Abstract #3315
Removal of Background Fields with Spatially Variable Kernel Radii Guided by the Frequency-Offset-Gradient (FOG) Magnitude
PINAR SENAY ZBAY 1,2 , Cristina Rossi 1 , Klaas Paul Prssmann 2 , and Daniel Nanz 1
1
Department of Radiology, University Hospital
Zrich, Zrich, Switzerland,
2
Institute
of Biomedical Engineering, ETH Zrich, Zrich,
Switzerland
The calculation of quantitative susceptibility maps,
QSM, requires removal of non-local fields, e.g., via a
convolution of a phase map with a Laplacian-kernel,
multiplication with an eroded-binary-tissue-mask, and
deconvolution. While erosion of the tissue-mask improves
QSM image quality, valuable information is lost. The
goal of this study was to regionally vary the size of
the Laplacian convolution kernel based on the magnitude
of the Frequency-Offset-Gradient-(FOG), which tends to
be higher in regions close to the cavities, where
air-tissue-susceptibility-artifacts are severe.
Susceptibility-maps calculated with the variable-kernel
approach revealed less-artifact, and gave more realistic
information around the brain-tissue close to the
cavities.
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