Method of adjusting radiation image read-out conditions

摘要

In a method of adjusting read-out conditions for a radiation image stored on a stimulable phosphor sheet by limiting the irradiation field, digital image signals at respective positions on the stimulable phosphor sheet are detected from image information obtained by preliminary read-out. A difference image constituted by difference values between the digital image signals is created and scanned in one direction to detect a section intecepted between a difference value not smaller than a threshold value +Th and a difference value not larger than -Th on each scanning line. Or, the difference image is scanned in two or more directions to detect a range comprising a group of the intercepted sections on scanning lines in each of the scanning directions. The read-out conditions in final read-out are adjusted based on the preliminary read-out image information within the section on each scanning line or within an irradiation field region determined based on the ranged detected in the respective scanning directions.