Method of adjusting radiation image read-out conditions

Details Method of adjusting radiation image read-out conditions Method of adjusting radiation image read-out conditions

1986-10-09

1989-02-21

Howell, Janice A.

Radiant energy

Automatic/serial detection of similar sources

2504841, G01N 2304, H04N 530

Patent

active

048067598

ABSTRACT:
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.

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patent: 4519041 (1985-05-01), Fant et al.
patent: 4564861 (1986-01-01), Hishinuma et al.
Jackson, P. "Image Contract Enhance by Local Max & Local Min. Operations", IBM Tech Dis Bull, vol. 24, #12 May 1982.

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