Projection method of 3D ray tracing,申请号US201314027631-传众专利搜索

Projection method of 3D ray tracing

申请公布号：US9259193(B2)

申请号：US201314027631

申请日期：2013.09.16

申请公布日期：2016.02.16

申请人：

INSTITUTE OF NUCLEAR ENERGY RESEARCH ATOMIC ENERGY COUNCIL, EXECUTIVE YUAN

发明人：Tseng Fan-Pin;Tsai Tien-Hsiu;Jan Meei-Ling

分类号：G06K9/00;A61B6/03;G06T15/06;A61B6/00;H05G1/70

主分类号：G06K9/00

代理机构：

WPAT, PC

代理人：WPAT, PC ;King Justin

地址：Taoyuan County TW

摘要：The present invention provides a projection method of 3D ray tracing, so as to construct a geometric factor required for the reconstruction of a medical image in the imaging field. The present invention mainly projects a radiation field and a voxel detected by each detector on two 2D planes, then calculates the geometric ratio of a rectangular unit, corresponding to each voxel on the two 2D planes, to the radiation field, respectively, and multiplies the geometric ratios to obtain a sub-geometric factor with respect to the voxel. The sub-geometric factors gij of all voxels i corresponding to all detectors j are combined to form a geometric factor matrix Gij.

主权项：1. A projection method of 3D ray tracing, comprising the following steps: providing an emission source to generate a radiation field to be projected to a detection module, the detection module having a plurality of detectors j arranged in an array; defining a 3D space formed by a first axis, a second axis, and a third axis between the emission source and the plurality of detectors arranged in an array, the 3D space having a plurality of voxels i stacked to form a three-dimensional space array, the emission source being set in the direction of the third axis, and a sensing plane of the plurality of detectors corresponding to a first plane defined by the first axis and the second axis, so as to sense the radiation field; defining that a sub-radiation field exists between each detector that senses the radiation field and the emission source; providing a computational processing unit for deduction, so as to obtain a sub-geometric factor gij corresponding to each voxel i of each detector j in a corresponding sub-radiation field, the deduction further comprising the following steps: projecting the sub-radiation field corresponding to each detector and the plurality of voxels on a second plane formed by the first axis and the third axis and on a third plane formed by the second axis and the third axis, respectively, so that each detector has a corresponding plane radiation field and an adjacent plurality rows of one-dimensional rectangular array arranged into a 2D plane on the second plane and the third plane, respectively, each row of one-dimensional rectangular array having a plurality of rectangular units arranged adjacent to each other, and each voxel corresponding to one rectangular unit on the second plane and corresponding to one rectangular unit on the third plane; computing a geometric ratio of each rectangular unit inside an area covered by each row of one-dimensional rectangular array of the plane radiation field corresponding to each detector on the second plane and the third plane, respectively; and multiplying the geometric ratios of the rectangular units corresponding to each other on the second plane and the third plane to obtain the sub-geometric factor gij of the voxel corresponding to each detector; and combining the sub-geometric factors gij of all detectors j with respect to all voxels i to form a geometric factor matrix Gij.