PROBLEM TO BE SOLVED: To execute computer tomography with higher spatial resolution in the slice direction (the direction z) while restricting the exposure of a subject, using a multi-slice type X-ray computer tomography apparatus.SOLUTION: The rotary part of a scanning gantry is rotated around the subject to collect the projection data for a prescribed angle range, i.e., &pi+(fan angle) to 2&pi+(fan angle). During the data collection, the scanning gantry is moved relative to the subject by a very small distance D equivalent to the width d of one detector row of X-ray detector.COPYRIGHT: (C)2010,JPO&INPIT【課題】 マルチスライス型のX線CT装置を用いて、被検体の被曝を抑えつつ、スライス方向(z方向)の空間分解能が高い撮影を行う。【解決手段】 走査ガントリの回転部を被検体の周りに回転させてπ+ファン角~2π+ファン角の所定ビュー角度分の投影データを収集するスキャンであって、その収集の間に、回転部をX線検出器の1検出器列の幅dと同程度の微小距離Dだけ被検体に対して相対移動させるスキャンを行う。【選択図】 図4
