Investigation of the beam penumbra effect on prostate IMRT dose conformity and uniformity – beyond the abstract

Differences in accelerator/multi-leaf collimator geometry may have a significant effect on IMRT dose conformity and uniformity. The beam penumbra is affected by photon energy, source size and the distance from the collimator to the patient. This article investigates the beam penumbral effect on IMRT dose distributions based on 6 prostate IMRT cases originally planned with the Corvus inverse planning system.