PROBLEM TO BE SOLVED: To improve accuracy of a CT automatic exposure mechanism in a radiation tomography apparatus.SOLUTION: A radiation tomography apparatus includes: control means controlling a radiation tube and a radiation detector such that the radiation tomography apparatus performs a scout scan detecting transmitted radiation of a photographic subject by radiating radiation while relatively moving the radiation tube and the radiation detector in the body axis direction of the photographic subject while keeping the radiation tube and the radiation detector in a prescribed angle direction and collects projection data by a plurality of radiation tube voltages different from each other generation means generating projection data corresponding to a radiation tube voltage equal to a radiation tube voltage which is different from the plurality of radiation tube voltages and is used in an actual scan on the basis of the projection data by the plurality of radiation tube voltages and determination means determining a radiation tube current in the actual scan on the basis of the generated projection data.COPYRIGHT: (C)2015,JPO&INPIT【課題】放射線断層撮影装置におけるCT自動露出機構の精度向上を図る。【解決手段】放射線管および放射線検出器を一定角度方向に保ちつつ被写体の体軸方向に沿って相対移動させながら放射線を照射して前記被写体の透過放射線を検出するスカウトスキャンを行って、互いに異なる複数の放射線管電圧による投影データを収集するよう、前記放射線管および放射線検出器を制御する制御手段と、前記複数の放射線管電圧による投影データに基づいて、当該複数の放射線管電圧とは異なっており、本スキャンに用いる放射線管電圧と同一である放射線管電圧相当の投影データを生成する生成手段と、前記生成された投影データに基づいて本スキャンにおける放射線管電流を決定する決定手段とを備えた放射線断層撮影装置を提供する。【選択図】図6
