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❌ – a frail patient gets palliative, not definitive, regardless of stage.

| Question | Concise Answer | |----------|----------------| | "Why 1.8 Gy per fraction?" | Late-responding tissues (cord, kidney) have low α/β (~2-3). Smaller fractions spare them. | | "What is the 4R's of radiobiology?" | Repair (sublethal damage), Reassortment (cell cycle), Repopulation (accelerated after ~28 days), Reoxygenation. | | "When is a bolus used?" | To increase skin dose (e.g., scar recurrence, chest wall, nose). | | "What is the difference between IMRT and 3D-CRT?" | IMRT modulates beam intensity – better OAR sparing, more low-dose bath (second malignancy risk). | | "Can you re-irradiate?" | Yes, but only if: >6-12 months since prior RT, cumulative OAR constraints not exceeded, and using highly conformal technique (IMRT, proton, SBRT). | radoncquestions

: The site contains thousands of multiple-choice questions modeled after official board exams. ❌ – a frail patient gets palliative, not