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.
How to access this content:
For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.
After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.
After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.
Click here for more information on becoming a member.
