12.CT掃描長度是50 cm,劑量長度的乘積(dose-length product)是600 mGy-cm,CTDIvol是多少mGy?
(A)24
(B)12
(C)6
(D)3
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統計: A(19), B(2471), C(28), D(53), E(0) #2183146
統計: A(19), B(2471), C(28), D(53), E(0) #2183146