Ramer · Alavi Nuclear Medicine Technology

8 Cardiovascular System Scintigraphy 8146) During a one day myocardial perfusion study with 99m Tcsestamibi including both stress and rest:a. rest images must be obtained before stress imagesb. the second dose of sestamibi should be higher thanthe firstc. the higher dose of sestamibi is always injected forthe stress portiond. the sestamibi doses should be identical for bestcomparison of stress and rest47) Why is it necessary to inject two doses of 99m Tc sestamibifor a myocardial perfusion study including both stressand rest conditions?a. because the physical half life of 99m Tc is too shortto obtain both image sets from one injectionb. because there is no redistribution of 99m Tc sestamibiwithin the myocardiumc. because the effective half life is too shortd. because sestamibi is not retained by the myocardiumfor a sufficient time48) Soft tissue attenuation is less problematic in:a. SPECT myocardial imaging with 99m Tc sestamibithan with planar imaging with 99m Tc sestamibib. SPECT myocardial imaging with 201 Tl chloridethan with planar imaging with 201 Tl chloridec. myocardial imaging with 201 Tl chloride thanwith 99m Tc sestamibid. myocardial imaging with 99m Tc sestamibi thanwith 201 Tl chloride49) The bulls eye display created after myocardial perfusionimaging represents:a. only short axis imagesb. an entire set of stress or rest SPECT imagesc. all part of the myocardial wall except the apexd. none of the abovee. b and c