Photoacoustic imaging system

Abstract

The invention discloses a photoacoustic imaging system which comprises an optical frequency comb module, a beam combining and splitting module, a balance detection module, a chopping module, a photoacoustic sample cell, an ultrasonic detection module, a control scanning module, a data acquisition module and a signal processing and imaging module; the optical frequency comb module generates two laser signals with different repetition frequencies; the beam combining and splitting module performs beam combining and splitting on the laser signals to form a detection laser signal and a reference laser signal; the balance detection module performs balance detection on the reference laser signal to obtain a first electric signal; the chopping module extracts an interference signal in the detection laser signal as an excitation pulse signal and emits the excitation pulse signal into the photoacoustic sample cell to generate a photoacoustic signal; the ultrasonic detection module performs transduction of the photoacoustic signal to obtain a second electric signal; and the data acquisition processing module acquires the first electric signal and the second electric signal and transmits the signals to the signal and imaging processing module for imaging a to-be-detected object. By combining the double-optical-comb spectrum technology and the photoacoustic imaging technology, the imaging speed and efficiency are high, and the cost is low.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of photoacoustic imaging, and in particular, to a photoacoustic imaging system. Background technique [0002] Photoacoustic imaging is a bio-optical functional imaging technology based on the photoacoustic effect and using ultrasound as a carrier. When the pulsed laser irradiates the measured object, the irradiated area absorbs light energy, causing adiabatic expansion to generate ultrasonic signals, namely photoacoustic signals. When the intensity-modulated continuous laser is used as the excitation source, the frequency of the photoacoustic signal is the same as the modulation frequency of the irradiated light, and its intensity and phase depend on the optical, thermal, elastic and geometric characteristics of the material, so the characteristics of the photoacoustic signal reflect the The morphology, absorption distribution and other characteristics of the irradiated material. Phot...

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Problems solved by technology

[0005] In view of this, an embodiment of the present invention provides a photoacoustic imaging system to solve the technical problems of high photoacoustic imaging cost, slow imaging speed and low imaging efficiency in the prior art

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