Patent ID: 7110487
Filing Date: 2006-09-19
Classification: A61B,G01N,G06T

Abstract:
1. An x-ray measuring apparatus comprising: an x-ray source for generating x-rays to be emitted to a subject; an x-ray detector which detects measurement data regarding said subject; a rotating device which changes a relative position of said x-ray source and said x-ray detector with respect to said subject; a processor which executes an arithmetic operation for said measurement data; and a detector shifting means for shifting said x-ray detector, wherein said x-ray detector which is a one-dimensional detector or a two-dimensional detector, is placed and shifted by a distance shorter than half of length of said x-ray detector along a line parallel to plane of rotation from front position of said x-ray source, in a tangential direction of the plane where said x-ray source rotates, and said processor executes a process for obtaining projection data by logarithmically converting said measurement data, a process for multiplying a value of said projection data by a weight, and a process for obtaining reconstructed data by executing a reconstructing process using said data after being multiplied by the weight, thereby obtaining a three-dimensional reconstructed image, and wherein, in said process for multiplying the weight, a rotation center line corresponding to axis of rotation is set on said measurement data, a distance from said rotation center line to an end of said measurement data is measured, and a boundary line is set in a position along a longer distance from the rotation center line being equidistant between said position and end of a shorter distance, and a weight from said boundary line to an end of the longer distance is set 1.0, a weight at said rotation center line is set 0.5, and a weight at the end of the shorter distance is set 0.0.