This invention being the configuration which possesses compensating filter 5, presumes radiation simply and accurately, directly the x-ray transparent image designates that the radiograph device which can acquire the p whose contrast is satisfactory or fault image is offered as purpose. This invention has direct radiation which directly from the dose of the radiation which incidence is done and directly the dose of the radiation which radiation is done directly calculates the decrease factor of radiation from suffering inspection body M decrease factor acquisition section 12 for suffering inspection body M. This invention is the proportion which is decreased by the fact that the primary indirect radiation which it occurs with compensating filter 5 passes suffering inspection body M, direct radiation decrease factor is calculated as primary indirect belt decrease factor is equal to direct radiation decrease factor. By making this way, the former way operation in a complicated way with, x-ray transparent image the X-rays equipment 1 whose acquisition of the p or fault image is simple or it can offer X-rays equipment 37.本発明は、補償フィルタ5を有する構成であっても、簡便かつ正確に直接放射線を推定し、コントラストが良好なX線透視画像pまたは断層画像が取得できる放射線撮影装置を提供することを目的とする。本発明は、被検体Mに入射する直接放射線の線量と、被検体Mから出射する直接放射線の線量とから直接放射線の減弱率を求める直接線減弱率取得部12を備えている。本発明は、補償フィルタ5で生じた1次間接放射線が被検体Mを通過することで減少する割合である、1次間接線減弱率が直接線減弱率と等しいものとして直接線減弱率を求める。この様にすることにより、従来のように複雑な演算を行わずによりX線透視画像pまたは断層画像の取得が簡便なX線撮影装置1またはX線撮影装置37が提供できる。
