastasis pet scan or bone scan? !

Which modality is better for detecting or confirming metastasis pet scan or bone scan? !

Depends on cancer: Each cancer type has an optimum way to image it, especially with techniques that image physiology, like pet and bone scan, as opposed to techniques that image anatomy, like ct and mri. Pet is best for cancers that use a lot of glucose as an energy source, like lung cancer. Bone scans are best for cancers that disrupt bone, like prostate cancer. ...Read more

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Can colon cancer spread to a aortocaval node ? This was note few months after surgery by a pet scan .

Can colon cancer spread to a aortocaval node ? This was note few months after surgery by a pet scan .

Yes: Colon cancer can indeed spread to that lymph node, as well as to others. Also, PET scans can give false positive results. Confer with your doctor. ...Read more

Dr. Devon Webster
976 doctors shared insights

Chemotherapy (Definition)

The term chemotherapy typically is used to describe using chemicals to treat ...Read more