B1-based SAR reconstruction using contrast source inversion–electric properties tomography (CSI-EPT)

Edmond Balidemaj*, Cornelis A.T. van den Berg, Astrid L.H.M.W. van Lier, Aart J. Nederveen, Lukas J.A. Stalpers, Hans Crezee, Rob F. Remis

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)

Abstract

Specific absorption rate (SAR) assessment is essential for safety purposes during MR acquisition. Online SAR assessment is not trivial and requires, in addition, knowledge of the electric tissue properties and the electric fields in the human anatomy. In this study, the potential of the recently developed CSI-EPT method to reconstruct SAR distributions is investigated. This method is based on integral representations for the electromagnetic field and attempts to reconstruct the tissue parameters and the electric field strength based on B1+ field data only. Full three-dimensional FDTD simulations using a female pelvis model are used to validate two-dimensional CSI reconstruction results in the central transverse plane of a 3T body coil. Numerical experiments demonstrate that the reconstructed SAR distributions are in good agreement with the SAR distributions as determined via 3D FDTD simulations and show that these distributions can be computed very efficiently in the central transverse plane of a body coil with the two-dimensional approach of CSI-EPT.

Original languageEnglish
Pages (from-to)225-233
Number of pages9
JournalMedical & Biological Engineering & Computing
Volume55
Issue number2
DOIs
Publication statusPublished - 1 Feb 2017

Keywords

  • Electric properties tomography (EPT)
  • B1 maps
  • Conductivity
  • Contrast source inversion (CSI)
  • Specific absorption rate (SAR)
  • Electric properties tomography (EPT)

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