A Reconstruction Method Applied to Magnetoacoustic Coupling Imaging in Acoustic Inhomogeneous Media

Abstract

The invention discloses a magneto-acoustic coupling imaging reconstruction method applied to acoustic uneven media. The magneto-acoustic coupling imaging reconstruction method includes acquiring symmetrical acoustic pressure data by the aid of linear-array transducer arrays in signal acquisition procedures; solving acoustic crossing time by the aid of correlation between the data acquired by the aid of transducers at symmetrical positions; combining the acoustic crossing time with algebraic iterative reconstruction algorithms to reconstruct acoustic speed distribution of samples; solving initial acoustic source distribution of the samples by the aid of the solved acoustic speed distribution. The magneto-acoustic coupling imaging reconstruction method applied to the acoustic uneven media has the advantages that reconstruction errors due to the unevenness of acoustic characteristics of the samples can be effectively eliminated, the acoustic speed distribution of the samples can be acquired by the aid of the correlation of signals, and necessary conditions can be provided for accurately reconstructing acoustic sources.

Description

technical field [0001] The invention relates to a magnetoacoustic coupling imaging reconstruction algorithm. In particular, it relates to a reconstruction method for magneto-acoustic coupling imaging of acoustic inhomogeneous media, which uses the correlation of magneto-acoustic signal points detected by the transducer to solve the sound velocity distribution, and then reconstructs the original sound source distribution. Background technique [0002] Magnetoacoustic coupling imaging is a new type of imaging technology for electrical properties of biological tissue that combines electrical impedance imaging and ultrasound imaging. The principle is: place the measured biological tissue in a constant magnetic field, give the biological tissue a pulsed magnetic field parallel to the direction of the constant magnetic field, and then generate an induced current inside it (or directly inject pulse current into the biological tissue through electrodes); The injected current inside...

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Problems solved by technology

[0006] In the analysis of the inverse problem of magneto-acoustic coupling imaging, that is, the reconstruction process, the current research ignores the complex acoustic properties inside the biological tissue, and reconstructs the electrical property distribution inside the object with an ideal acoustic uniform mode; however, the complex internal properties of the biological tissue The acoustic structure causes reflection, refraction, transmission and other phenomena in the propagation process of the vibration sound wave, which seriously affects the accurate positioning of the sound source in the reconstruction process

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