PROBLEM TO BE SOLVED: To easily and correctly discriminate the contour of a soft tissue and the measurement point of a hard tissue, etc.SOLUTION: A radiographic device includes: a radiation irradiating means 30 for irradiating a subject O with radiation a radiation detecting means 31 for detecting the radiation transmitting the subject O a re-constitution processing means 55 for performing re-constitution processing of projection data of a projection image which is obtained by the radiation detecting means 31, and generating the image data of a tomographic image with respect to the subject a storage means 51 for storing threshold values for discriminating the selected hard tissue and soft tissue and a reference value for discriminating air a comparing means 54 for comparing the image data with the threshold values and the reference value and a post-working processing means 56 for replacing the image data determined as the soft tissue with the reference value, while leaving the image data determined as the hard tissue as it is, and replacing the image data determined as the air with a prescribed value.COPYRIGHT: (C)2009,JPO&INPIT【課題】軟組織の輪郭や硬組織の計測ポイント等を容易且つ正確に判別できる。【解決手段】被写体Oに対して放射線を照射する放射線照射手段30と、被写体Oを透過した放射線を検出する放射線検出手段31と、放射線検出手段31で取得した投影画像の投影データを再構成処理し、被写体に対する断層画像の画像データを生成する再構成処理手段55とを備え、選定した硬組織及び軟組織を判別する閾値と空気を判別する基準値とを記憶するための記憶手段51と、画像データと閾値及び基準値とを比較する比較手段54と、硬組織として判定した画像データをそのままにし、軟組織として判定した画像データを基準値に置換し、空気として判定した画像データを所定値に置換する後加工処理手段56とを備えた。【選択図】図2
