Improved back-projection imaging method for high-resolution sound-focusing photoacoustic endoscopic imaging

Abstract

The invention discloses an improved back-projection imaging method for high-resolution sound-focusing photoacoustic endoscopic imaging. The method comprises the following steps: step 1, segmenting a detection surface of a focusing transducer into multiple small units, and taking each small unit as a point detector; step 2, performing signal back projection weighted stacking on the small units in the position of each point detector with a back projection stacking algorithm to obtain a final image. The method has the advantages that dynamic focusing of a photoacoustic endoscopic probe in the tangential direction is realized, so that depth of field of imaging of the probe is increased effectively, and an omnibearing high-resolution sound-focusing photoacoustic endoscopic imaging result is obtained.

Description

technical field [0001] The invention relates to an improved high-resolution acoustic focusing photoacoustic endoscopic imaging back-projection imaging method. Background technique [0002] Acoustic focusing photoacoustic endoscopic imaging is an emerging biomedical endoscopic imaging method integrating high resolution, high penetration depth, and high optical contrast. Partial preclinical application attempts have been made in the human rectum, throat, esophagus, cervical canal and other occasions where the probe size is relatively loose, and it has a good application prospect in these fields. [0003] In the conventional acoustic focusing photoacoustic endoscopic imaging probe, its basic structure consists of installing a hollow focused ultrasound probe at the lower end of the probe shell, passing through a multimode optical fiber in the middle for incident light illumination, and installing a The 45-degree ultrasonic and laser mirrors rotated by the motor to perform 360-d...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an improved high-resolution acoustic focusing photoacoustic endoscopic imaging back projection imaging method, which overcomes the problems in the prior art. There is an irreconcilable contradiction between the optimal lateral resolution and the depth of field in the focal area, and the dynamic focusing of the photoacoustic endoscopic probe in the tangential direction is realized, thereby effectively expanding the depth of field of its imaging, thereby obtaining a full range of high-resolution images. Resolving Acoustic Focusing Photoacoustic Endoscopic Imaging Results

Images