試題詳解

30.有一 6 MV 射束，於 SSD =100 cm，深度 8 cm 下，照野 15 × 15 cm²，PDD (8, 15 × 15, 100) =76.53，S_p(15.23 ×15.23) =1.011，S_p(16.2 × 16.2) = 1.013，則 TMR (8, 16.2 × 16.2)數值為何？
(A)0.586
(B)0.767
(C)0.864
(D)0.923