[2E01-04] Radiation Medicine 1

[2E01] Study On Comparison of In-Treatment MV and diagnosis kV CT Images For Precise and Safe X-ray Cancer Therapy

*Ming Cheng¹, Uesaka Mitsuru¹, Haga Akihiro², Ritu Bhusal Chhatkuli¹, Kazuyuki Demachi¹ (1. The University of Tokyo, 2. Hospital of The University of Tokyo)

Keywords:IGRT, IMRT, CBCT

During the IMRT treatment course, dose is delivered extremely conformal to the treatment volume while minimizing radiation damage to surrounding healthy tissues. In real-time dose delivery, a multi-leaf collimator (MLC) defines a relatively small exposed field according to the treatment volume. This means that, some points, and perhaps many points, are in the exposed field for only a sub-set of the arc. This leads to possible data incompleteness in an angular sense. The goal of this work is to investigate new opportunities for the reconstruction of truncated data sets, to enhance the anatomical information around the treatment volume and to minimize the radiation dose. We propose the combination of data of priori projections and in-treatment MV projections.