Contrast enhancement of CT images using a multiband filter

By splitting CT images into frequency bands and applying non-linear functions to enhance contrast and reduce noise, the method optimizes CNR, addressing suboptimal image quality and radiation exposure in existing CT image processing.

DE102009019840B4Undetermined Publication Date: 2026-06-25SIEMENS HEALTHINEERS AG
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Patent Information

Application Number
DE102009019840P0
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Filing Date
2009-05-04
Publication Date
2026-06-25
Estimated Expiration
2029-05-04

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Abstract

Method for processing an initial image (I) of an object under investigation, wherein the initial image (I) was reconstructed from measurement data (pin) acquired during a relative rotational movement between a radiation source (C2, C4) of a computed tomography system (C1) and the object under investigation, wherein a frame rate splitting (Fk) of the initial image (I) into at least a first and a second image (Ik) is performed, the first image is modified by means of a first function (G1), wherein the first function (G1) causes a contrast increase within the first image, and the modified first image and the second image are combined (+), for the first image, before the frame rate splitting (Fk) is performed, wherein the non-linear function (Hk) causes a limitation of image values ​​with large absolute values, wherein the second image is modified by means of a second function (Gk).which effects noise reduction limited to an image value range of the second image, wherein the extent of the image value range is determined depending on the magnitude of the noise in the second image, and which includes pixel-dependent parameters so that adaptation to locally varying noise is achieved.
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Citation Information

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