Laser speckle blood perfusion imaging method

A technology of perfusion imaging and laser speckle, applied in the field of laser speckle image processing and analysis, can solve the problems of small change of speckle contrast value, small effective information, data range occupied by static background, etc., to make up for insufficient calculation accuracy, The effect of improving calculation speed

Inactive Publication Date: 2019-01-18
SHANGHAI UNIV OF MEDICINE & HEALTH SCI
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Problems solved by technology

However, due to the small change in blood perfusion on the skin surface, the change in the speckle-contrast ratio caused by it is also small, resulting in less effective

Method used

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  • Laser speckle blood perfusion imaging method
  • Laser speckle blood perfusion imaging method
  • Laser speckle blood perfusion imaging method

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Embodiment

[0038] Examples of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] like figure 1 As shown, the specific method of the large dynamic range blood perfusion imaging described in the present invention is:

[0040] Step 1: Use the matching laser speckle blood flow imager to capture the original laser speckle image, and the shooting site is the back of the human hand in a static state. The resolution of this image is . Use a matrix f(x,y) of size (1040*1392) to store the gray value of each pixel position of the image.

[0041] Step 2: Use a 5*5 sliding window to calculate the ratio of the standard deviation to the mean of the gray values ​​of all pixels in the window, obtain the speckle contrast C of the center point in the window, and assign C to the center point For the corresponding pixels, when the sliding window slides over the entire image f(x,y), a total of (1036*1388) similar calculations are performed, and a...

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Abstract

The invention relates to a laser speckle blood perfusion imaging method comprising the following steps: 1) obtaining contrast ratio data of each pixel of an original laser image; 2) preprocess that contrast ratio data and converting it into blood flow perfusion amount; 3) mark the blood flow perfusion amount corresponding to different pixel points with different colors. Compared with the prior art, the invention has the advantage of fast equal calculation speed, highlight the region with fast aggregation and aggregation movement of red blood cells, high practicability and popularization.

Description

technical field [0001] The invention relates to the field of laser speckle image processing and analysis, in particular to a laser speckle blood perfusion imaging method. Background technique [0002] Laser speckle blood flow imaging technology is a safe and non-contact blood flow detection technology, which is widely used in human body surface microcirculation monitoring, sports injury prevention, vascular status evaluation and other fields. At present, the processing and analysis of laser speckle images mainly include spatial contrast analysis (Laser Speckle Spatial Contrast Analysis, LSSCA) and temporal contrast analysis (Laser Speckle Temporal Contrast Analysis, LSTCA), such as: "A laser speckle blood flow imaging analysis method "(Chinese Invention Patent CN101485565), "A Laser Speckle Blood Flow Imaging Processing System and Method" (Chinese Invention Patent CN102357033), "A Contrast Analysis Method of Laser Speckle Blood Flow Imaging" (Chinese Invention Patent CN10242...

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Application Information

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IPC IPC(8): A61B5/026
CPCA61B5/0261
Inventor 孔平黄钢张建青侯丽英李鹏黄辰
Owner SHANGHAI UNIV OF MEDICINE & HEALTH SCI
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