| 摘要 |
A phantom is provided with: a reference marker at a predetermined position thereof; a positioning reference surface, to be placed into contact with a chest wall abutting surface of a support table of a mammography apparatus; and a pattern region for measuring distances from the reference surface, perpendicular to the reference surface. The amount of transmitted radiation changes within the pattern region in a direction perpendicular to the reference surface according to a predetermined rule. The phantom is placed on the support table to measure the amount of chest wall loss.
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