Method for judging an irradiation field

Details Method for judging an irradiation field Method for judging an irradiation field

1989-08-24

1991-10-08

Berman, Jack I.

Radiant energy

Automatic/serial detection of similar sources

2504841, G01N 2304

Patent

active

050556827

ABSTRACT:
A method for judging an irradiation field comprising steps to obtain an image signal including a plurality of image signal components corresponding to picture elements located on a recording medium from an image readout from the recording medium on which a radiation image of an object has been recorded. The shape and location of a region, which is considered to be an irradiation field formed on the recording medium, are determined on the basis of the image signal components. The ratio of the number of picture elements located in the region to the total number of the picture elements located on the recording medium is calculated and compared with a predetermined value. In cases where the ratio is not larger than the predetermined value, it is judged that the region is not the whole are of the irradiation field.

REFERENCES:
patent: 4851678 (1989-07-01), Adachi et al.
patent: 4851984 (1989-07-01), Doi et al.
patent: 4896038 (1990-01-01), Nakajima
Young et al., "Handbook of Pattern Recogn. and Image Process.", Academic Press, pp. 224, 226 (1986).

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