Nuclear Medicine Instrumentation Questions And Answers 100% Verified A+ Guaranteed

In addition to spatial resolution, what other parameters of the detection system can be assessed with either a bar or orthogonal hole phantom? A. sensitivity B. uniformity C. spatial linearity D. geometric variation {Ans: C. Spatial linearity Spatial linearity can be assessed by evaluating the "straightness" of parallel bars or parallel rows of holes.}The basic function of all collimators is to: A. increase the resolution of the instruments B. Increase the efficiency of the instruments C. Limit scattered radiation D. Limit access of photons to the instrument {Ans: D. Limit access of photons to the instrument Absorptive collimation allows only a fraction of the gamma rays striking the collimator to actually pass through the detector}The amount of light generated by a sodium iodide crystal is directly related to the: A. photon energy absorbed in the crystal B. Diameter of the crystal C. Thickness of the crystal D. Age of the crystal {Ans: A. photon energy absorbed in the crystal A NaI (Tl) scintillation detector provides an output signal from the photo-multiplier tube that is proportional in amplitude to the amount of energy absorbed in the crystal}When one increases the resolution of a collimator, its efficiency: A. Increases