Patent ID: 8858414
Filing Date: 2014-10-14
Classification: A61N

Abstract:
1. A programmable method for setting subarcs in a segmented short-arc volumetric modulated arc therapy (VMAT) to fit a breath-hold interval, comprising the following steps: (a) dividing an arc in the VMAT into a certain number of subarcs; (b) setting four cut-edge control points within each subarc to form three segments, each segment defining a range over which a prescribed dose of radiation is delivered with the segments arranged in a continuous manner on the subarc and the delivery of the prescribed radiation dose being continuous through the segments; (c) setting monitor units (MUs) for the segments within each subarc, wherein the monitor units for a starting (first) control point, second control point, third control point and stopping (fourth) control point are designated as MU (d) determining a dose distribution within each subarc by setting delivered MUs in each segment, wherein the delivered MUs in a first segment are distributed according to a formula: MU X wherein each subarc is in an interval less than a single breath-hold.