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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2021-05-11
Transverse-EPT: A Local First Order Electrical Properties Tomography Approach Not Requiring Estimation of the Incident Fields
By
Reijer Leijsen,

    Dr. Reijer Leijsen

    Leiden University Medical Center

    The Netherlands

    Homepage

Wyger Brink,

    Dr. Wyger Brink

    Leiden University Medical Center

    The Netherlands

    Homepage

Xin An,

    Dr. Xin An

    Delft University of Technology

    The Netherlands

    Homepage

Andrew Webb,

    Prof. Andrew Webb

    Department of Radiology

    Leiden University Medical Center

    Netherlands

    Homepage

Rob F. Remis

    Dr. Rob F. Remis

    Delft University of Technology

    Netherlands

    Homepage

Progress In Electromagnetics Research M, Vol. 102, 137-148, 2021
doi:10.2528/PIERM21021006 | Google Scholar

Abstract
A new local method for magnetic resonance electrical properties tomography (EPT), dubbed transverse-EPT (T-EPT), is introduced. This approach iteratively optimizes the dielectric properties (conductivity and permittivity) and the z-component of the electric field strength, exploiting the locally E-polarized field structure typically present in the midplane of a birdcage radiofrequency (RF) coil. In contrast to conventional Helmholtz-based EPT, T-EPT does not impose homogeneity assumptions on the object, and requires only first order differences, which makes the method more accurate near tissue boundaries and more noise robust. Additionally, in contrast to integral equation-based approaches, estimation of the incident fields is not required. The EPT approach is derived from Maxwell's equations and evaluated on simulated data of a realistic tuned RF coil model to demonstrate its potential.
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Citation
Reijer Leijsen, Wyger Brink, Xin An, Andrew Webb, and Rob F. Remis, "Transverse-EPT: A Local First Order Electrical Properties Tomography Approach Not Requiring Estimation of the Incident Fields," Progress In Electromagnetics Research M, Vol. 102, 137-148, 2021.
doi:10.2528/PIERM21021006
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