PROGRAMMABLE SEGMENTED VOLUMETRIC MODULATED ARC THERAPY FOR RESPIRATORY COORDINATION

摘要

The invention designs a segmented short-arc VMAT plan, modified from the original VMAT plan, to fit the breath-hold interval. The modified VMAT of the invention has the advantages of its applicability to different planning systems for variously long arcs and its preprogrammed arc segmentation for summated dose consistency. The present invention provides a method and a system for use in administering radiation therapy to patients using a radiotherapeutic apparatus with gantry rotation, and also meets the requirements for dose planning and accurate delivery, as well as coordinates patient's breath-hold level.

主权项

1. A method for use in administering radiation therapy to patients using a radiotherapeutic apparatus with gantry rotation, the method comprising:
obtaining an arc with configurable selections of control points and associated MUs (Monitor Unit) defined by a treatment plan; segmenting the arc into a plurality of subarcs according to individual need of a patient; setting a plurality of control points and their associated MUs within each of the subarcs to form a continuous sequence of segmentations arranged on each of the subarcs, wherein each of the subarcs starts on a control point or between two consecutive control points and ends on a control point or between two consecutive control points, with each of the segmentations defining a range over which a prescribed dose of radiation is delivered, and the delivery of the prescribed radiation dose being in a continuous manner throughout the segmentation on each of the subarcs; determining a plurality of weighted doses of radiation and delivered MUs in each of the segmentations, wherein the delivered MUs of each of control point is distributed to be delivered in two adjacent segmentations according to a proportional distribution rule; turning off the radiation beam when each of the subarcs ends and turning on the radiation beam again when its succeeding subarc starts if a succeeding subarc exists until the treatment is completed.