| 摘要 |
A radiation application time upper limit calculator calculates a radiation application time upper limit based on a subject thickness, as measured by a subject thickness measuring unit. While an X-ray tube is controlled according to exposure conditions that have been set in order to apply a radiation X to a breast to capture a radiation image thereof, an X-ray tube controller compares the applied radiation time with the radiation application time upper limit. If the applied radiation time exceeds the radiation application time upper limit, then application of radiation to the subject is interrupted, so as to prevent an inappropriate radiation dosage from being applied to an X-ray detector.
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