Fuji Photo Film Company, Limited

Takayoshi Fukuoka

Satoshi Arakawa

Ikuo Mori

Yosuke Nakajima

Yoshiyuki Hoshi

In a radiation image read-out apparatus, a phosphor sheet (70), represented by the formula Gd.sub.2 O.sub.2 S:Tb.sup.3+, is located facing a stimulable phosphor sheet (10) in such a manner that when it is exposed to x-rays (44) it produces fluorescence (71) having a wavelength that fall within the stimulation wavelength range of the stimulable phosphor. When the stimulable phosphor sheet (10) is exposed to the fluorescence (71), part of the energy stored on the layer of stimulable phosphor during its exposure to the x-rays (44) is released. In this manner, the stimulable phosphor sheet (10) is approximately simultaneously subjected to the operation for recording the radiation image and the operation for slightly erasing the energy store thereon during its exposure to the x-rays (44).

Radiation image read-out apparatus, radiation image recording method and

In a radiation image read-out apparatus, a stimulable phosphor sheet, which has been exposed to radiation which has passed through an object whose radiation absorptivity is basically distributed with predetermined characteristics, is exposed to stimulating rays which cause the stimulable phosphor sheet to emit light in proportion to the amount of energy stored thereon during its exposure to the radiation. The light, which is emitted by the portion of the stimulable phosphor sheet exposed to the stimulating rays, is detected with a photoelectric read-out device, and an image signal representing a radiation image of the object is thereby obtained. An optical filter is located between the stimulable phosphor sheet and the photoelectric read-out device such that the position of the optical filter corresponds to the position of the radiation image of the object stored on the stimulable phosphor sheet. The transmittance of the optical filter with respect to the light emitted by the stimulable phosphor sheet is distributed such that a basic difference in the radiation absorptivity of the object is compensated for.

A method of recording a radiation image having excellent sharpness which comprises

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Tokyo, Japan

Takayoshi Fukuoka