公开(公告)号：US20230087238A1

公开(公告)日：2023-03-23

申请号：US17759585

申请日：2021-01-29

Applicant: Elekta Limited

Inventor： Martin Broad ,  Ralf SPRIESTERSBACH ,  Christopher Knox

IPC: A61N5/10

Abstract: A computer-implemented method for calibrating a multi-leaf collimator of a radiotherapy device. The multi-leaf collimator comprises a plurality of leaves, each leaf comprising an imaging marker, wherein the radiotherapy device includes an imaging device configured to image the leaves. The method comprises: receiving, from the imaging device, an image of the multi-leaf collimator in a calibration position, wherein in the calibration position the tips of the leaves abut an edge of a rigid calibration block, the edge having a known calibration profile; calculating for each leaf, from the calibration profile and the location of the marker in the image, a minor offset of the marker relative to a reference point; and outputting calibration values based on the calculated minor offsets, wherein at least one leaf of the multi-leaf collimator is controlled based on the calibration values.