NMTCB Prep Questions and Answers Correct

NMTCB Prep Questions and Answers Correct What is being evaluated with chromatography testing of technetium radiopharmaceuticals? radiochemical purity The use of elliptical and/or body contour orbits in SPECT imaging should result in improved Spatial resolution Which of the following variables does not affect spatial resolution in nuclear medicine imaging systems? Byte vs. word acquisition mode Full width at half maximum (FWHM) is often used as a measure of: resolution Uncorrected flood field nonuniformities cause ________ artifacts in tomographic reconstruction circular (ring) How many 16 bit words of memory are required for a 64x64 byte mode image? 2,048 (64x64)/2 What are areas of prolonged retention of Xe-133 in the lungs associated with? Obstructive lung disease A patient is to undergo a multiple-gated cardiac blood pool study with the heart cycle divided in 20 frames. The patient is in normal sinus rhythm and has a heart rate of 68 bpm. The computer should lock in at what time per frame for this study? 44 milliseconds Which of the following myocardial perfusion patterns suggest that the patient has myocardial ischemia? Normal resting Tl-201, abnormal stress Tl-201 Ventricular depolarization occurs just before the ventricles contract, expelling blood forward into the pulmonary artery and aorta. What represents this action on the EKG strip? QRS complex At what distance is the exposure rate (in mR/hr) indicated by a package's transport index measured? 1 meter from the surface According to the NRC, an unrestricted area is one in which a person would receive a radiation dose of less than: 2 mrem/hr The dose rate during preparation of a radiopharmaceutical is 1.66 mrem/hr. With this rate reduced by 2 HVLs, how many hours would it take a worker to accumulate 10 mrems? 24 hours In a euthyroid patient, which of the following describes the result of Cytomel (T3) administration for 8 days prior to a radioactive iodine thyroid uptake? Decreased thyroid uptake A well counter is set to collect 10,000 counts or to stop after 5 minutes. The counter stops at 2 minutes. What is the count rate (in cpm)? 5,000 cpm If a vial containing Tl-201 is found to have an activity of 10.0 mCi at 8 am on Monday, how much activity would remain at 10 am on Friday provided no dose was drawn from this vial (in mCi)? 3.94 mCi High radiation area signs are to be posted in areas where exposures greater than ______ mrem/hr are measured at 30 cm from the source or from any surface through which the radiation penetrates: 100 When a zoom is used during a 64x64 byte mode computer acquisition: Spatial resolution is increased Which of the following quality control tests should be performed on a dose calibrator after a power outage? Constancy When processing a gated blood pool study, incorrectly placing the background region over part of the aorta will have what effect on the resulting EF calculation? The result will be higher than patient's true EF When labeling leukocytes with In-111 oxine, what is the next step in the procedure after blood has been drawn in a syringe containing an anticoagulant? Sediment the sample for 50-60 minutes The limit for Mo-99 contamination in a solution of Tc-99m is no more than: .15 microcuries Mo-99 per mCi of Tc-99m What is the most likely cause of activity seen in the liver and spleen during a perfusion lung scan? MAA particles smaller than 5 microns