Rotational magneto-acousto-electric tomography (MAET): theory and experimental validation

Kunyansky, Leonid; Ingram, Charles P.; Witte, Russell S.

doi:10.1088/1361-6560/aa6222

Cited by 33 publications

(41 citation statements)

References 27 publications

(77 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Let us define uniform computational grids in τ, t, ρ, ψ, and , and assume that extended data g(t,ŷ(ψ)) is sampled on the product grid in t and ψ. We then (42), and finding remaining values using (29).…”

Section: Fast 2d Algorithm and Simulationsmentioning

confidence: 99%

“…Moreover, an inverse source problem of exactly the same form as considered here, also arises in other hybrid modalities. For example, Magnetoacoustoelectric, Acoustoelectric, and Ultrasound modulated optical tomography utilize, as the first step, the so-called synthetic focusing [21,27,29]. This procedure is mathematically equivalent to the above-mentioned problem of PAT/TAT.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Theoretically exact photoacoustic reconstruction from spatially and temporally reduced data

Kunyansky

2018

Inverse Problems

Self Cite

View full text Add to dashboard Cite

We investigate the inverse source problem for the wave equation, arising in photo-and thermoacoustic tomography. There exist quite a few theoretically exact inversion formulas explicitly expressing solution of this problem in terms of the measured data, under the assumption of constant and known speed of sound. However, almost all of these formulas require data to be measured either on an unbounded surface, or on a closed surface completely surrounding the object. This is too restrictive for practical applications. The alternative approach we present, under certain restriction on geometry, yields theoretically exact reconstruction of the standard Radon projections of the source from the data measured on a finite open surface. In addition, this technique reduces the time interval where the data should be known. In general, our method requires a pre-computation of densities of certain single-layer potentials. However, in the case of a truncated circular or spherical acquisition surface, these densities are easily obtained analytically, which leads to fully explicit asymptotically fast algorithms. We test these algorithms in a series of numerical simulations.

show abstract

Section: Fast 2d Algorithm and Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theoretically exact photoacoustic reconstruction from spatially and temporally reduced data

Kunyansky

2018

Inverse Problems

Self Cite

View full text Add to dashboard Cite

show abstract

“…The feasibility of coil structures to detect MAET signals was investigated, but no experimental verification was performed [14]. Kunyansky et al of the University of Arizona proposed a method for reconstructing the conductivity distribution by current density vector, which was validated by simulation [15]. A noninvasive method of treatment-efficacy evaluation for HIFU ablation using the MAET was theoretically studied by Zhou et al The relevant model was established to prove the feasibility of real-time evaluation of HIFU treatment effect by the MAET [16].…”

Section: Introductionmentioning

confidence: 99%

Research on Pneumothorax Detection Based on Magneto-Acousto-Electrical Tomography

Li¹,

Li²,

Liu³

2021

PIER M

View full text Add to dashboard Cite

Pneumothorax can cause chest tightness, chest pain, and respiratory failure, which can be life-threatening in severe cases. Therefore, early diagnosis and treatment of pneumothorax are crucial. Magneto-Acousto-Electrical Tomography (MAET) is an imaging technique in which ultrasound and electromagnetism are mutually coupled. It has the advantages of high spatial resolution and high image contrast. In this paper, we use MAET to study porous and air-containing lung tissue. We first simulate the characteristics of the MAET signal as the degree of pneumothorax increases. The relationship between the size of the ultrasonic probe and the size of the pneumothorax was discussed. The simulation results show that the reflection and attenuation values of the MAET voltage signals increase as the pneumothorax size gradually increases, regardless of whether the ultrasound transducer size is larger or smaller than the pneumothorax size. Finally, the MAET experimental platform was built to validate the simulation results of MAET signals. The results of the experiment and simulation are consistent with each other. The research of this paper has a certain reference value for the detection of pneumothorax using MAET.

show abstract

“…The detection resolution obtained by a 0.5 MHz probe is not good enough. The rotational reconstruction method for deriving the conductivity distributions inside the imaged object was employed to perform an MAET imaging experiment on a circular phantom and meat sample by L. Kunyansk et al in 2017 [29]. However, the improvement of detection resolution was limited.…”

Section: Introductionmentioning

confidence: 99%

Research on Factors Affecting the Imaging Resolution of Magneto–Acousto–Electrical Tomography

Dai

Sun

et al. 2020

IEEE Access

View full text Add to dashboard Cite

As the conductivities of healthy tissue and cancerous tissue are different, methods for detecting conductivity variations of biological tissue are potential medical imaging modalities for early diagnosis of cancer in the future. Magneto-acousto-electrical tomography (MAET) is a noninvasive and hybrid conductivity imaging technology that integrates the advantage of high contrast. It has been demonstrated to have an excellent capability to distinguish conductivity variations along the direction of acoustic propagation and extremely promising as an alternative medical imaging technology for early detection of cancer. However, the existing MAET has a low resolution, and the factors affecting the imaging resolution of MAET are rarely studied systematically. Therefore, we firstly designed an MAET detection system and performed several verification experiments. A B-scan algorithm was then proposed for enhancing the system resolution. Subsequently, two uniform phantoms with different intermediate gaps in the middle and a B-mode imaging experiment on pork tissue were used for testing the performance of detection resolution. Finally, comparative analyses were performed to verify whether the frequency, the cycle number of the excitation signal, and the B-scan algorithm can influence the detection resolution. We obtained the following results: 1) The longitudinal resolution of the conductivity B-scan image increases as the number of cycle excitation decreases. 2) Vertical resolution using a 2.5 MHz probe excitation is significantly better than using a 500 kHz probe excitation. 3) The B-scan algorithm can improve conductivity resolution, and it reveals that our proposed detection system's longitudinal resolution can reach 1mm. 4) we obtained the conductivity profile of pork tissue. The results showed that our detection platform could accurately distinguish the target sample's interfaces of conductivity variations, increasing the excitation frequency, reducing the cycle number, and adopting the B-mode imaging algorithm could improve its conductivity detection resolution, which laid the foundation for the design of a high-resolution MAET detection system.

show abstract

Rotational magneto-acousto-electric tomography (MAET): theory and experimental validation

Cited by 33 publications

References 27 publications

Theoretically exact photoacoustic reconstruction from spatially and temporally reduced data

Theoretically exact photoacoustic reconstruction from spatially and temporally reduced data

Research on Pneumothorax Detection Based on Magneto-Acousto-Electrical Tomography

Research on Factors Affecting the Imaging Resolution of Magneto–Acousto–Electrical Tomography

Contact Info

Product

Resources

About