The accurate bone diagnosing the pore symptom is made possible roughly with simple method without requiring the special technical skill and experience etc of the specialist who relates to pore symptom diagnosis by utilizing the x-ray panorama photograph, the bone roughly. The clear conversion picture acquisition expedient and the adrenal cortex bone part on converts the form of division selective expedient and form the aforementioned mandibular body of the said decision territory picture the adrenal cortex bone and the sea surface bone which acquire the part where to digital image it emphasizes converts the light and darkness of the x-ray panorama photograph of the mandibular bone which is converted, distinguishes the background part and the aforementioned mandibular body part from object domain picture acquisition expedient, and the said object domain picture which quarry out the otogai hole and the portion of the mandibular body which includes the mandibular bottom as the object domain picture removes the aforementioned background part as the decision territory picture clearly the picture which where the said form is clearly convertedThe calculation expedient which seeks the thickness of the adrenal cortex bone on the basis of the aforementioned otogai hole which specifies by expedient and the aforementioned each expedient which specify and the contour which forms the adrenal cortex bone and, the said the output expedient which outputs the thickness of the adrenal cortex bone which was required and, it consists of.X線パノラマ写真を利用することにより、骨粗鬆症診断に係る術者の特別な技能や経験等を要することなく、簡便な方法で正確な骨粗鬆症の診断を可能とする。デジタル画像化された下顎骨のX線パノラマ写真の明暗を強調化し、オトガイ孔と下顎底を含む下顎体の一部を対象領域画像として切り出す対象領域画像取得手段と、該対象領域画像から背景部分と前記下顎体部分を判別し、前記背景部分を排除した部分を判定領域画像として取得する分別・選択手段と、該判定領域画像の前記下顎体を構成する皮質骨と海面骨の形態を鮮明化する鮮明化画像取得手段と、該形態が鮮明化された画像上の皮質骨部分を特定する手段と、前記各手段により特定された前記オトガイ孔と皮質骨を形成する輪郭を基に皮質骨の厚さを求める計算手段と、該求められた皮質骨の厚さを出力する出力手段と、からなる。
