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Regarding collimators: a. For parallel hole collimators, the field of view and sensitivity do not change with distance b. Sensitivity is inversely proportional to the spatial resolution c. Convergent collimators result in an inverted image d. Divergent collimators allow the use of a small crystal to image a large field of view e. Spatial resolution improves by reducing the distance from the patient |
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Answer» a. True. b. True. c. False. Pinhole collimators, which are used to image superficial organs, e.g. the thyroid, result in an inverted and magnified image. Convergent collimators result in magnification of the image but do not invert it. d. True. This is especially useful in mobile cameras, where a small crystal can image a large field of view, e.g. the lungs. e. True. Other factors that improve spatial resolution include longer and narrower holes. |
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