"We must wound in order to treat. But will that wound heal?" A conversation with Robert Timmerman reframes what his OAR constraint tables were actually built to answer — and what it really means for physicists to weigh tumor coverage against the harm we cause getting there.

Every physicist learns to spare the urethra — but why? A 1 Gy increase in urethral dose measurably raises a patient's risk of long-term urinary toxicity, and the difference between a disciplined plan and a loose one can mean the difference between a smooth recovery and a urethral stricture. Here's what the data actually says about the number on your screen.