Photoacoustic image reconstruction method based on compressive sensing
A technology of compressed sensing and photoacoustic image, applied in the field of image processing, which can solve the problems of high manufacturing cost of sensor array and long signal sampling period
Inactive Publication Date: 2015-05-13
NANJING UNIV
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[0004] Purpose of the invention: The technical problem to be solved by the present invention is to provide a photoacoustic image reconstruction method based on compressed sensing for the problems of long signal sampling period or high manufacturing cost of the sensor array in the traditional photoacoustic reconstruction method
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[0023] The present invention combines compressed sensing technology, collects photoacoustic signals through a small number of sensors placed randomly, and converts them to the frequency domain for random sampling, using the spectrum data obtained by random sampling, the measured measurement matrix obtained by calculation, and the orthogonal The basis matrix is used to reconstruct the spatial light absorption distribution of biological tissues by solving an optimization process.
[0024] Such as figure 1 As shown, the present invention discloses a photoacoustic image reconstruction method based on compressed sensing, comprising the following steps:
[0025] Step 1, placing M sensors around the target tissue;
[0026] Step 2, periodically irradiating the tissue W times with a wide-beam short-pulse laser, and each sensor collects photoacoustic signals;
[0027] Step 3, averaging the W times of photoacoustic signals collected by each sensor to obtain M groups of average photoa...
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The invention discloses a photoacoustic image reconstruction method based on compressive sensing. The method includes the steps of placing M sensors around a target tissue; periodically irradiating the tissue W times with board-beam short-pulse laser, and allowing the sensors to acquire photoacoustic signals; averaging the photoacoustic signals acquired W times by the sensors to obtain M average photoacoustic signal groups; subjecting each photoacoustic signal group to FFT (fast Fourier transform) to obtain M spectral data groups; setting M random vectors, and subjecting the spectral data groups to N-point random sampling according to the random vectors; selecting an orthogonal basis matrix, and calculating and measuring the matrix according to pulse responses of the sensors and frequency values obtained by random sampling; solving light absorption distribution of the target biological tissue by compressive sensing so as to obtain a photoacoustically-reconstructed image. The three-dimensional image of inside of the target biological tissue is reconstructed by means of the photoacoustic signals acquired by few sensors and by means of compressive sensing, and the method has the advantages that the sensors are few and the sensors can be randomly placed.
Description
technical field [0001] The invention relates to the field of image processing, in particular to a photoacoustic image reconstruction method based on compressed sensing. Background technique [0002] Photoacoustic imaging uses ultrasound as the information carrier to reflect the spatial optical absorption distribution characteristics of biological tissues. It has the advantages of both pure optical imaging and ultrasonic imaging, and has high contrast and spatial resolution while ensuring a certain imaging depth. rate, especially suitable for imaging of biological soft tissues. Photoacoustic imaging can select the appropriate excitation light wavelength according to the optical absorption characteristics of the target to be measured, can quantitatively measure the physiological parameters related to optical absorption, and can observe the advanced functional activities of organisms without damage and provide High-resolution and high-contrast tissue tomographic images in all ...
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IPC IPC(8): A61B5/00G06T11/00
Inventor 袁杰邵真天夏煦菁封婷朱毅李文超张星储哲琪温馨顾鹏沈庆宏都思丹
Owner NANJING UNIV