Image collation device and patient positioning device using the same

摘要

The present invention provides an image collation apparatus with high collation accuracy and a patient positioning apparatus using the same by automatically converging to an optimal solution while avoiding falling into a local solution in automatic positioning calculation using the ICP method. Is an issue. The image collating apparatus according to the present invention includes a CT image data reading unit 17 that reads first and second CT image data, and binarization processing and edge processing for slice image groups of the first and second CT image data. A point group data generation unit 18 that performs extraction processing and generates first and second point group data in a three-dimensional space, and a point group data resolution conversion unit that thins out the point group data so as to widen the array pitch of the point group data 19 and conversion to the second point cloud data using the ICP method so that the error function between the first point cloud data and the second point cloud data output from the point cloud data resolution conversion unit is minimized. And an ICP calculation unit 22 for obtaining the quantity.