Intravascular photoacoustic ultrasound dual-mode imaging system and imaging method thereof

Abstract

Disclosed are an intravascular photoacoustic and ultrasonic dual-mode imaging system and an imaging method, wherein the intravascular photoacoustic and ultrasonic dual-mode imaging system comprises a laser (10), an endoscopic probe (50), an ultrasound transmitting and receiving device (60), a data acquisition system (70) and an image reconstruction and display system (80), wherein the laser (10) is used to output a laser beam and send a trigger signal, the ultrasound transmitting and receiving device (60) is used to control the transmission of an ultrasonic wave, according to the trigger signal, while receiving a photoacoustic signal and an ultrasonic signal, the endoscopic probe (50) is used to laterally reflect the laser beam, after it has been focused or collimated, to a lumen sample to generate the photoacoustic signal by excitation while laterally transmitting an ultrasonic wave and receiving the ultrasonic signal reflected by the lumen sample, the data acquisition system (70) is used to collect a lumen sample photoacoustic signal and ultrasonic signal, and the image reconstruction and display system (80) is used to reconstruct the photoacoustic image and ultrasonic image of the lumen sample. The above-mentioned intravascular photoacoustic and ultrasonic dual-mode imaging system and imaging method improve the utilization of light and the penetration depth of a target tissue, increase the depth and the signal to noise ratio of photoacoustic imaging, and have a better imaging quality.

Description

technical field [0001] The invention belongs to the technical field of endoscopes, and in particular relates to an intravascular photoacoustic ultrasound dual-mode imaging system and an imaging method thereof. Background technique [0002] Intravascular ultrasound imaging is a combination of non-invasive ultrasound imaging technology and minimally invasive catheter technology for the diagnosis of cardiovascular diseases. In the evaluation of the degree of atherosclerosis, intravascular ultrasound imaging can accurately detect atherosclerotic plates size and structure information. Photoacoustic imaging is a non-destructive medical imaging method developed in recent years. This method uses short-pulse (or amplitude-modulated) laser light as the light source, and uses the difference in spectral absorption of the sample to excite different intensities of photo-induced ultrasonic properties. As a new imaging method for information carriers, photoacoustic imaging effectively comb...

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Problems solved by technology

[0004] The present invention provides an intravascular photoacoustic ultrasound dual-mode imaging system and imaging method, aiming to solve the problems of low utilization rate of excitation photoacoustic signals, shallow imaging depth and low signal-to-noise ratio of existing intravascular photoacoustic endoscopes. technical problem

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