Blood oxygen distribution imaging method and system based on double-band diffuse reflection space mapping

By employing a dual-band diffuse reflection spatial mapping method, the problems of insufficient measurement accuracy and spatial distribution characterization in non-contact blood oxygen detection are solved, achieving high-resolution two-dimensional blood oxygen imaging and improving the detection accuracy and reliability under complex tissue conditions.

CN122004853BActive Publication Date: 2026-07-07SUZHOU MUNICIPAL HOSPITAL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SUZHOU MUNICIPAL HOSPITAL
Filing Date
2026-04-14
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing non-contact pulse oximetry technology has shortcomings in terms of measurement accuracy and spatial distribution characterization, especially under the influence of complex tissue optical properties, making it difficult to meet the requirements of high-precision applications.

Method used

A method based on dual-band diffuse reflection spatial mapping is adopted. By acquiring the original image sequence of dual-band diffuse reflection of the tissue region under test in two specific bands, preprocessing and region segmentation are performed to construct a local optical path correction matrix. Combined with the improved Lambert-Beer law, a functional mapping relationship between the reflection attenuation ratio and blood oxygen saturation is established. Spatial regularization optimization is performed to generate a two-dimensional blood oxygen saturation distribution map.

Benefits of technology

It significantly enhances the measurement accuracy and spatial distribution characterization capability of blood oxygen detection, enables high-resolution two-dimensional imaging under complex tissue conditions, and improves noise resistance and the reliability of imaging results.

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Abstract

The application discloses a blood oxygen distribution imaging method and system based on double-band diffuse reflection space mapping, relates to the field of non-contact physiological parameter detection for biomedical optical application, and comprises the following steps: acquiring a double-band diffuse reflection original image sequence of a to-be-detected tissue region under two specific bands, obtaining normalized double-band images and a region of interest through preprocessing and region segmentation; estimating an effective optical path ratio between the two specific bands based on image gradient information in a local neighborhood of each pixel, and constructing a local optical path correction matrix; according to a double-band reflection attenuation ratio, a corresponding effective optical path ratio, and extinction coefficients of oxygenated hemoglobin and deoxygenated hemoglobin under the two specific bands, a double-band inversion model based on an improved Lambert-Beer law is used to calculate a preliminary blood oxygen saturation, and a two-dimensional blood oxygen saturation distribution map is generated through spatial regularization optimization. Therefore, the spatial representation capability, inversion stability and imaging accuracy of non-contact blood oxygen imaging can be improved.
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