High-speed large-view-field multi-spectral photoacoustic imaging method and device

Abstract

The invention discloses a high-speed large-view-field multi-spectral photoacoustic scanning imaging method and device. According to the scanning imaging method, a one-dimension scanning galvanometer and an F-theta lens set are utilized for gathering the collimated pulse laser into linear light spots to activate an organized body to generate light-induced ultrasonic signals, and after a sound reflector arranged in the lateral direction reflects photoacoustic signals, a non-focus ultrasonic transducer is used for receiving externally transmitted ultrasonic signals. According to the system, only a one-dimension scanner is needed for scanning, an algorithm is not needed, and a two-dimension photoacoustic absorbing distribution graph can be obtained at a high speed. The scanning imaging device comprises a photoacoustic light source generating activating module, an ultrasonic coupling module and a photoacoustic signal collecting and device scanning synchronous control module. According to the scanning imaging method, only a one-dimension optical scanning mode is adopted, the difficulty of scanning control is lowered, the imaging time is shortened, and large-view-field and high-definition two-dimension tomography is achieved. The scanning imaging device is simple, low in cost, portable, easy to popularize and capable of performing clinical monitoring.

Description

Technical field [0001] The invention belongs to scanning tomography imaging technology, and particularly relates to a high-speed multi-spectrum large-field-of-view photoacoustic scanning imaging method and device. Background technique [0002] F-theta lens is a lens system with special requirements in laser scanning imaging system. It can focus the laser beam reflected by a scanning element such as a laser galvanometer on the scanning plane to obtain a one-dimensional or two-dimensional scanning image. It has the characteristics of large field of view, small relative aperture, uniform illuminance, and flat image surface, and is widely used in laser marking, cutting, perforation, and stripe code recognition. Because it is easy to combine with various scanning devices, it has the characteristics of high response speed, large field of view, focusing spot can be changed according to requirements, and strong environmental adaptability, which has broad application prospects. [0003] P...

AI Technical Summary

Problems solved by technology

2. Two-dimensional galvanometer scanning, this type of scanning method is commonly used in photoacoustic microscopy imaging systems, and its imaging speed has been greatly improved, but it is difficult to obtain large-area two-dimensional scanning images in a short time due to the limitation of the field of view , and the two-dimensional galvanometer scanning control requires the cooperation of two dimensions, which also increases the consumption of scanning time and the difficulty of system development

This type of method must be affected by the small field of view in one direction and also by the slow speed of mechanical scanning, making it difficult to obtain faster scanning speeds

In addition, there are limited-angle data acquisition, electronic scanning, etc., but these methods are still difficult to break through the limitations of algorithms and field of view to obtain higher imaging speed and larger field of view space

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