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

When one increases the resolution of a collimator, its efficiency: A. Increases B. Decreases C. Remains the same {Ans: B. Decreases Resolution is always best with the source of activity as close to the collimator as possible}Of the following phantoms to assess spatial resolution, the only one that determines the resolution of all areas of the detector with one image is the phantom. A. Hine-Duley B. four-quadrant C. parallel-line equal-space (PLES) D. orthogonal holes {Ans: D. Orthogonal holes The orthogonal hole phantom consists of holes of equal diameter at right angles to each other that cover the entire surface of 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}Reasons why good energy resolution is a desirable characteristic for a Nal detector include: A. precise identification of gamma rays B. separation of gamma energies