What does low activity on a PET scan mean?

Cells in the body metabolize this sugar for energy, so high concentrations of FDG seen on PET indicate areas of high metabolic activity (as in cancer). Areas of low or no metabolic activity can indicate areas of reduced blood flow or blockages due to stroke or heart attacks.

Will colon cancer show up on a PET scan?

PET Scan More Effective than CT Scan in Detecting Colon Cancer Spread. According to results recently presented at the 2003 American Roentgen Ray Society Annual Meeting, a PET scan is significantly more accurate at detecting colon cancer metastasis than a CT scan.

What does active mean on a PET scan?

The cells, or activity, will show up as “hot spots” or “cold spots.” Active areas are bright on a PET scan. They are known as “hot spots.” Where cells need less energy, the areas will be less bright. These are “cold spots.”

Will a PET scan show colon polyps?

These investigators found that PET/CTC was a feasible technique allowing excellent image correlation in polyps measuring greater than 10 mm and showing promise in accurate anatomic correlation of both malignant and premalignant lesions of the colon.

Does inflammation show up on PET scan?

PET scans light up areas of high metabolic activity that are not necessarily cancer, including areas of inflammation, infection, trauma, or recent surgery.

Is a PET scan as good as a colonoscopy?

Fifty eight patients had false negative PET scans but colonoscopy revealed true pre-malignant and malignant pathology, yielding 23% sensitivity. The specificity, negative predictive value (NPV) and accuracy were 96%, 90% and 87%, respectively.

Do you need a colonoscopy if you had a PET scan?

In agreement with previous studies [25], [32], we recommend colonoscopy for further confirmation in subjects with positive results on FDG PET/CT scans.

Why are PET/CT scans used in the evaluation of colon cancer?

The fusion of PET and CT images allows an accurate localization of the lesions. PET/CT is a useful tool to differentiate pathologic from physiologic FDG uptake. Presence of a focal colonic FDG uptake incidental finding on a PET/CT scan justifies a colonoscopy to detect (pre-)malignant lesions.

Does FDG colonic activity show up on PET/CT?

Focal 18F-fluorodeoxyglucose (FDG) colonic activity can be incidentally seen in positron emission tomography/computed tomography (PET/CT) scans. Its clinical significance is still unclear.

Can FDG PET detect adenomatous polyps in colon cancer?

Because of 18F FDG accumulation in adenomatous polyps, PET using FDG can detect early premalignant colorectal lesions. Materials and methods: FDG PET/CT studies performed for a 1-year period in 1,716 consecutive patients with various malignant diseases, except colorectal cancer, were retrospectively reviewed.

What is Petpet–computed tomography (CT) used for in colonoscopy?

PET–computed tomography (CT) can be useful in localizing and characterizing foci of increased FDG uptake within the bowel.