Image quality improvement of magneto-acousto-electrical tomography with Barker coded excitation

Deng, Dingqian; Sun, T.; Yu, Linguo; Chen, Yi; Chen, Xin; Chen, Mian; Chen, Siping; Lin, Haoming

doi:10.1016/j.bspc.2022.103823

Cited by 12 publications

(3 citation statements)

References 20 publications

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“…To reconstruct conductivity images of irregular objects, this team proposed an approach with multi-angle scanning, and the relationship between the reconstruction error and number of angles was also presented, demonstrating that an optimal reconstruction can be achieved at 12 angles [53][54] . The team also conducted the Baker encoding excitation system, and achieved isolated tissue imaging [55] . Under the excitation of a non-uniform static magnetic field, Li et al [56] established an experimental platform and reconstructed the distribution of phantom conductivity according to the MAET theory based on the reciprocity theorem.…”

Section: Fig 5 Conductivity Gradient Image Of Maetmentioning

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: Fig 5 Conductivity Gradient Image Of Maetmentioning

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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“…Zhang et al compared the imaging performance of 5, 7, 11, and 13 bit Barker codes in MAET and demonstrated that the imaging signal-to-noise ratio (SNR) improved by 21.5 dB when samples were excited by 13 bit Barker-coded ultrasound (Zhang et al 2018). Deng et al used a 13 bit Barker code with a center frequency of 1 MHz in MAET to image the agar gel phantom and the pork sample and achieved the same contrast-to-noise ratio (CNR) as the spike ultrasound excitation but used fewer number of coherent addition (Deng et al 2022). Sun et al combined one-dimensional (1D) ultrasound excitation and 13 bit Barker coded-excitation in MAET and succeed in identifying the electrical conductivity gradients in three-dimensional (3D) space (Sun et al 2023).…”

Section: Introductionmentioning

confidence: 99%

Magneto-acousto-electrical tomography using nonlinearly frequency-modulated ultrasound

Cheng,

Sun,

Wang

et al. 2024

Phys. Med. Biol.

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In this study, nonlinearly frequency-modulated (NLFM) ultrasound was applied to magneto-acousto-electrical tomography (MAET) to increase the dynamic range of detection. Generation of NLFM signals using window function method – based on the principle of stationary phase – and piecewise linear frequency modulation method – based on the genetic algorithm – was discussed. The MAET experiment systems using spike, linearly frequency-modulated (LFM), or NLFM pulse stimulation were constructed, and three groups of MAET experiments on saline agar phantom samples were carried out to verify the performance – respectively the sensitivity, the dynamic range, and the longitudinal resolution of detection – of MAET using NLFM ultrasound in comparison to that using LFM ultrasound. Based on the above experiments, a pork sample was imaged by ultrasound imaging method, spike MAET method, LFM MAET method, and NLFM MAET method, to compare the imaging accuracy. The experiment results showed that, through sacriﬁcing very little main-lobe width of pulse compression or equivalently the longitudinal resolution, the MAET using NLFM ultrasound achieved higher signal-to-interference ratio (and therefore higher detection sensitivity), lower side-lobe levels of pulse compression (and therefore larger dynamic range of detection), and large anti-interference capability, compared to the MAET using LFM ultrasound. The applicability of the MAET using NLFM ultrasound was proved in circumferences where sensitivity and dynamic range of detection were mostly important and slightly lower longitudinal resolution of detection was acceptable. The study furthered the scheme of using coded ultrasound excitation toward the clinical application of MAET.

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“…Li et al used MAET to detect neocrown pneumonia and reconstructed B-scan images by simulating a pre-pulmonary edema or solid lung model and a complete pulmonary edema or solid lung model [24]. Deng et al improved imaging sensitivity of MAET with Barker coding excitation and reconstructed images of 0.16 S/m phantom and isolated pork tissue in 0.77 T static magnetic field [25]. Li et al changed the ultrasonic cyclotron radiation pattern and the tilt angle of the conductivity boundary to improve the distortion problem of MAET and verified the findings by applying B-mode to reconstructed images of 1 S/m phantom in experiments [26].…”

Section: Introductionmentioning

confidence: 99%

Magneto-Acousto-Electrical Tomography Based on Synthetic Aperture with Inhomogeneous Static Magnetic Field

Bu,

Zhang,

et al. 2024

PIER M

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Magneto-acousto-electrical tomography (MAET) is an imaging method generating a source current under the excitation of both static magnetic field and acoustic field, and electrodes are used to detect the electrical signal to further reconstruct conductivity image. Previous studies ignored the non-uniformity of magnetic field. However, the reconstructed image will introduce artifacts due to magnetic field inhomogeneity, which is small but cannot be neglected. We analyzed the characteristics of magneto-acousto-electrical signal under uniform and inhomogeneous magnetic fields in simulation. This paper deduces the relation of magneto-acoustic signal generated by inhomogeneous static magnetic field and reconstructed conductivity image under nonuniform static magnetic field through synthetic aperture imaging. Furthermore, to verify the validity of the theory, an experimental platform was built to reconstruct the conductivity of phantom. In clinical applications, nonuniform static magnetic field can achieve a fully open magnetic field structure, which is much more friendly for the inspection of patients with autism and even children. Permanent magnets that generate nonuniform static magnetic fields have the advantages of smaller size, lighter weight, and lower cost than magnets that generate uniform static magnetic field, which can effectively optimize equipment space.

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Image quality improvement of magneto-acousto-electrical tomography with Barker coded excitation

Cited by 12 publications

References 20 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

Magneto-acousto-electrical tomography using nonlinearly frequency-modulated ultrasound

Magneto-Acousto-Electrical Tomography Based on Synthetic Aperture with Inhomogeneous Static Magnetic Field

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