Noise erasing method and apparatus for stimulable phosphor sheet

摘要

In a radiation image recording and read-out system in which a stimulable phosphor sheet is repeatedly used for recording radiation images, and noise developing due to residual radiation energy on the phosphor sheet is eliminated by exposing the phosphor sheet to erasing light prior to radiation image recording step, the level of residual radiation energy is detected, and the amount of exposure of the phosphor sheet to erasing light is controlled according to the detected level of residual radiation energy. The exposure amount is controlled to erase residual radiation energy to a level within the range between 0.01 and 0.0001 with the maximum of the originally stored radiation energy taken as 100.