This title appears in the Scientific Report :
2021
Please use the identifier:
http://hdl.handle.net/2128/27816 in citations.
Please use the identifier: http://dx.doi.org/10.3389/fnins.2021.537666 in citations.
Iterative Restoration of the Fringe Phase (REFRASE) for QSM
Iterative Restoration of the Fringe Phase (REFRASE) for QSM
In quantitative susceptibility mapping (QSM), reconstructed results can be critically biased by misinterpreted or missing phase data near the edges of the brain support originating from the non-local relationship between field and susceptibility. These data either have to be excluded or corrected be...
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Personal Name(s): | Lindemeyer, Johannes |
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Worthoff, Wieland A. / Shymanskaya, Aliaksandra / Shah, N. Jon (Corresponding author) | |
Contributing Institute: |
Physik der Medizinischen Bildgebung; INM-4 Jülich-Aachen Research Alliance - Translational Brain Medicine; JARA-BRAIN Jara-Institut Quantum Information; INM-11 |
Published in: | Frontiers in neuroscience, 15 (2021) S. 537666 |
Imprint: |
Lausanne
Frontiers Research Foundation
2021
|
DOI: |
10.3389/fnins.2021.537666 |
Document Type: |
Journal Article |
Research Program: |
Decoding Brain Organization and Dysfunction |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.3389/fnins.2021.537666 in citations.
In quantitative susceptibility mapping (QSM), reconstructed results can be critically biased by misinterpreted or missing phase data near the edges of the brain support originating from the non-local relationship between field and susceptibility. These data either have to be excluded or corrected before further processing can take place. To address this, our iterative restoration of the fringe phase (REFRASE) approach simultaneously enhances the accuracy of multi-echo phase data QSM maps and the extent of the area available for evaluation. Data loss caused by strong local phase gradients near the surface of the brain support is recovered within the original phase data using harmonic and dipole-based fields extrapolated from a robust support region toward an extended brain mask. Over several iterations, phase data are rectified prior to the application of further QSM processing steps. The concept is successfully validated on numerical phantoms and brain scans from a cohort of volunteers. The increased extent of the mask and improved numerical stability within the segmented globus pallidus confirm the efficacy of the presented method in comparison to traditional evaluation. |