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Image intensity normalization method for flair MRI images of the brain

A nuclear magnetic resonance and image intensity technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as lack of image intensity, impact on the accuracy of segmentation results, differences in image intensity and contrast, and achieve the effect of simple standardization steps

Active Publication Date: 2022-03-22
DALIAN UNIV
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Problems solved by technology

However, the premise of automatic segmentation is that the image has a uniform intensity distribution range and consistent image contrast, otherwise it will affect the accuracy of subsequent segmentation results
Currently, one of the major drawbacks of Magnetic Resonance Image (MRI) is the lack of a standard and quantifiable interpretation of image intensities
Specifically, when using different MRI scanning equipment or different scanning protocols, there are differences in the intensity distribution range and image contrast of the MRI images of different patients
In addition, due to some uncontrollable factors, even if the same MRI equipment is used to scan the same part of the same patient, the scan results at different times still have differences in image intensity and contrast

Method used

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  • Image intensity normalization method for flair MRI images of the brain
  • Image intensity normalization method for flair MRI images of the brain
  • Image intensity normalization method for flair MRI images of the brain

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Embodiment 1

[0050] Two samples are randomly selected from the test sample set as test samples. figure 2 are the slice images located at cross-section 120 / 256 respectively selected from the MRI data of the training sample, test sample #1 and test sample #2. image 3 is the histogram curve of three samples, from image 3 It can be seen that the intensity value corresponding to the peak of test sample 2 is significantly lower than that of the training sample, and the intensity value corresponding to the peak of test sample 1 is close to the training sample, which is why figure 2 The reason why the slice brightness of test sample 1 is close to the training sample, and the slice brightness of test sample 2 is darker than the training sample. Next, standardize and unify the image intensity of the three samples.

[0051] The first step: Calibrate the truncation point of the training sample

[0052] Figure 4 is the histogram of training samples after the initial calibration of the truncati...

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Abstract

The invention relates to the field of nuclear magnetic resonance image processing, in particular to an image intensity standardization method for brain FLAIR nuclear magnetic resonance images. The method of the present invention searches for a truncation point on the gray histogram of the FLAIR image, and marks the voxels whose gray value is greater than the truncation point so that they do not participate in the linear normalization operation, and perform normalization operations on the voxels whose intensity values ​​are smaller than the truncation point ; By determining the appropriate truncation point position and performing linear normalization, the image intensity can be standardized. The method of the invention only pays attention to the highest peak no matter how many peaks exist in the histogram, so that the standardization step is simpler.

Description

technical field [0001] The invention relates to the field of nuclear magnetic resonance image processing, in particular to an image intensity standardization method for brain FLAIR nuclear magnetic resonance images. Background technique [0002] With the development of artificial intelligence technology, automatic segmentation of lesions in brain MRI images has become a research hotspot in brain medical image processing. However, the premise of automatic segmentation is that the image has a uniform intensity distribution range and consistent image contrast, otherwise it will affect the accuracy of subsequent segmentation results. Currently, one of the main shortcomings of magnetic resonance imaging (Magnetic Resonance Image, MRI) is the lack of a standard and quantifiable interpretation of image intensity. Specifically, when different MRI scanning equipment or different scanning protocols are used, there are differences in the intensity distribution range and image contrast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/40
Inventor 赵欣王欣杨晓王洪凯
Owner DALIAN UNIV
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