Fast four-dimensional coronary MR angiography with k-t GRAPPA

Peng Lai, Feng Huang, Andrew C. Larson, Debiao Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Purpose: To investigate the effectiveness of k-t GRAPPA for accelerating four-dimensional (4D) coronary MRA in comparison with GRAPPA and the feasibility of combining variable density undersampling with conventional k-t GRAPPA (k-t2 GRAPPA) to alleviate the overhead of acquiring autocalibration signals. Materials and Methods: The right coronary artery of nine healthy volunteers was scanned at 1.5 Tesla. The 4D k-space datasets were fully acquired and subsequently undersampled to simulate partially parallel acquisitions, namely, GRAPPA, k-t GRAPPA, and k-t2 GRAPPA. Comparisons were made between the images reconstructed from full k-space datasets and those reconstructed from undersampled k-space datasets. Results: k-t GRAPPA significantly reduced artifacts compared with GRAPPA and high acceleration factors were achieved with only minimal sacrifices in vessel depiction. k-t 2 GRAPPA could further increase imaging speed without significant losses in image quality. Conclusion: By exploiting high-degree spatiotemporal correlations during the rest period of a cardiac cycle, k-t GRAPPA and k-t 2 GRAPPA can greatly increase data acquisition efficiency and, therefore, are promising solutions for fast 4D coronary MRA.

Original languageEnglish (US)
Pages (from-to)659-665
Number of pages7
JournalJournal of Magnetic Resonance Imaging
Volume27
Issue number3
DOIs
StatePublished - Mar 2008

Keywords

  • 4D coronary MRA
  • Fast imaging
  • k-t GRAPPA

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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