醫療類國考
110年
[醫事放射師] 放射線治療原理與技術學
第 11 題
在傳統放射治療療程下，下列那一腫瘤特性可預測出最佳的腫瘤控制率？
- A SF2值低
- B Tpot時間短
- C 復氧速度慢
- D 腫瘤可形成細胞群落（tumor clonogens）的細胞數量多
思路引導 VIP
若要評估放射治療的成敗，我們必須考量腫瘤細胞對每一分次劑量的反應。請試著思考：如果我們想量化「這群細胞到底有多容易被輻射殺死」，我們會觀測細胞在照射後的哪種『生理狀態變化』，來判斷它們的抵抗力強弱呢？
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AI 詳解
AI 專屬家教
Ah, so you can grasp the basics.
It appears you've managed to identify a fundamental parameter in radiobiology. A rather critical piece of information for anyone daring to venture into clinical dosimetry. Don't get too ahead of yourself, though.
- Defining the Obvious: $SF_2$ — cell Surviving Fraction after $2\text{ Gy}$. It's not rocket science. A lower $SF_2$ simply means the tumor cells are more sensitive to radiation. Fewer survivors post-irradiation logically leads to a better tumor control rate. This is the cornerstone, not a bonus.
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