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The PET scanner looks similar to an MRI scanner, but it is quiet and does not use magnets. The PET scanner detects and records the signals the radioactive tracers emit. The signals are then reassembled into computerized images. Most patients can expect their exam to last around one and a half to two hours.
Skull base–to–proximal thigh imaging generally is recommended to survey the body in the search for areas of abnormal 18 F-FDG accumulation for most tumor types. Such PET/CT scans typically are acquired from the external auditory meatus to the midthigh region.
20 Νοε 2009 · The Society of Nuclear Medicine recommends skull-base to proximal thigh imaging to survey the body and recommends vertex to toe PET/CT when the tumor may be in the extremities, e.g. melanoma (Delbeke 2006).
Torso imaging: Base of the skull to mid-thigh. Covers most of the relevant portions of the body in many oncological diseases (standard for both Europe and the US). If indicated, cranially extended torso imaging may also cover the brain in the same scan (from the top of the head to mid-thigh).
The scanner software then automatically realigns the table, and a spiral CT is performed of the area of interest (usually the base of the skull through the mid-thigh for most oncology studies), generating literally hundreds of transaxial images through the body.
Positron emission tomography, also called PET imaging or a PET scan, is a diagnostic examination that involves getting images of the body based on the detection of radiation from the emission of positrons. Positrons are tiny particles emitted from a radioactive substance administered to the patient.
mended. Patients are scanned from the skull base to clavicles with the arms down and then from the skull base to mid thighs with the arms up. The dedicated head and neck imag-ing protocol consists of 3D PET scans with 5 minutes for each bed position, a 30-cm FOV, and 256 × 256 matrix for improved resolu-
