PROBLEM TO BE SOLVED: To provide an X-ray CT imaging apparatus capable of acquiring images desired by a user in reconstructing an image acquired from the CT apparatus without requiring complicated processing.SOLUTION: The CT imaging apparatus includes: an X-ray irradiation section for irradiating a subject with an X-ray an X-ray detecting section for outputting the digital amount of electric signals corresponding to the incident X-ray at a constant frame rate a turning means for moving the pair of the X-ray irradiation section and the X-ray detecting section around the subject so that they are opposed to each other with the subject interposed a storage means for sequentially storing, as projected image data, image signals to be output by the detecting means when the turning means moves the X-ray irradiation section and the X-ray detecting section around the subject and an image processing means for acquiring image reconstruction computation on the basis of the projected image data stored in the storage means. The image processing means includes processing of creating a filter consisting of the product of a predetermined filter function and a reduction continuous function having an inflection point in an interruption frequency, and computing the projected image data by the created filter.COPYRIGHT: (C)2013,JPO&INPIT【課題】 処理を複雑化することなく、CT装置から得られた画像を再構成する際に、ユーザの好む画像を得られるようにする。【解決手段】 被検者にX線を照射するX線照射部と、入射するX線に応じたデジタル量の電気信号を一定のフレームレートで出力するX線検出部と、前記X線照射部と前記X線検出部の対を、被検者を挟んで互いに対向させた状態で被検者の周りを移動させる旋回手段と、前記旋回手段が前記X線照射部及び前記X線検出部を被検者の周りを移動させることに伴って前記検出部が出力する画像信号を投影画像データとして順次記憶する記憶手段と、前記記憶手段に記憶された投影画像データに基づいて画像再構成演算を得る画像処理手段と、を備え、前記画像処理手段は、所定のフィルタ関数と遮断周波数に変曲点を有する減少連続関数との積からなるフィルタを作成し、前記投影画像データを前記作成したフィルタで演算する処理を含んでいる。【選択図】 図17
