2008 ACMP Meeting ‐ Young Investigators' Symposium Abstracts

we used a commercial radiation treatment planning system (Pinnacle, Philips Medical Systems, Andover, MA) to plan on a respiratory motion phantom. Eight plans were developed on 8 phases of the tumor cycle. The optimized dose distribution from one phase was then used in (1) to compute the 4D dose distribution for a planar film assumed to move with the tumor center. A weighted average of all the plans constituted the multi-phase dynamic dose. The plan was delivered on a linear accelerator and measurements were made using radiochromic film.