Figure 5.

Anterior projection images from a PET scan of a patient undergoing staging of lymphoma. (a) The initial study was performed after the patient had eaten a candy bar 30 minutes prior to FDG injection. Note the extensive myocardial and muscle uptake due to high insulin levels. Diminished activity is seen in the brain and in tumor sites in the neck and chest (arrows). (b) A repeat study after the patient complied with routine fasting preparation shows more normal biodistribution of tracer and better visualization of tumor deposits (arrows).