| 摘要 |
<p>A radiographic apparatus for breast examination is provided, the apparatus including a shielding plate that reliably shields radiation derived from the trunk and is not obstructive upon inserting a breast into a detector ring. The shield plate has a thickness that varies depending on portions thereof. That is, the shield plate has a thick portion that is thick in a central axis direction of the detector ring, and a thin portion that is thin in the central axis direction. Such thick portion of the shield plate can absorb radiation reliably that is emitted a lot from a heart of a subject. Moreover, in the thin portion, a distance between the subject and the detector ring can be closer. Therefore, the apparatus can obtain a clear tomographic image containing an entire image of the breast.
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