Joint image reconstruction and motion parameter estimation for free-breathing navigator-gated cardiac mri

Mehmet Akçakaya, Tamer A. Basha, Sebastian Weingärtner, Reza Nezafat

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We propose an acquisition and reconstruction technique for accelerated free-breathing cardiac MRI acquisitions. For the acquisition, a random undersampling pattern, including a fully-sampled center of k-space, is generated prospectively. The k-space lines specified by this undersampling pattern is acquired with respiratory navigating (NAV), where only the central k-space lines are acquired within the pre-specified gating window. For the outer k-space lines, if the NAV signal corresponding to a k-space segment is outside the gating window, the segment is rejected, but not re-acquired. The reconstruction approach jointly estimates the underlying image using a compressed-sensing based approach, and the translational motion parameters for each segment for the outer k-space segments acquired outside the gating window. The feasibility of the approach is demonstrated in healthy adult subjects using whole-heart coronary MRI with a 3-fold accelerated random undesampling pattern. The proposed acquisition and reconstruction technique is compared to parallel imaging with uniform undersampling with 3-fold undersampling. The two techniques exhibit similar image quality with a shorter acquisition time for the proposed approach (4: 25±0: 31 minutes versus 6: 52±0: 19).

Original languageEnglish (US)
Title of host publicationWavelets and Sparsity XV
DOIs
StatePublished - Dec 9 2013
EventWavelets and Sparsity XV - San Diego, CA, United States
Duration: Aug 26 2013Aug 29 2013

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8858
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceWavelets and Sparsity XV
CountryUnited States
CitySan Diego, CA
Period8/26/138/29/13

Keywords

  • Accelerated imaging
  • Cardiac MRI
  • Compressed sensing
  • Diaphragmatic navigators
  • Image reconstruction
  • Magnetic resonance imaging
  • Motion correction
  • Parameter estimation

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