Photoacoustic tomography device and method based on limited-angle scanning

Abstract

The invention relates to the technical field of photoacoustic imaging and discloses a rapid photoacoustic tomography device and a rapid photoacoustic tomography method based on limited-angle scanning. The method comprises the following steps of: transmitting pulse laser into an imaging sample to generate a photoacoustic signal, acquiring the photoacoustic signal at a limited position on an arc through an ultrasonic detector unit, amplifying the signal through a signal amplifier, converting the photoacoustic signal into an electric signal through an analog / digital (A / D) converter, and finally transmitting the electric signal to an oscilloscope to finish digital signal acquisition; inputting the photoacoustic signal of the imaging sample into a computer, performing filtering and Fourier transform processing on the photoacoustic signal through the computer, extracting the frequency domain information of the photoacoustic signal according to experiment conditions, establishing a forward projection operator and a measurement matrix, and performing reconstruction imaging on the signal based on a quick thinning algorithm through the computer. The method and the device have the advantages of short signal acquisition time, high reconstruction speed, convenience in operation, high adaptability, high expansibility and the like.

Description

technical field [0001] The present invention relates to a photoacoustic tomography (Photoacoustic Tomography, PAT for short) technology, in particular to a fast photoacoustic tomography device and method based on limited-angle scanning. Background technique [0002] Photoacoustic imaging technology is a newly developed non-invasive and non-ionizing medical imaging technology. It has developed rapidly in recent years and has become a frontier hot topic in international research. The generation of photoacoustic signals is a process of energy conversion between composite media. It combines the non-destructive and highly selective excitation characteristics of pure optical imaging with the low attenuation and high penetration characteristics of pure ultrasonic imaging. Obtain high image resolution and contrast, and the image conveys a large amount of information, which can provide morphological and functional information. Photoacoustic imaging technology has been widely used in...

AI Technical Summary

Problems solved by technology

The existing unit detector photoacoustic imaging mainly adopts the method of collecting signals at multiple points on the circumference, and the device scans for a long time. The corresponding reconstruction algorithms include deconvolution, phase control focusing, inverse Radon transform, iterative reconstruction algorithms, etc., but accurate reconstruction requires The amount of data is large and the complexity of the algorithm is high, so the simplification of signal acquisition and efficient reconstruction algorithm are the key to the application of photoacoustic imaging

Images