Array probe-based real-time photoacoustic imaging device

Abstract

The invention provides an array probe-based real-time photoacoustic imaging device, which belongs to the technical field of nondestructive testing on biological tissue. The array probe-based real-time photoacoustic imaging device in the invention adopts a multi-element array ultrasonic probe to synchronously observe and acquire photoacoustic signals which are amplified and then transmitted to an A / D converter for uniform sampling, and adopts an on-site programmable gate array FPGA to input acquired photoacoustic image data into a memory of a computer through a USB interface and perform online beamforming, digital signal and image processing and real-time display on acquired photoacoustic image data on the computer. The array probe-based real-time photoacoustic imaging device in the invention comprises a laser, the multi-element array ultrasonic probe, a multi-channel parallel acquisition circuit and the computer. The array probe-based real-time photoacoustic imaging device in the invention adopts a multi-channel parallel acquisition and distributed quickly-reconstructed processing mechanism and a hardware platform to ensure no bottleneck in a process of signal acquisition and signal processing and realize the real-time imaging of the photoacoustic signals, and adopts the multi-channel parallel acquisition circuit to realize the parallel acquisition and storage of the data; and in the multi-channel parallel acquisition circuit, the number of channels can be adjusted according to actual needs so as to acquire optimal imaging effect.

Description

technical field [0001] The invention relates to a photoacoustic tomography device, in particular to a real-time photoacoustic imaging device based on an array probe. Background technique [0002] Photoacoustic imaging technology based on photoacoustic effect is a new type of non-destructive biomedical imaging technology that has emerged in recent years. It uses short-pulse laser as the excitation source. According to different biological tissues, the laser has different optical absorption coefficients for specific wavelengths of laser light and then radiates radiation. The principle of ultrasonic imaging, this method organically combines the characteristics of optical imaging and acoustic imaging, can provide high-resolution and high-contrast tissue tomographic images of deep tissue, and has broad application prospects in the field of medical applications. Research hotspots in the field of medical imaging. [0003] In recent years, the application of photoacoustic technolog...

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Problems solved by technology

This is mainly due to: the image data acquisition and reconstruction time is long, the data acquisition process usually needs repeated data acquisition and averaging for each scanning point, and the image reconstruction process needs to scan the imaged object multiple times, so it generally takes several times to form an image. Minutes to tens of minutes[1][2], currently Yin has achieved fast photoacoustic tomography by using multiple linear array detectors, combined with electronic scanning and phase control focusing technology, and the imaging time resolution has been increased to 5 seconds [3], but there is still a big gap from real-time imaging

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