Radiation image read-out method

Details Radiation image read-out method Radiation image read-out method

1989-03-22

1990-08-21

Howell, Janice A.

Radiant energy

Automatic/serial detection of similar sources

2504841, 382 18, G01N 2304

Patent

active

049508946

ABSTRACT:
In a method of reading out a radiation image stored in a stimulable phosphor sheet, preliminary read-out for approximately detecting the image is conducted. A cumulative histogram of the image information is created, read-out conditions in the final read-out are corrected based on a characteristic value of the cumulative histogram, then the final read-out is conducted using the corrected conditions. Alternatively, a standard image information range is determined from the characteristic value, and the read-out conditions are adjusted so that the standard range corresponds to a predetermined electronic signal range. In addition, in the read-out method where gradation processing is performed for electronic image signals obtained by photoelectrically detecting the phosphor light emitted by the sheet, histogram of the image signals is created, and a desired image signal range is determined therefrom. A cummulative histogram then is created, the desired range is corrected based on a characteristic value of the cumulative histogram, and gradation processing conditions are adjusted so that the corrected desired signal range corresponds to a predetermined electronic signal range. Alternatively, a standard signal range is determined based on the characteristic value, and gradation processing conditions are adjusted so that the standard range corresponds to a predetermined electronic signal range.

REFERENCES:
patent: 4284889 (1981-08-01), Kato et al.
patent: 4310886 (1982-01-01), Kato et al.
patent: 4578712 (1980-03-01), Matsunawa
"A Statist Meth for Image Classif. . ." by Chung J. of Applied Photo Cing vol. 3#2, 1977 p. 74.

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