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Dynamic range conversion based medical image window width/level display method

A dynamic range and medical image technology, applied in the field of medical image processing, can solve the problems of missing part of image information, loss of image information, and insufficient reflection of the importance of different grayscale intervals, etc.

Inactive Publication Date: 2016-05-04
CHENGDU RUIMING MEDICAL INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The histogram specification method in image processing embodies such an idea in a certain sense, but the use of medical image display causes image information loss, and it is difficult to ensure the continuity of visual effects
[0004] In summary, the prior art medical image window width and window level display methods have the following disadvantages: 1) The importance of different gray scale intervals is not fully reflected after window adjustment; 2) Part of the information entropy of the image may be lost

Method used

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  • Dynamic range conversion based medical image window width/level display method
  • Dynamic range conversion based medical image window width/level display method
  • Dynamic range conversion based medical image window width/level display method

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Experimental program
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Embodiment 1

[0028] Such as figure 1 As shown, it is a flow chart of a method for displaying the window width and level of medical images based on dynamic range conversion disclosed in the embodiment of the present invention. The method includes:

[0029] Step S101: According to prior knowledge or through calculation, a weight function representing the importance of image pixel values ​​is given.

[0030] Suppose the pixel value of the original display image is x, x can be any pixel of the original display image, and the weight function is a unary function w(x) about x, where w(x)≥0. w(x) is given by prior knowledge or calculation, and for the pixel value x appearing in the image, w(x)>0 is required.

[0031] Step S102: According to the probability density function and weight function of the original display image, construct a dynamic range conversion function that is strictly monotonically increasing on the set of pixel values ​​with non-zero probability density.

[0032] Let p(x) be th...

Embodiment 2

[0039] In order to illustrate the implementation steps intuitively, we use simplified images for illustration, figure 2 It is a simplified grayscale image with non-zero pixel values ​​x∈{10,11,12,13,255}, where the pixel value of the triangle area is 10, the pixel value of the regular hexagonal area is 11, and the pixel value of the parallelogram area The value is 12, the pixel value of the rectangular area is 13, and the pixel value of the background area is 255. We can imagine that in actual medical images, these geometric regions represent different densities of human tissue imaging. figure 2 and image 3 It can be seen that the pixel values ​​in these areas are relatively close, and human eyes cannot distinguish such a small difference in grayscale, and the color differences in these areas cannot be visually reflected, that is, the contrast in these areas is very inconspicuous, and it seems almost the same. Take the following steps to process:

[0040] (1) According ...

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Abstract

The invention provides a dynamic range conversion based medical image window width / level display method. The method comprises the steps of determining a weight function representing the importance of an image pixel value; according to a probability density function of an original displayed image and the weight function, constructing a dynamic range conversion function with a characteristic of strict monotonous increasing in a pixel value set with the nonzero probability density; converting a pixel value range [min, max] of the original displayed image into a pixel value range [f(min), f(max)] of a target displayed image through the dynamic range conversion function; and mapping the pixel value range [f(min), f(max)] of the target displayed image to a visible gray interval. With the adoption of the method provided by the invention, higher display contrast of important information of a medical image can be achieved without information entropy loss, and key information useful for diagnosis is fully highlighted, so that the image display effect is improved.

Description

technical field [0001] The invention relates to the field of medical image processing, in particular to a method for displaying medical image window width and level based on dynamic range conversion. Background technique [0002] Digital medical images are mostly displayed as grayscale images on the display, and most displays often only support 8-bits grayscale display. The general method is to map a part of the pixel value range of the original image to the display from black to white. grayscale. The selected range of pixel values ​​is called the window, the difference between the upper and lower limits of the range is called the window width, and the center of the range is called the window level. This method is called window adjustment technology. The most commonly used method is to linearly map the image pixel value area to the 0-255 visible gray scale range. The result of this is that regardless of the role of the pixel value in the image, the equal-length pixel value ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/00
CPCG06T3/04
Inventor 魏平李均利
Owner CHENGDU RUIMING MEDICAL INFORMATION TECH