Patent ID: 9259193
Filing Date: 2016-02-16
CPC Classification: A61B,G06T

Claim Text:
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 g 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 g combining the sub-geometric factors g