A g-factor metric for k-t SENSE and k-t PCA based parallel imaging.

Binter, Christian; Ramb, Rebecca; Jung, Bernd; Kozerke, Sebastian (2016). A g-factor metric for k-t SENSE and k-t PCA based parallel imaging. Magnetic resonance in medicine, 75(2), pp. 562-571. Wiley 10.1002/mrm.25606

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PURPOSE To propose and validate a g-factor formalism for k-t SENSE, k-t PCA and related k-t methods for assessing SNR and temporal fidelity. METHODS An analytical gxf -factor formulation in the spatiotemporal frequency domain is derived, enabling assessment of noise and depiction fidelity in both the spatial and frequency domain. Using pseudoreplica analysis of cardiac cine data the gxf -factor description is validated and example data are used to analyze the performance of k-t methods for various parameter settings. RESULTS Analytical gxf -factor maps were found to agree well with pseudoreplica analysis for 3x, 5x, and 7x k-t SENSE and k-t PCA. While k-t SENSE resulted in lower average gxf values (gx (avg) ) in static regions when compared with k-t PCA, k-t PCA yielded lower gx (avg) values in dynamic regions. Temporal transfer was better preserved with k-t PCA for increasing undersampling factors. CONCLUSION The proposed gxf -factor and temporal transfer formalism allows assessing noise performance and temporal depiction fidelity of k-t methods including k-t SENSE and k-t PCA. The framework enables quantitative comparison of different k-t methods relative to frame-by-frame parallel imaging reconstruction.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology

UniBE Contributor:

Jung, Bernd


600 Technology > 610 Medicine & health








Karin Hofmann

Date Deposited:

19 Apr 2017 15:08

Last Modified:

19 Apr 2017 15:08

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

g-factor; k-t PCA; k-t SENSE; noise estimation; parallel imaging; temporal filtering





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