PROBLEM TO BE SOLVED: To provide a measuring instrument for evaluating the capacity of radiation image diagnosing equipment for attaining the objective and uniform evaluation of the capacity of the radiation image diagnosing equipment.SOLUTION: An object 3 to be measured is arranged to the front of the body of the measuring instrument and parts 51, 52, ..., 58 to be measured used in the evaluation of the capacity of a mamma X-ray photographing apparatus by imaging the object 3 to be measured by the irradiation with radiation are arranged inside the outer peripheral edge of the object 3 to be measured. First reference points 61 and 62 used as reference positions in the horizontal direction of the body when the body is arranged to the mamma X-ray photographing apparatus are provided to the object 3 to be measured and, separate from the first reference points 61 and 62, second reference points 91, 92, ..., 96 used as the reference positions in the horizontal direction of the parts 51, 52, ..., 58 are provided.COPYRIGHT: (C)2013,JPO&INPIT【課題】客観的かつ画一的な放射線画像診断装置の性能評価を実現させる放射線画像診断装置の性能評価用測定器具を提供する。【解決手段】測定器具の本体の正面には被測定体3が配設され、被測定体3の外周縁の内側には、放射線の照射により撮像されることで乳房X線撮影装置の性能評価に用いられる被測定部51,52,・・・,58が配設され、被測定体3には、本体が乳房X線撮影装置に配設された際の本体の水平方向の基準位置として用いられる第一の基準点61,62が設けられると共に、第一の基準点61,62とは別に、被測定部51,52,・・・,58の水平方向の基準位置として用いられる第二の基準点91,92,・・・,96が設けられている。【選択図】図1
