A method for time-reversal reconstruction of intravascular photoacoustic images

Abstract

Provided is a time reversal reconstruction method of an opto-acoustic image in a blood vessel. The method comprises the steps of: firstly establishing an initial image with an imaging conduit center serving as an image center; then regarding each detector measuring position on a scanning trace circle as a point opto-acoustic signal source, and establishing a back propagation model of ultrasonic waves in a homogeneous and lossless biological tissue; and finally reconstructing an initial opto-acoustic pressure distribution image of a blood vessel cross section according to the established back propagation model of the ultrasonic waves. According to the invention, opto-acoustic signal data from a blood vessel wall tissue, collected by an ultrasonic detector, is adopted to simulate the back propagation process of the opto-acoustic signal in a time domain, a two-dimensional gray scale opto-acoustic pressure distribution image of the blood vessel cross section is obtained by the reversal, and a tissue structure of the inner part of the blood vessel wall is displayed. The time reversal reconstruction method of the opto-acoustic image in the blood vessel is not restricted by an axiomatized derivation formula, is less in constraint condition, is high in robustness, is less in dependent hypothesis or initial condition, and is not liable to be influenced by an image artifact, so that imaging precision is higher, and a relatively ideal reconstruction effect can be obtained.

Description

technical field [0001] The invention relates to a method for performing time inversion reconstruction on a photoacoustic image in a blood vessel to obtain a grayscale image of light absorption distribution in an axial section of a blood vessel wall, and belongs to the technical field of medical imaging. Background technique [0002] Intravascular photoacoustic (IVPA) imaging technology is an emerging minimally invasive interventional vascular imaging method following intravascular ultrasound (IVUS) and intravascular optical coherence tomography (IV-OCT) , which combines the advantages of pure optical imaging and pure ultrasound imaging, makes up for the shortcomings of existing interventional vascular imaging techniques, and can achieve high-resolution and high-contrast depth imaging of vascular lumens, vessel walls, and vulnerable plaques. [0003] The imaging principle of IVPA is to insert a miniature photoacoustic imaging catheter into the blood vessel cavity to be measur...

AI Technical Summary

Problems solved by technology

At present, the reconstruction of IVPA images mostly adopts the filtered back-projection (FBP) algorithm, which has the advantages of simple principle and fast operation speed, but has the disadvantage of low imaging accuracy, so the reconstruction effect is not ideal, so it is necessary to study new reconstruction method

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