Radiotherapy & Nuclear Medicine · NEET PG Preparation Radiology
A 55-year-old male is diagnosed with localized carcinoma of the prostate and is planned for external beam radiotherapy. Which of the following is the…
Practice question from Radiotherapy & Nuclear Medicine (NEET PG Preparation Radiology), with the correct answer and a step-by-step solution.
medium · MCQ · Q-3B2CE4
A 55-year-old male is diagnosed with localized carcinoma of the prostate and is planned for external beam radiotherapy. Which of the following is the most important radiobiological advantage of using high-energy photon beams or particle beams compared to superficial X-rays?
- A.Higher surface dose
- B.Skin-sparing effect due to buildup regionCorrect answer
- C.Complete absence of exit dose
- D.Shorter overall treatment time
Solution
High-energy megavoltage photon beams exhibit the phenomenon of dose buildup, where the point of maximum dose (dmax) occurs beneath the skin surface. This results in a skin-sparing effect, which spares the superficial layers from severe radiation dermatitis while delivering a high dose to deeper seated tumors.
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