| Title: |
Transceive phase corrected 2D contrast source inversion-electrical properties tomography |
| Authors: |
Stijnman, Peter RS; Mandija, Stefano; Fuchs, Patrick S; van den Berg, Cornelis AT; Remis, Rob F |
| Source: |
Magnetic Resonance in Medicine , 85 (5) pp. 2856-2868. (2021) |
| Publisher Information: |
Wiley-Blackwell |
| Publication Year: |
2021 |
| Collection: |
University College London: UCL Discovery |
| Subject Terms: |
contrast source inversion; dielectric tissue mapping; electrical properties tomography; EPT; MRI; RF-shield; transceive phase |
| Description: |
Purpose: To remove the necessity of the tranceive phase assumption for CSI-EPT and show electrical properties maps reconstructed from measured data obtained using a standard 3T birdcage body coil setup. / Methods: The existing CSI-EPT algorithm is reformulated to use the transceive phase rather than relying on the transceive phase assumption. Furthermore, the radio frequency (RF)-shield is numerically implemented to accurately model the RF fields inside the MRI scanner. We verify that the reformulated two-dimensional (2D) CSI-EPT algorithm can reconstruct electrical properties maps given 2D electromagnetic simulations. Afterward, the algorithm is tested with three-dimensional (3D) FDTD simulations to investigate if the 2D CSI-EPT can retrieve the electrical properties for 3D RF fields. Finally, an MR experiment at 3T with a phantom is performed. / Results: From the results of the 2D simulations, it is seen that CSI-EPT can reconstruct the electrical properties using MRI accessible quantities. For 3D simulations, it is observed that the electrical properties are underestimated, nonetheless, CSI-EPT has a lower standard deviation than the standard Helmholtz based methods. Finally, the first CSI-EPT reconstructions based on measured data are presented showing comparable accuracy and precision to reconstructions based on simulated data, and demonstrating the feasibility of CSI-EPT. / Conclusions: The CSI-EPT algorithm was rewritten to use MRI accessible quantities. This allows for CSI-EPT to fully exploit the benefits of the higher static magnetic field strengths with a standard quadrature birdcage coil setup. |
| Document Type: |
article in journal/newspaper |
| File Description: |
text |
| Language: |
English |
| Relation: |
https://discovery.ucl.ac.uk/id/eprint/10169521/ |
| Availability: |
https://discovery.ucl.ac.uk/id/eprint/10169521/1/Transceive%20phase%20corrected%202D%20contrast%20source%20inversion-electrical%20properties%20tomography.pdf; https://discovery.ucl.ac.uk/id/eprint/10169521/ |
| Rights: |
open |
| Accession Number: |
edsbas.24334EDB |
| Database: |
BASE |