Basic Treatment Planning

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How to read a dose volume constraint

OAR

Dmax

Constraint

Rectum Bladder Femoral Heads

V65<25% V75<25%

V60<35% V70<35%

V75<15% V65<50%

V50<50%

<50 Gy

Example: V65<25% means that 25% volume of the rectum should not receive a dose of more than 65 Gray