ABSTRACT
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The first attempt of radiographic imaging by means of photostimulated luminescence (PSL) was reported in 1947;1 here, the PSL image corresponding to the X-ray image obtained on a chalcogenide photostimulable phosphor sheet was printed out on a photographic film using uniform infrared irradiation. In those days, PSL was investigated vigorously in terms of developing infrared-to-visible image converters; this interest waned soon thereafter. Although a few ideas of radiographic imaging by means of PSL were proposed after the first paper, no practical systems were developed until the following innovation in 1978.
