Method of and apparatus for processing radiation image

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250587, 378 62, G06F 1500

Patent

active

052914038

ABSTRACT:
A plurality of original image signals which represent a plurality of radiation images are obtained by exposing recording media to radiations with different energy levels which have passed through an object constituted of a plurality of tissues exhibiting different levels of radiation absorptivity with respect to radiations with different energy levels. An extracted image signal representing an extracted image of a predetermined tissue in the object is obtained on the basis of the original image signals. A processed image signal representing a processed image is obtained by calculating a processed image signal component S' corresponding to a predetermined picture element in the extracted image according to formula S'=Sorg+.beta..multidot.(S-Sus) wherein Sus represents an unsharp mask signal obtained by averaging the extracted image signal components corresponding to a number of picture elements which surrounds a predetermined picture element within a predetermined region, Sorg represents the original image signal component corresponding to the predetermined picture element, S represents the extracted image signal corresponding to said predetermined picture element, and .beta. represents a coefficient, and by repeating the calculation according to the formula with all the picture elements in the extracted image being sequentially taken as the predetermined picture element.

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