Limitations of 2-D Field Structure Assumptions in Electrical Properties Tomography and its 3-D CSI-EPT Solution

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Abstract

CSI-EPT is an Electrical Properties Tomography (EPT) reconstruction method that uses a Contrast Source Inversion (CSI) optimization approach to retrieve the conductivity and permittivity profiles of tissue based on -data. The method can handle variations in tissue profiles and was originally implemented for profile reconstructions in the midplane of a birdcage coil, where the RF field exhibits an E-polarized field structure [1]. Recently, CSI-EPT has been extended to a fully 3-D volumetric reconstruction method that is generally applicable (in- or outside the midplane) and no particular field structure or smoothness is assumed [2]. This is a major step towards turning CSI-EPT into a practical reconstruction method. Unfortunately, the computation times significantly increase (hours or even days, depending on the reconstruction domain of interest) and from this point of view a 2-D approach may be preferable. We show, however, that a 2-D approach is only warranted under very specific circumstances and having an E-polarized field structure is a necessary but not sufficient condition. In particular, we show that to obtain accurate tissue reconstructions based on 3-D -data, it is in general necessary to take all electromagnetic field components into account and a 2-D reconstruction approach will lead to reconstruction artefacts.
Original languageEnglish
Title of host publication2nd International Workshop on MR-based Electrical Properties Tomography
Subtitle of host publicationMarch 13th-16th 2019 University Medical Center Utrecht The Netherlands
Number of pages2
Publication statusPublished - 2019
Event2nd International Workshop on MR-based
Electrical Properties Tomography
- Utrecht, Netherlands
Duration: 13 Mar 201916 Mar 2019
Conference number: 2

Workshop

Workshop2nd International Workshop on MR-based
Electrical Properties Tomography
Abbreviated titleIMEP 2019
CountryNetherlands
CityUtrecht
Period13/03/1916/03/19

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