Developments in electrical-property tomography based on the contrast-source inversion method
R.L. Leijsen (Leiden University Medical Center)
P.S. Fuchs (TU Delft - Signal Processing Systems)
W. Brink (Leiden University Medical Center)
Andrew Webb (Leiden University Medical Center)
Rob Remis (TU Delft - Signal Processing Systems)
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Abstract
The main objective of electrical-property tomography (EPT) is to retrieve dielectric tissue parameters from B
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data as measured by a magnetic-resonance (MR) scanner. This is a so-called hybrid inverse problem in which data are defined inside the reconstruction domain of interest. In this paper, we discuss recent and new developments in EPT based on the contrast-source inversion (CSI) method. After a short review of the basics of this method, two- and three-dimensional implementations of CSI-EPT are presented along with a very efficient variant of 2D CSI-EPT called first-order induced current EPT (foIC-EPT). Practical implementation issues that arise when applying the method to measured data are addressed as well, and the limitations of a two-dimensional approach are extensively discussed. Tissue-parameter reconstructions of an anatomically correct male head model illustrate the performance of two- and three-dimensional CSI-EPT. We show that 2D implementation only produces reliable reconstructions under very special circumstances, while accurate reconstructions can be obtained with 3D CSI-EPT.
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