Influence of deleting fewer monitor units and small area segments in step and shoot IMRT in view of planning

Abstract

The Objective of the study is to observe the nature of the Radiotherapy patient Treatment plan quality when fewer segments are deleted. Its known fact that the IMRT planning consists of numerous segments in various gantry angles. These segments are created in inverse planning module. Depending upon the seriousness of the plan, the segment number increases. In doing so the TPS system generates many smaller segments of area even 1 cm X 1 cm or 2 cm x 2 cm with smaller Monitor Units. This not only increases patient overall treatment duration but also adds wear and tear of Linear accelerator machine by multi leave in and out movement. So, this study will investigate the influences of deleting the fever MU segments in Patient planning via dose volume histogram analysis and Organs dose coverage point of view. The results and discussion are given in detail.