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Method and device for improving the representation of ct recordings

An image, medical image technology, applied in computing, image enhancement, image analysis, etc., can solve problems such as the identifiability of damaged structures

Inactive Publication Date: 2006-03-08
SIEMENS AG
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  • Claims
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Problems solved by technology

This correction cannot be performed with an arbitrary intensity, since a curling correction of too great an intensity would have an undesired effect on edges with high contrast and thus strongly impair the recognizability of these structures

Method used

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  • Method and device for improving the representation of ct recordings
  • Method and device for improving the representation of ct recordings
  • Method and device for improving the representation of ct recordings

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Embodiment Construction

[0035] To correct for specific physical effects such as scattered radiation, extra focused radiation, etc., the convolution kernels used for reproduction often contain so called warping corrections. It's basically a filter that boosts high frequencies, but with the steepest boost at relatively low frequencies. Such a filter is shown in FIG. 1 , where the local oscillation frequency v is plotted linearly in arbitrary units on the vertical axis and the magnitude of the filter amplitude λ is shown on the horizontal axis. At low frequencies ν, the filter amplitude also has low values ​​around 1, which are first successively raised to higher frequencies ν, approaching a flat-top curve and maintaining this flat-top curve for subsequent frequencies.

[0036] However, in addition to removing the above-mentioned physical errors, the above-mentioned contribution to the convolution also has a visual impact, as figure 2 shown. Arbitrary position x is drawn on the vertical axis, and the ...

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Abstract

A method and a device are disclosed for improving visual recognition in medical images with a large brightness range. This can be done, for example, by electronic manipulation of the represented brightness values, wherein the image has regions with essentially two different brightness intervals. By application of nonlinear scaling, followed by contrast enhancement and subsequent resealing of the image values, structures are represented with a richer contrast without having to tolerate quality losses in the region of originally strong contrasts.

Description

technical field [0001] The invention relates to a method and a device for improving the visibility of medical images having a high brightness range, in particular x-ray or CT images, by electrically manipulating the displayed brightness values, in which The brightness of a pixel corresponds to the absorption value of the object being perspectived, wherein the image shows at least soft tissue structures and bone structures, and has a corresponding image area mainly comprising two different brightness intervals, wherein the first brightness interval corresponds to the bone structure and the second brightness interval corresponds to the bone structure. Two brightness intervals correspond to soft tissue structures. Background technique [0002] In principle such methods and devices for improving the image quality in image processing of medical images (in particular in the field of CT) are well known, correcting certain physical factors such as scattered radiation, additionally f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03A61B6/00
CPCG06T2207/10081G06T5/20G06T5/009G06T5/92
Inventor 雷纳·劳帕克
Owner SIEMENS AG
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