Ramb, Rebecca; Binter, Christian; Schultz, Gerrit; Assländer, Jakob; Breuer, Felix; Zaitsev, Maxim; Kozerke, Sebastian; Jung, Bernd (2014). A g-factor metric for k-t-GRAPPA- and PEAK-GRAPPA-based parallel imaging. Magnetic resonance in medicine, 74(1), pp. 125-135. Wiley-Liss 10.1002/mrm.25386
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PURPOSE
The aim of this work is to derive a theoretical framework for quantitative noise and temporal fidelity analysis of time-resolved k-space-based parallel imaging methods.
THEORY
An analytical formalism of noise distribution is derived extending the existing g-factor formulation for nontime-resolved generalized autocalibrating partially parallel acquisition (GRAPPA) to time-resolved k-space-based methods. The noise analysis considers temporal noise correlations and is further accompanied by a temporal filtering analysis.
METHODS
All methods are derived and presented for k-t-GRAPPA and PEAK-GRAPPA. A sliding window reconstruction and nontime-resolved GRAPPA are taken as a reference. Statistical validation is based on series of pseudoreplica images. The analysis is demonstrated on a short-axis cardiac CINE dataset.
RESULTS
The superior signal-to-noise performance of time-resolved over nontime-resolved parallel imaging methods at the expense of temporal frequency filtering is analytically confirmed. Further, different temporal frequency filter characteristics of k-t-GRAPPA, PEAK-GRAPPA, and sliding window are revealed.
CONCLUSION
The proposed analysis of noise behavior and temporal fidelity establishes a theoretical basis for a quantitative evaluation of time-resolved reconstruction methods. Therefore, the presented theory allows for comparison between time-resolved parallel imaging methods and also nontime-resolved methods. Magn Reson Med, 2014. © 2014 Wiley Periodicals, Inc.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology |
UniBE Contributor: |
Jung, Bernd |
Subjects: |
600 Technology > 610 Medicine & health |
ISSN: |
0740-3194 |
Publisher: |
Wiley-Liss |
Language: |
English |
Submitter: |
Aisha Stefania Mzinga |
Date Deposited: |
01 May 2015 15:35 |
Last Modified: |
05 Dec 2022 14:45 |
Publisher DOI: |
10.1002/mrm.25386 |
PubMed ID: |
25043689 |
Uncontrolled Keywords: |
PEAK-GRAPPA; g-factor; k-t-GRAPPA; noise enhancement; pseudoreplica |
BORIS DOI: |
10.7892/boris.66864 |
URI: |
https://boris.unibe.ch/id/eprint/66864 |
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