In dose irregularity method, the transmitted type fault image pickup data of the image pickup object which it is related using, the description above the emission radiation source which turns around the image pickup object which it is related (14) it is collected. It is decided on the basis of the attenuation which is decided the position or angular bottle which was collected before the emission radiation source between fault image pickup, the attenuation where radiation is presumed, the position or angular bottle which comes from this of the emission radiation source which turns (721 and 82) concerning, (701, 84 and 90) in. Although the fault image pickup data is collected in the position or angular bottle which comes from the aforementioned this it precedes, level of the radiation which is formed by the emission radiation source, is adjusted on the basis of the attenuation of the radiation which is presumed.線量変調方法において、関連する撮像対象の透過型断層撮像データが、前記関連する撮像対象のまわりを回る放射線源(14)を使って収集される。断層撮像の間、放射線の推定される減衰が、回転する放射線源のこれからくる位置または角度ビン(721、82)について、放射線源の以前に収集された位置または角度ビン(701、84、90)において決定された減衰に基づいて決定される。前記これからくる位置または角度ビンにおいて断層撮像データを収集するのに先立ち、放射線源によって生成される放射線のレベルが、推定された放射線の減衰に基づいて調整される。
