Christian Binter1,
Rebecca Ramb2, Bernd Jung3, Sebastian Kozerke1,
4
1Institute
for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland; 2Dept.
of Radiology, Medical Physics , University Medical Center , Freiburg,
Germany; 3Dept. of Radiology, Medical Physics , University Medical
Center, Freiburg, Germany; 4Imaging Sciences and Biomedical
Engineering, King's College London, London, United Kingdom
Spatiotemporal undersampling methods allow for significant speed-up of image acquisition. This work aims at providing an analytical assessment of noise behavior and temporal fidelity of k-t SENSE and k-t PCA. The g-factor formalism introduced for parallel imaging (SENSE, GRAPPA) is extended to the temporal frequency domain. Using in-vivo data it is demonstrated that the proposed g-factor shows good agreement with results obtained by pseudo-replica analysis for both k-t SENSE and k-t PCA, and also matches the temporal transfer function for k-t SENSE.
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