k-TE Generalized Autocalibrating Partially Parallel Acquisition (GRAPPA) for accelerated Multiple Gradient-Recalled Echo (MGRE) R2* mapping in the abdomen

Xiaoming Yin, Andrew C. Larson

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Multiple gradient-recalled echo (MGRE) methods are commonly used for abdominal R2* mapping. Accelerated MGRE acquisitions would offer the potential to shorten requisite breathhold times and/or increase spatial resolution and coverage. In both phantom and normal volunteer studies, view-sharing (VS) methods, generalized autocalibrating partially parallel acquisition (GRAPPA) methods, and newly proposed k-echo time (k-TE) GRAPPA methods were compared for the purpose of accelerating MGRE acquisitions. Utilization of water-selective spatial spectral excitation pulses reduced artifact levels for both VS and k-TE GRAPPA approaches. VS approaches were found to be highly sensitive to off-resonance effects, particularly at increasing acceleration rates. k-TE GRAPPA significantly reduced residual artifact levels compared to GRAPPA approaches while improving the accuracy of accelerated abdominal R2* measurements. These initial feasibility studies demonstrate that k-TE GRAPPA is an effective method to reduce scan times during abdominal R2*-mapping procedures.

Original languageEnglish (US)
Pages (from-to)507-516
Number of pages10
JournalMagnetic resonance in medicine
Volume61
Issue number3
DOIs
StatePublished - Mar 2009

Keywords

  • Abdominal imaging
  • Multiple gradient echo
  • Partial parallel imaging
  • R* mapping
  • k-TE GRAPPA

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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