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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Pet Scan
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it depends on what it is doing. there are many things that have
a scanning process system. you could be scanning pictures, or maybe
your computer is having a scanning process that is scanning your
computer for viruses.
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FDG- PET scanning is a technique that can provide information about brain metabolism. Another technique for such imaging is SPECT.