PROBLEM TO BE SOLVED: To provide an equivalent phantom for defining the quality of an X-ray Talbot photographing device, and a quality evaluation method of an X-ray Talbot photographing device using the equivalent phantom.SOLUTION: In an equivalent phantom F to be used by an X-ray Talbot photographing device 1 including an X-ray source 11a, a plurality of grids 14, 15 and an X-ray detector 16 to photograph a moire image to be a base for generating a differential phase image of at least a subject, two kinds of substances f8, f9 are provided, the ratio n8/n9 of a reflective index of the two kinds of substances f8, f9 is equal to the ratio nc/nt of a reflective index between a soft tissue and its surrounding tissue, and at least a portion of a shape of one kind of the substance f8 between the two kinds of substances f8, f9 is formed so as to be equal to the shape of a portion corresponding to the soft tissue.COPYRIGHT: (C)2016,JPO&INPIT【課題】X線タルボ撮影装置の品質を定義するための等価ファントム、およびその等価ファントムを用いたX線タルボ撮影装置の品質評価方法を提供する。【解決手段】X線源11a、複数の格子14、15およびX線検出器16を備え、少なくとも被写体の微分位相画像を生成する基となるモアレ画像を撮影するX線タルボ撮影装置1に用いられる等価ファントムFにおいて、2種類の物質f8、f9を備え、当該2種類の物質f8、f9の屈折率の比n8/n9が、軟部組織とその周囲の組織との屈折率の比nc/ntに等しく、かつ、当該2種類の物質f8、f9のうちの1種類の物質f8の少なくとも一部の形状が、軟部組織の対応する部分の形状と等しくなるように形成されている。【選択図】図3
