Scattered ray model derivation apparatus, method, and storage medium, and radiological image processing apparatus, method, and storage medium

By deriving the scattering ray model and removing the scattering ray components, the accuracy problem of subject composition estimation in radiography is solved, and the image separation effect is improved, especially the separation accuracy of bone and soft tissue images.

CN115040146BActive Publication Date: 2026-08-28FUJIFILM CORP
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Patent Information

Application Number
CN202210205563.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2021-03-09
Filing Date
2022-03-02
Publication Date
2026-08-28
Estimated Expiration
2042-03-02

AI Technical Summary

Technical Problem

Existing technologies cannot estimate the composition of a subject with good accuracy, especially in radiography where scattered radiation and beam hardening affect image quality, leading to a decline in image quality.

Method used

By acquiring images of reference objects of different thicknesses, the relationship between the thickness of the reference object and the radiation attenuation coefficient is derived, a scattering model is established, and the scattering component in the radiation image is removed using this model to extract the composition of the subject.

Benefits of technology

It enables accurate estimation of the composition of the subject, improving the quality and separation effect of radiographic images, especially the separation accuracy of bone and soft tissue images.

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Abstract

The present application relates to a scatter model derivation apparatus, a radiation image processing apparatus, a method thereof, and a storage medium. The apparatus includes: a reference image acquisition unit configured to acquire at least one reference image representing a reference object having different thicknesses, the at least one reference image being obtained by radiographing the reference object with a radiation detector in a state in which the reference object is interposed between the reference object and the radiation detector; a reference object thickness and radiation attenuation coefficient relationship derivation unit configured to derive a relationship between a thickness of the reference object and a radiation attenuation coefficient of the reference object corresponding to an energy characteristic of the radiation and reflecting an influence of beam hardening caused by the reference object and an object; a primary ray component derivation unit configured to derive a primary ray component corresponding to the thickness of the reference object included in the reference image based on the relationship between the thickness of the reference object and the radiation attenuation coefficient of the reference object; a scatter ray component derivation unit configured to derive a scatter ray component corresponding to the thickness of the reference object included in the reference image based on a difference between the reference image and the primary ray component; and a scatter model derivation unit configured to derive a scatter model representing a relationship between the thickness of the reference object and a proportion of the scatter ray component with respect to the primary ray component.
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