No you cannot smoke before a PET scan because it will alter the results and it will be detecting in you system which may cause problems with the scanning process.
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A full body PET scan can take 30 to 45 minutes. A scan of a single lamp or a single organ can take as little as 10 minutes.
He'll yes.
A PET scan can have a negative effect on a kidney. If dye is used, this can cause a problem for some people. It is also good for detecting illness, though.
A PET scan can reveal the presence of a mass, but it is also good to have a sample of cells from the suspected area to look for changes in the nucleus to ascertain whether pre-cancerous changes are taking place. Hence, the biopsy under CT guidance.