Intravascular photoacoustic image reconstruction method and system for solving the problem of uneven sound speed

Abstract

The invention discloses an intravascular photoacoustic image reconstruction method and system for solving the problem of uneven sound velocity. The method includes: preset a plurality of fixed sound velocities; obtain the initial light absorption energy distribution diagram corresponding to each fixed sound velocity according to the obtained photoacoustic signal; determine the fixed sound velocity corresponding to the maximum degree of focus according to the multiple distribution diagrams; Obtain the delay compensation values ​​at N different positions in the blood vessel cross-section at a fixed sound velocity; obtain the detection depth values ​​corresponding to the delay compensation values; determine the relationship between the delay compensation values ​​and the detection depth values; obtain the The delay compensation value corresponding to the detection depth; the real propagation time of the ultrasonic wave at each position is obtained according to each delay compensation value; the final light absorption energy distribution map is reconstructed according to each real travel time. By adopting the method or system of the present invention, the light absorption energy distribution map is reconstructed on the premise that the sound velocity distribution in the tissue is not uniform, thereby improving the quality of intravascular photoacoustic imaging.

Description

technical field [0001] The invention relates to the field of medical imaging, in particular to an intravascular photoacoustic image reconstruction method and system for solving the problem of uneven sound velocity. Background technique [0002] Intravascular photoacoustic (IVPA) imaging is an emerging intravascular imaging technique and is a supplementary imaging method to intravascular ultrasound. Based on the photoacoustic effect of biological tissue, the technology takes the light absorption coefficient and scattering coefficient of the tissue as the imaging parameters, and can obtain the morphological structure and tissue functional components of the cross-section of the blood vessel in real time, combining the high contrast of optical imaging and ultrasonic imaging advantages of high resolution. The imaging principle is: insert a special imaging catheter into the blood vessel cavity, and use short-pulse laser to irradiate the surrounding vessel wall tissue through the ...

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Problems solved by technology

[0004] The object of the present invention is to provide a method and system for intravascular photoacoustic image reconstruction that solves the problem of uneven sound velocity. Under the premise of uneven sound velocity distribution in tissues, the light absorption energy distribution map on the cross-section of blood vessels is reconstructed to improve the quality of blood vessels. Quality of internal photoacoustic imaging

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