Low-hygroscopic anhydrous mirtazapine crystals having a hygroscopic degree of not more than 0. An x-ray source that delivers x-rays through a breast immobilized and compressed between a compression paddle and a breast platform and form an image at a digital x-ray receptor panel. An editing unit reads at least the multiframe structured data corresponding to the sequence numbers, and causes to list-display each multiframe in order of the sequence numbers to a display unit, and carries out editing processing in each multiframe unit with respect to the multiframe structured data in accordance with an arbitrary setting by an operating unit. 10 mm or less in roughness curve average length. The vanes may follow a non-linear path and the cooling fluid may be air.