Accelerated cardiac T2 mapping using breath-hold multiecho fast spin-echo pulse sequence with k-t FOCUSS

Li Feng, Ricardo Otazo, Hong Jung, Jens H. Jensen, Jong C. Ye, Daniel K. Sodickson, Daniel Kim*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

Cardiac T2 mapping is a promising method for quantitative assessment of myocardial edema and iron overload. We have developed a new multiecho fast spin echo (ME-FSE) pulse sequence for breath-hold T2 mapping with acceptable spatial resolution. We propose to further accelerate this new ME-FSE pulse sequence using k-t focal underdetermined system solver adapted with a framework that uses both compressed sensing and parallel imaging (e.g., sensitivity encoding) to achieve higher spatial resolution. We imaged 12 control subjects in midventricular short-axis planes and compared the accuracy of T2 measurements obtained using ME-FSE with generalized autocalibrating partially parallel acquisitions and ME-FSE with k-t focal underdetermined system solver. For image reconstruction, we used a bootstrapping two-step approach, where in the first step fast Fourier transform was used as the sparsifying transform and in the final step principal component analysis was used as the sparsifying transform. When compared with T2 measurements obtained using generalized autocalibrating partially parallel acquisitions, T2 measurements obtained using k-t focal underdetermined system solver were in excellent agreement (mean difference = 0.04 msec; upper/lower 95% limits of agreement were 2.26/-2.19 msec, respectively). The proposed accelerated ME-FSE pulse sequence with k-t focal underdetermined system solver is a promising investigational method for rapid T2 measurement of the heart with relatively high spatial resolution (1.7 Ã - 1.7 mm2). Magn Reson Med, 2011.

Original languageEnglish (US)
Pages (from-to)1661-1669
Number of pages9
JournalMagnetic resonance in medicine
Volume65
Issue number6
DOIs
StatePublished - Jun 2011

Keywords

  • MRI
  • compressed sensing
  • heart
  • k-t FOCUSS
  • multiecho FSE
  • parallel imaging

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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