A method for estimating the distribution of bone density of at least part of a human skeleton. The method includes generating a geometric representation of a portion of the skeleton, a three-dimensional geometric representation of at least a portion of a person's contour, first and second X-ray images, and software. Use to estimate a value for the thickness of the soft tissue through which the predetermined X-ray has passed, an attenuation coefficient of the soft tissue through which the predetermined X-ray has passed, and a value for the thickness of the bone tissue through which the predetermined X-ray has passed； Using the thickness value for the soft tissue that has passed through and the value for the attenuation of the predetermined X-ray caused by the thickness of the bone tissue that has passed, the software represents a bone density of the bone tissue through which the predetermined X-ray has passed Estimation. [Selection] Figure 1a人の骨格の少なくとも一部の骨密度の分布を推定する方法。この方法は、骨格の一部の幾何学的表現と、人の輪郭の少なくとも一部の三次元での幾何学的表現と、第１及び第２のＸ線画像を生成することと、ソフトウェアを使って、所定のＸ線が通過した軟組織の厚みに対する値と、通過した軟組織の減衰係数と、所定のＸ線が通過した骨組織の厚みに対する値と、を推定することと、所定のＸ線が通過した軟組織に対する厚みの値と、通過した骨組織の厚みに起因する所定のＸ線の減衰に対する値とを使用して、ソフトウェアは所定のＸ線が通過した骨組織の骨密度を表す値を推定することを含む。【選択図】図１ａ
