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    • 5. 发明授权
    • Radiation image information read-out method and system
    • 辐射图像信息读出方法和系统
    • US06417518B2
    • 2002-07-09
    • US09770187
    • 2001-01-29
    • Satoshi ArakawaHiroyuki KarasawaHiroaki Yasuda
    • Satoshi ArakawaHiroyuki KarasawaHiroaki Yasuda
    • G03B4208
    • G01T1/2014
    • An image signal representing radiation image information on an object stored on a stimulable phosphor sheet is read out by scanning the stimulable phosphor sheet with a stimulating light beam and photoelectrically detecting light emitted from the stimulable phosphor sheet upon stimulation thereof by a photodetector having a photoelectric surface. A variable transmittance medium whose transmittance to the light emitted from the stimulable phosphor sheet upon stimulation thereof is variable continuously or stepwise is inserted into the optical path of the light between the stimulable phosphor sheet and the photoelectric surface of the photodetector. The transmittance of the variable transmittance medium is changed according to the amount of light emitted from the stimulable phosphor sheet upon stimulation thereof so that the photoelectric surface is not saturated by an excessive amount of light impinging thereupon.
    • 通过用刺激光束扫描可刺激的荧光体片,并且通过具有光电表面的光电检测器刺激从可刺激的荧光体片发射的光,从而读出表示存储在可刺激的荧光体片上的物体上的放射线图像信息的图像信号 。 一种可变透射率介质,其可刺激时对从可刺激荧光体片发射的光的透射率连续或逐步变化地插入到可刺激的荧光体片和光电检测器的光电表面之间的光的光路中。 可变透射率介质的透射率根据刺激时从可刺激的荧光体片发射的光量而改变,使得光电表面不被过量的光照射而饱和。
    • 9. 发明授权
    • Radiation image read-out apparatus
    • 辐射图像读出装置
    • US5801391A
    • 1998-09-01
    • US756912
    • 1996-11-26
    • Satoshi ArakawaHiroaki Yasuda
    • Satoshi ArakawaHiroaki Yasuda
    • G21K4/00G01T1/00G03B42/02H04N1/04H04N1/12H04N5/32
    • H04N1/04G01T1/2014H04N1/0283H04N1/1295H04N1/12H04N2201/0412H04N2201/0458
    • In a radiation image read-out apparatus, a stimulable phosphor sheet, on which a radiation image of an object has been stored, is scanned with a laser beam of a predetermined output power, which causes the stimulable phosphor sheet to emit light in proportion to the amount of energy stored thereon during its exposure to radiation, and the emitted light is photoelectrically detected with a predetermined sampling time. A response speed r �sec! of the stimulable phosphor constituting the stimulable phosphor sheet, the laser beam output power p �W!, a picture element size s �m!, and the sampling time t �sec! are set such that they may satisfy Formulas (1), (2), and (3): r/(s.multidot.t) 1 (3) The radiation image having been stored on the stimulable phosphor sheet is thereby read out quickly and such that a reproduced image having good image quality may be obtained.
    • 在放射线图像读取装置中,用预定输出功率的激光束扫描其上存储有物体的放射线图像的可刺激的荧光体片,其使得可激发的荧光体片材以与 在其暴露于辐射期间存储在其上的能量的量,并且以预定的采样时间对发射的光进行光电检测。 构成可刺激荧光体片的可激发荧光体的响应速度r [秒],激光束输出功率p [W],像素尺寸s [m]和采样时间t [sec]被设定为使得它们 满足公式(1),(2)和(3):r /(sxt)<5,000(1)t / s2 <80(2)pxt / s2> 1(3)辐射图像已经存储在可刺激 从而可以快速地读出荧光片,从而可以获得具有良好图像质量的再现图像。