METHOD AND DEVICE FOR FAST RASTER BEAM SCANNING IN INTENSITY-MODULATED ION BEAM THERAPY

摘要

A method and device are designed to deliver intensity-modulated ion beam therapy radiation doses closely conforming to tumors of arbitrary shape, via a series of two-dimensional (2-D) continuous raster scans of a pencil beam, wherein each scan takes no more than about 100 milliseconds to complete. The device includes a fast scanning nozzle for the exit of an ion beam delivery gantry. The fast scanning nozzle has a fast combined-function X-Y steering magnet, and is coupled to a rastering control system capable of adjusting the length of each scan line, continuously varying the beam intensity along each scan line, and executing multiple rescans of a tumor depth layer within a single patient breathing cycle. An in-beam absolute dose and dose profile monitoring system is capable of millimeter-scale position resolution and millisecond-scale feedback to the control system to ensure the safety and efficacy of the treatment implementation.

主权项

1. A method for irradiating a target volume with a charged particle pencil beam, the method comprising:
continuously scanning the pencil beam of charged particles over a two-dimensional (2-D) raster scan pattern; applying length-variation for each scan line to conform to the 2-D raster scan pattern at a given depth; applying pencil-beam-intensity variation along each scan line; and completing multiple pencil beam scans of the 2-D raster scan pattern for each target depth layer of the target volume.