METHOD OF ADJUSTING SCALE FACTOR FOR RADIATION IMAGE

摘要

METHOD OF ADJUSTING SCALE FACTOR FOR RADIATION IMAGE In a radiation image recording and reproducing system, final read-out of a radiation image stored in a stimulable phosphor sheet is conducted by exposing the stimulable phosphor sheet to stimulating rays, and photoelectrically detecting light emitted by the stimulable phosphor sheet upon stimulation thereof to obtain a visible image. Prior to the final read-out, preliminary read-out is conducted for detecting the image input information by use of stimulating rays having stimulation energy lower than the stimulation energy of stimulating rays used in the final readout. By the preliminary read-out, the minimum stimulated emission intensity among all points over the whole surface of the stimulable phosphor sheet and that among all points in one region within the radiation exposure field of the stimulable phosphor sheet at the time of the image recording are measured. A scale factor in the final read-out is adjusted in accordance with the difference between the minimum stimulated emission intensities thus measured.