問題詳情

54.高能光子平行對照技術中,有關組織的側邊效應(tissue lateral effect)的敘述,下列何者正確?
(A)光子射束能量越高,tissue lateral effect 越明顯
(B)因為 tissue lateral effect 的影響,造成病人照野外劑量增加
(C)病人體厚越厚,tissue lateral effect 越明顯
(D)射束入射位置安排越接近腫瘤,tissue lateral effect 的影響越大

參考答案

答案:C
難度:計算中-1
書單:沒有書單,新增

用户評論

daily taste】評論

放射治療物理學(KHAN's The P☆☆☆☆☆☆ ...

Matt】評論

Khan's the physics of radiation therapy P180This phenomenon has been called the edge effect, or the tissue lateral damage. The problem becomes more severe when larger thicknesses (e.g., ≥20 cm) are treated with one field per day using a lower-energy beam (e.g., ≤6 MV)A. 當體厚較大的病患,>20cm,建議使用高能量>6MV以上,故Energy高,tissue lateral effect越不明顯B. tissue lateral effect是談論生物效應的嚴重性C.正確D.射束入射位置越接近腫瘤,此時類似體厚較薄,故tissue lateral effect影響越小