抄録
We measured the fading effect in a relatively short time (minute order) on Imaging Plate indirectly from pixel value. We ascer lore fading effect than been recognized. So, especially when we measure the digital characteristic curve of FCR system, the fading effect cannot be ignored. Therefore we prevented a change of the digital characteristic curve from fading effect to some degree when we read images after 20 minutes from an exposure.
Nevertheless, when we measure in a small latitude, the fading effect is strong and we can't get a true digital characteristic curve.
But, by use of exposure with aluminum step-wedge method, we finally had a good result.
