IMRT

“For prostate and HT, there CAN be a significant dosimetric effect in the cranio-caudal direction because table speed and tumor motion are of the same magnitude.” However....

#fx

Impact (dose)

Movement

1/3

<3mm

5%

2/3

<5mm

10%

Correction schemes not feasible!We don’t know when (which fraction and tiing in the fraction) to interrupt an correct