High-sensitivity photoacoustic/ultrasonic dual-mode imaging device and method based on double-curvature linear array detector

Abstract

The invention discloses a high-sensitivity photoacoustic / ultrasonic dual-mode imaging device and method based on a double-curvature linear array detector. The device comprises a photoacoustic excitation system, a double-curvature linear array detection system, a photoacoustic / ultrasonic dual-mode acquisition system, an ultrasonic and echo receiving system, a signal processing system, a control system and an image reconstruction and display system. For a photoacoustic imaging mode, the double-curvature linear array detector is used for receiving photoacoustic spherical waves, so that the photoacoustic spherical waves and the double-curvature linear array detector achieve a self-adaptive matching effect, and the time difference of a photoacoustic signal source in a focal region range of thedetector when reaching the same array element surface or different array elements is minimum, so that the sensitivity of the detector for receiving photoacoustic signals is improved. For an ultrasonicimaging mode, the same double-curvature linear array detector is adopted to carry out ultrasonic tomography in a synthetic aperture ultrasonic transmitting and full aperture ultrasonic receiving mode. Similarly, the included angle between the normal of an ultrasonic reflection wave surface and the normal of each array element is the smallest, and the sensitivity of the detector for receiving ultrasonic signals is further improved.

Description

technical field [0001] The invention relates to the field of photoacoustic / ultrasonic dual-mode array imaging technology and devices, in particular to a high-sensitivity photoacoustic / ultrasonic dual-mode imaging device and method based on a double curvature linear array detector. Background technique [0002] Photoacoustic imaging technology means that when pulsed laser light is irradiated into biological tissue, the light-absorbing area in the tissue will generate mechanical waves. This ultrasonic signal generated by light excitation is called photoacoustic signal, and the photoacoustic signal is in the form of spherical waves. It propagates around, acts on the surface of the ultrasonic detector and is then converted into an electrical signal for reception. The photoacoustic signal generated by the rapid temperature rise and expansion of the light-absorbing medium in biological tissue carries the light absorption characteristic information of the tissue, and the light abso...

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Problems solved by technology

Patent No. CN 105167747B "A Handheld Photoacoustic Imaging Probe" mentioned that the ultrasonic detectors arranged in a linear manner are used as the transmitting and receiving ultrasonic devices. Since the photoacoustic signal radiates to the surrounding in the form of spherical waves, the light absorber reaches the probe The distance difference between different array elements of the detector is large, which will cause a large difference in the amplitude fluctuation of the received photoacoustic signal, and the angle between the normal line of the photoacoustic wave surface and the normal line of the detector array element is relatively large, so the linear array detector receives photoacoustic signal Sensitivity of the signal deteriorates

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