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

Abstract

The invention discloses an improved high-resolution acoustic focusing photoacoustic endoscopic imaging back-projection imaging method. The method includes: Step 1, using a photoacoustic endoscopic probe to perform lateral circular scanning; Step 2, dividing the detection surface of the focusing sensor into multiple small units, and each small unit is regarded as a point detector; step 3, using the back projection superposition algorithm, performing signal back projection weighted superposition on the small units after the division of each point detector position at different scanning positions, to get the final image. The method realizes the dynamic focusing of the photoacoustic endoscopic probe in the tangential direction, thereby effectively expanding its imaging depth of field, thereby obtaining a full range of high-resolution acoustic focusing photoacoustic endoscopic imaging results.

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

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