Patent ID: 9474493
Filing Date: 2016-10-25
CPC Classification: A61B,A61N,G06T,G16H

Claim Text:
1. A method for treating a patient with a brachytherapy treatment according to an intended treatment plan, using a radiation source suitable for brachytherapy, comprising the steps of: arranging markers at known three-dimensional (3D) positions in a detection reference system between a two dimensional radiation detector configured to acquire images generated by radiation emitted by said radiation source and an area where said radiation source is positioned inside a patient during said brachytherapy treatment; determining positions of projections of at least one marker on an image when said radiation source is at a treatment position in an intended treatment plan reference system; calculating a plurality of calculated lines in the detection reference system, each line being defined by a 3D position of a marker and a 3D position of a corresponding projection of the marker on the detector according to the image; inferring during said brachytherapy treatment a 3D position of said radiation source in the detection reference system based on selected pairs of lines among said plurality of calculated lines, using midpoints of shortest segment between lines in said selected pairs; and if no correspondence between the detection reference system and the intended treatment plan reference system is available, matching inferred 3D position with the treatment position to extract the correspondence between the detection reference system and the intended treatment plan reference system; and if the correspondence between the detection reference system and the intended treatment plan reference system is available, comparing the inferred 3D position with the treatment position.