Rapid three-dimensional photoacoustic imaging system based on ultrasonic plane array detector and method thereof

Abstract

The invention discloses a rapid three-dimensional photoacoustic imaging system based on an ultrasonic plane array detector which has the advantages of simple operation, low manufacturing cost and convenient detection and an imaging method thereof. The rapid three-dimensional photoacoustic imaging method based on the ultrasonic plane array detector mainly comprises the following steps: adopting a laser pulse to excite ultrasonic signals which can produce a light induced thermal elastic effect, collecting photoacoustic signals in parallel simultaneously with a plane array detector and multiple array elements, processing the signals in a three-dimensional phase-controlled algorithm, and reconstructing an optical absorption and distribution image for a sample to be detected. The three-dimensional photoacoustic imaging device comprises a photoacoustic excitation source device, a photoacoustic signal receiving and collecting device and a computer component. The invention overcomes the defects of the traditional technology such as low imaging speed, poor stability due to long-term system operation, complex device and the like, simultaneously combines the advantages of pure acoustics and pure optical imaging, and can provide images reflecting optical absorption and distribution of tissues. The device of the invention has the advantages of simple structure and easy promotion.

Description

technical field [0001] The invention relates to a non-destructive fast imaging technology, in particular to a fast three-dimensional photoacoustic imaging system and method based on an area array ultrasonic detector. Background technique [0002] As a novel non-destructive material structure detection technology, photoacoustic imaging has been greatly developed in the past ten years. Photoacoustic imaging is based on the principle of photoacoustic effect. When it is a substance, the part with light energy absorption characteristics in the substance produces periodic instantaneous temperature changes, so that the light-absorbing medium here and the surrounding substances produce periodic stress or pressure changes due to thermal expansion, and finally by this effect The ultrasonic signal is generated by changing the force, which is the photoacoustic signal. The photoacoustic effect is actually a conversion process of light energy to sound energy. The photoacoustic signal is...

AI Technical Summary

Problems solved by technology

Mobile detectors generally adopt the method of tomographic 360°rotational scanning or plane point scanning, but either way has the disadvantages of long data acquisition time, complex experimental equipment and imaging algorithms, etc.

Moreover, during the long-term mechanical scanning and data acquisition process, inevitable factors such as mechanical vibration, electronic equipment stability, and working point drift will bring random errors to the imaging results, thereby affecting the quality of the reconstructed image and the reliability and reliability of the imaging results. authenticity

Recently, two-dimensional detectors have the capability of lateral tomography at different depths, but they need to rely on hardware signal delay circuits to achieve selective imaging of signals at different acquisition depths. In fact, it is difficult to achieve fast and real-time imaging.

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