15.下列何者可用來計算光子射束在照野不同時之機頭散射差異?
(A)percent depth dose
(B)tissue phantom ratio
(C)collimator scatter factor
(D)phantom scatter factor
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統計: A(55), B(40), C(1645), D(199), E(0) #3065020
統計: A(55), B(40), C(1645), D(199), E(0) #3065020