اختبار: الأشعة البوزيتورنية

Which of the following radionuclides used in PET imaging produces the highest resolution images?

The elevated serum glucose level at the time of fluorodeoxyglucose (FDG) administration may decrease the sensitivity of the FDG-PET study. Althoguh intravenous bolus of insulin may effectively lower the serum glucose level, however induced hyperinsulinemia will:

The time from F-18 fluorodeoxyglucose (FDG) administration to the time of data acquisition has been shown to have a marked effect on FDG uptake. An increased interval between the injection and imaging uptake time will DECREASE radiotracer concentration in:

All of the following cellular mechanisms are responsible for malignant cells increased F-18 fluorodeoxyglucose accumulation EXCEPT:

F-18 is a cyclotron-produced radioisotope with a half-life approximately of:

The usefulness of F-18 FDG PET in infection imaging is based on the fact that granulocytes and macrophages in infectious foci:

All of the following scintigraphic methods are often used in the diagnosis of fever of unknown origin (FUO) EXCEPT:

The concentration of glucose-6-phosphatase, an enzyme mediating dephosphorylation of FDG-6-phosphate, is low in most tumors EXCEPT:

F-18 FDG uptake in tumors correlates with tumor:

The term “partial volume effect” is caused by the limited resolution of PET scanners and refers to phenomenon that make intensity values in images differ from what they ideally should be. The “hot” spot smaller than twice the resolution of the scanner will have total counts preserved and will appear: