77.承上題,若射源距離collimator 5 cm,其sensitivity的比較,下列何者最高?
(A)pinhole collimator
(B)converging collimator
(C)high resolution parallel hole collimator
(D)general purpose parallel hole collimator
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統計: A(34), B(250), C(14), D(46), E(0) #3492145
統計: A(34), B(250), C(14), D(46), E(0) #3492145