Portable three-dimensional visual photoacoustic imaging system

Abstract

The invention provides a portable three-dimensional visual photoacoustic imaging system, which comprises a central processing unit, a driving circuit, a data acquisition circuit, a signal amplification circuit, a signal pre-processing circuit, an ultrasonic sensor, an external circuit interface, laser diodes, a collimating lens group, a beam expanding lens group, a focusing lens group, an X-axis reflecting galvanometer, a Y-axis reflecting galvanometer, a field lens, a linear motor, an X-axis motor, a Y-axis motor and a shell. Fast and efficient three-axis scanning galvanometer technology is applied to the field of photoacoustic stimulation. The portable three-dimensional visual photoacoustic imaging system is integrated with the laser diodes, so that portable three-dimensional visual photoacoustic imaging can be realized. Besides, the portable three-dimensional visual photoacoustic imaging system can be widely applied to the field of material detection, industrial flaw detection, medical imaging and the like of complex structures such as square structures, tubular structure, film type structures and the like.

Description

technical field [0001] The invention relates to a photoacoustic imaging technology, in particular to a portable three-dimensional visualized photoacoustic imaging system. Background technique [0002] Photoacoustic technology combines the advantages of high contrast of pure optical imaging and deep penetration of pure ultrasound imaging, which can provide high contrast and high resolution detection images, and has the characteristics of no radiation damage, low cost, safe and convenient use, especially It is the rapid development of three-dimensional photoacoustic imaging technology, and it is considered to be the preferred method for various non-destructive visual inspection imaging in the future. [0003] The Chinese Invention Patent Application Publication (publication number CN 101813672A) discloses a fast three-dimensional photoacoustic imaging system and method based on an area array ultrasonic detector. Photoacoustic imaging. This technology does not require detecto...

AI Technical Summary

Problems solved by technology

This technology does not require detectors to do circular or linear scanning, but requires relatively high-power lasers (such as tunable pulsed lasers or modulated continuous lasers) to generate laser radiation in a large area of ​​three-dimensional space to obtain detectable photoacoustic signals. Lasers usually have many disadvantages such as large size, high price, and difficult maintenance

In 2006, Allen et al. reported that an array of four pulsed laser diodes was used as a photoacoustic excitation source to realize large-area two-dimensional photoacoustic imaging (T. J. Allen, and P. C. Beard, “Pulsed near-infrared laser diode excitation system for biomedical photoacoustic imaging,” Opt. Lett. 31(23), 3462-3464, 2006); in 2008, Maslov et al. reported that using a single amplitude-modulated continuous laser diode as a photoacoustic excitation source also achieved large-area photoacoustic scanning imaging (K . Maslov and L. V. Wang, “Photoacoustic imaging of biological tissue with intensity-modulated continuous-wave laser,” J. Biomed. Opt. 13(2), 024006, 2008); due to the low peak power of semiconductor lasers, generally No more than 200W, so the above method requires the sensor to be driven by a stepping motor to perform circular or linear mechanical scanning to receive photoacoustic signals in different directions, which has many disadvantages such as time-consuming, complicated operation, and large mechanical vibration. limitations

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