Selective suppression of artifact-generating echoes in cine DENSE using through-plane dephasing

Xiaodong Zhong, Bruce S. Spottiswoode, Elizabeth A. Cowart, Wesley D. Gilson, Frederick H. Epstein

Research output: Contribution to journalArticlepeer-review

Abstract

In displacement-encoded imaging with stimulated echoes (DENSE), tissue displacement is encoded in the phase of the stimulated echo. However, three echoes generally contribute to the acquired signal (the stimulated echo, the complex conjugate of the stimulated echo, and an echo due to T1 relaxation). It is usually desirable to suppress all except the stimulated echo, since otherwise the additional echoes will cause displacement measurement errors. Ideally, suppression of the artifact-generating echoes would be independent of time, T1, and displacement-encoding frequency, and would not require additional acquisitions. In this study through-plane gradients were used to selectively dephase artifact-generating echoes without causing significant signal loss of the stimulated echo. A cine DENSE sequence was modified to include dephasing gradients and perform complementary spatial modulation of magnetization (CSPAMM). For single-acquisition cine DENSE using dephasing alone, artifact suppression was similar to CSPAMM with two acquisitions. The use of dephasing with CSPAMM required two acquisitions, but demonstrated greater artifact suppression than CSPAMM alone or dephasing alone.

Original languageEnglish (US)
Pages (from-to)1126-1131
Number of pages6
JournalMagnetic Resonance in Medicine
Volume56
Issue number5
DOIs
StatePublished - Nov 2006
Externally publishedYes

Keywords

  • Artifact suppression
  • Cardiac
  • DENSE
  • MRI
  • Stimulated echo

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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