Sci—Thurs PM: Planning—03: The Effect of Small Cylindrical Air Cavities on Circumferential Dose Distributions Due to Small 6 MV Photon Fields

The purpose of this work is to evaluate the accuracy of our radiotherapy treatment planning system, Pinnacle3, for calculating the dose distribution around small cylindrically shaped air cavities irradiated by small 6 MV photon field segments. Measurements under these conditions carried out by various investigators have been of limited precision or non‐ideal geometry and have been confined in angular extent around the cavity circumference. In …