PROBLEM TO BE SOLVED: To allow spatial resolution to be changed over with simple configuration, in radiation tomography.SOLUTION: There is provided a radiation tomographic apparatus including on a detection side of a radiation detector, a plurality of collimator plates which are arranged in a standing condition, in such a manner that a plurality of radiation detection elements are divided in a channel direction. The radiation tomographic apparatus includes: setting means which sets a position of a radiation focus of a radiation source, the position to be set when performing radiation tomography, and which switchably sets the position of the radiation focus of the radiation source, between a first position and a second position. In the first position, a channel-direction beam width of radiation which is generated from the radiation source and is incident on each radiation detection element through each opening formed by the collimator plates becomes relatively broad, and in the second position, the beam width becomes relatively narrow. The radiation tomographic apparatus further includes reconstruction means performing image reconstruction processing corresponding to the set position of the radiation focus.COPYRIGHT: (C)2014,JPO&INPIT【課題】放射線断層撮影において、簡単な構成で空間分解能の切換えを可能にする。【解決手段】放射線検出器の検出側において、複数の放射線検出素子をチャネル方向に区分するように立設された複数のコリメータ板を備えた放射線断層撮影装置において、放射線断層撮影を行う際における放射線源の放射線焦点の位置を設定する設定手段であって、放射線焦点から発生され、コリメータ板により形成される開口を通って、放射線検出素子に入射する放射線のチャネル方向のビーム幅が、相対的に広くなる第1の位置と、相対的に狭くなる第2の位置とに切換え可能に設定する設定手段と、設定された放射線焦点の位置に対応した画像再構成処理を行う再構成手段とを備えた構成とする。【選択図】図5
