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

1986-09-29

1989-02-21

Howell, Janice A.

Radiant energy

Automatic/serial detection of similar sources

2504841, G01N 2304, H04N 530

Patent

active

048067563

ABSTRACT:
In a method of adjusting read-out conditions for a radiation image stored on a stimulable phosphor sheet by limiting the irradiation field in a rectangular form, digital image signals at respective positions on the stimulable phosphor sheet are detected based on image information obtained by preliminary read-out. X and Y axes are set along two adjacent sides of a contour of the rectangular irradiation field on the stimulable phosphor sheet. The digital image signals are added up in the X and Y axis directions respectively, and positions on the Y axis at which the levels of the added-up signals in the X axis direction are equal to a predetermined threshold value Th and the positions on the X axis at which the levels of the added-up signals in the Y axis directions are equal to the threshold value Th are detected. A region surrounded by straight lines passing through these positions along the X and Y axes is recognized as the irradiation field. The read-out conditions for final read-out are adjusted based on the preliminary read-out image information within the irradiation field.

REFERENCES:
patent: 4519041 (1985-05-01), Fant et al.
patent: 4636641 (1987-01-01), Mori et al.
"Image Contract Enhance . . . " by P. Jackson IBM Tech Dis Bull. vol. 24, No. 12 May-82.

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