Experimental Study of Thermo-acoustic Imaging with the Current Injection

Li, Yanhong; Liu, Guoqiang; Song, Jiaxiang; Xia, Zhengwu; Xia, Hui

doi:10.12783/dtetr/apop2017/18748

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…Yang et al [63] conducted an analysis of the magnetoacoustic and thermoacoustic effects with pulsed magnetic excitation. Li et al [64] from the Institute of Electrical In 2020, Li et al [66] further analyzed and evaluated TAT-CI. The spatial resolution and conductivity resolution of the images were tested on a rectangular low conductivity gel phantom.…”

Section: Thermoacoustic Tomographymentioning

confidence: 99%

A Review on the Coupled Method of Using the Magnetic and Acoustic Fields for Biological Tissue Imaging

Liu

2023

Chin. J. Electr. Eng.

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Magnetic field and acoustic field coupled imaging methods mainly include magnetoacoustic tomography, magneto-acousto-electrical tomography, and thermoacoustic tomography, all of which non-invasively achieve the electrical conductivity imaging of tissues with a resolution of up to the millimeter scale. The principles of these three imaging methods and the research progress in the last two decades are reviewed. First, the principles of the three magnetic and acoustic field coupled methods are individually introduced. The progress in medical electromagnetic imaging is further elaborated, and finally the future directions and summary of the coupled imaging methods are summarized.

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Section: Thermoacoustic Tomographymentioning

confidence: 99%

A Review on the Coupled Method of Using the Magnetic and Acoustic Fields for Biological Tissue Imaging

Liu

2023

Chin. J. Electr. Eng.

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“…Additionally, they investigated the utilization of magnetic nanoparticles converting magnetic relaxation loss into acoustic waves (Feng 2015). In contrast to the Zheng group, the Liu group employed pulsed current, potentially enhancing penetration depth through the generation of ultrasonic signals with a stronger signal-to-noise ratio (Yang et al 2018, Xia et al 2019, Li et al 2019a, 2019b, 2020b. This new imaging modality of TAT is referred to as ACTAI.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of acoustic pressure spectrum shifting toward lower frequencies in applied current thermoacoustic imaging

Zhang,

Xia,

et al. 2024

Phys. Med. Biol.

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Objective: Thermoacoustic tomography (TAT) is a promising imaging technique used for early cancer diagnosis, tumor therapy, animal study and brain imaging. Although it's widely known that the TAT frequency response depends on the pulse width of the source and the size of the object, a thorough comprehension of the quantitative frequency modulation in TAT and the mechanism governing the shift in the thermoacoustic pressure spectrum towards lower frequencies with respect to the excitation source is still lacking. This study aims to understand why the acoustic pressure spectrum and the final voltage signals shift towards lower frequencies in TAT. Approach: We employed a linear time-invariant model. In the proposed model, the applied current thermoacoustic imaging (ACTAI) processes is divided into the thermoacoustic stage and the acoustoelectric stage. These two stages are characterized by the thermoacoustic transfer function and the transducer transfer function respectively. We confirmed the effectiveness of our model through a rigorous examination involving both simulations and experiments. Main results: Simulation results indicate that the thermoacoustic transfer function behaves as a low-pass filter. The inherent low-pass nature induces a shift towards low frequencies in the acoustic pressure spectrum. Experiments further confirm this behavior, demonstrating that the final electrical voltage also shift towards low frequencies. Notably, employing the proposed model, there is a remarkable consistency between the main frequency bands of the synthesized and measured final voltage spectrum. Significance: The propoed model thoroughly explains how the thermoacoustic transfer function causes shifts to low frequencies in both the acoustic pressure spectrum and the final voltage spectrum in TAT. These insights deepen our understanding of optimizing TAT systems in the frequency domain, including aspects like filter design and transducer selection. Furthermore, we underscore the potential significance of this discovery on medical applications, particularly in the context of cancer diagnosis.

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“…In 2014, the Institute of Electrical Engineering, Chinese Academy of Sciences, systematically studied mmtai imaging and obtained the magnetoacoustic signal of low-conductivity medium under low-frequency magnetic fields. At the same time, the group studied the injection current magnetic acoustic imaging technology and realized the low conductivity tissue imaging with a resolution of 0.8 mm [ 18 ]. The Chongqing University examined the magnetic-acoustic effects of metal materials, demonstrating the possibility of magnetic-acoustic imaging [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Research on Forward Problem of Rail Detection Based on Magnetoacoustic Coupling

Huang

Li²,

Huang³

et al. 2022

Sensors

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According to the characteristics of rail defects, a rail microcrack detection method based on magnetoacoustic coupling effect is proposed in this paper. Firstly, the basic principle of a rail microcrack detection method based on magnetoacoustic coupling effect is described, and then the model is analyzed theoretically. Through simulation calculation, the current density distribution and Lorentz force distribution generated by electromagnetic excitation, the motion characteristics of particles under Lorentz force and the sound field distribution characteristics of magnetoacoustic signals generated by Lorentz force are obtained. Finally, an experimental platform was set up and the steel ring model was preliminarily tested. The magnetic and acoustic signals of the two steel ring boundaries excited by an electromagnetic field were collected. These signals correspond to the position distribution of the steel ring. The state change of rail microstructure will cause a change in the conductivity characteristics of rail materials, and will affect the characteristics and distribution of sound pressure in the detection. Therefore, the detection method based on the magnetoacoustic coupling effect can detect the surface microcracks of high-speed rail. This method has great feasibility and development potential in the field of rail flaw detection.

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Experimental Study of Thermo-acoustic Imaging with the Current Injection

Cited by 3 publications

References 7 publications

A Review on the Coupled Method of Using the Magnetic and Acoustic Fields for Biological Tissue Imaging

A Review on the Coupled Method of Using the Magnetic and Acoustic Fields for Biological Tissue Imaging

Mechanism of acoustic pressure spectrum shifting toward lower frequencies in applied current thermoacoustic imaging

Research on Forward Problem of Rail Detection Based on Magnetoacoustic Coupling

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