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Generalized Signal Models and Direct FID-Based Dielectric Parameter Retrieval in MRI.

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Title: Generalized Signal Models and Direct FID-Based Dielectric Parameter Retrieval in MRI.
Authors: Fuchs, Patrick S.1 p.s.fuchs@tudelft.nl, Remis, Rob F.1
Source: IEEE Transactions on Antennas & Propagation. Feb2022, Vol. 70 Issue 2, p1451-1461. 11p.
Subjects: Electric field strength, Magnetic field measurements, Dielectrics, Magnetic resonance imaging, Born approximation
Abstract: In this article, we present full-wave signal models for magnetic and electric field measurements in magnetic resonance imaging (MRI). Our analysis is based on a scattering formalism in which the presence of an object or body is taken into account via an electric scattering source. We show that these signal models can be evaluated, provided that Green’s tensors of the background field are known along with the dielectric parameters of the object and the magnetization within the excited part of the object. Furthermore, explicit signal expressions are derived in the case of a small homogeneous ball that is embedded in free space and for which the quasi-static Born approximation can be applied. The conductivity and permittivity of the ball appear as explicit parameters in the resulting signal models and allow us to study the sensitivity of the measured signals with respect to these dielectric parameters. Moreover, for free induction decay signals, we show through simulations that, under certain conditions, it is possible to retrieve the dielectric parameters of the ball from noise-contaminated induction decay signals that are based on electric or magnetic field measurements. [ABSTRACT FROM AUTHOR]
Copyright of IEEE Transactions on Antennas & Propagation is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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PubType: Academic Journal
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  Data: Generalized Signal Models and Direct FID-Based Dielectric Parameter Retrieval in MRI.
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  Data: <searchLink fieldCode="AR" term="%22Fuchs%2C+Patrick+S%2E%22">Fuchs, Patrick S.</searchLink><relatesTo>1</relatesTo><i> p.s.fuchs@tudelft.nl</i><br /><searchLink fieldCode="AR" term="%22Remis%2C+Rob+F%2E%22">Remis, Rob F.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22IEEE+Transactions+on+Antennas+%26+Propagation%22">IEEE Transactions on Antennas & Propagation</searchLink>. Feb2022, Vol. 70 Issue 2, p1451-1461. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Electric+field+strength%22">Electric field strength</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+field+measurements%22">Magnetic field measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Dielectrics%22">Dielectrics</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+resonance+imaging%22">Magnetic resonance imaging</searchLink><br /><searchLink fieldCode="DE" term="%22Born+approximation%22">Born approximation</searchLink>
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  Data: In this article, we present full-wave signal models for magnetic and electric field measurements in magnetic resonance imaging (MRI). Our analysis is based on a scattering formalism in which the presence of an object or body is taken into account via an electric scattering source. We show that these signal models can be evaluated, provided that Green’s tensors of the background field are known along with the dielectric parameters of the object and the magnetization within the excited part of the object. Furthermore, explicit signal expressions are derived in the case of a small homogeneous ball that is embedded in free space and for which the quasi-static Born approximation can be applied. The conductivity and permittivity of the ball appear as explicit parameters in the resulting signal models and allow us to study the sensitivity of the measured signals with respect to these dielectric parameters. Moreover, for free induction decay signals, we show through simulations that, under certain conditions, it is possible to retrieve the dielectric parameters of the ball from noise-contaminated induction decay signals that are based on electric or magnetic field measurements. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of IEEE Transactions on Antennas & Propagation is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1109/TAP.2021.3111324
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      – Code: eng
        Text: English
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        PageCount: 11
        StartPage: 1451
    Subjects:
      – SubjectFull: Electric field strength
        Type: general
      – SubjectFull: Magnetic field measurements
        Type: general
      – SubjectFull: Dielectrics
        Type: general
      – SubjectFull: Magnetic resonance imaging
        Type: general
      – SubjectFull: Born approximation
        Type: general
    Titles:
      – TitleFull: Generalized Signal Models and Direct FID-Based Dielectric Parameter Retrieval in MRI.
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              Text: Feb2022
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              Y: 2022
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