Alternate ascending/descending directional navigation approach for imaging magnetization transfer asymmetry

Sung Hong Park, Timothy Q. Duong

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

A new method for imaging magnetization transfer (MT) asymmetry with no separate saturation pulse is proposed in this article. MT effects were generated from sequential two-dimensional balanced steady-state free precession imaging, where interslice MT asymmetry was separated from interslice blood flow and magnetic field inhomogeneity with alternate ascending/descending directional navigation (ALADDIN). Alternate ascending/descending directional navigation provided high-resolution multislice MT asymmetry images within a reasonable imaging time of ∼3 min. MT asymmetry signals measured with alternate ascending/descending directional navigation were 1-2% of baseline signals (N = 6), in agreement with those from the conventional methods. About 70% of MT asymmetry signals were determined by the first prior slice. The frequency offset ranges in this study were >8 ppm from the water resonance frequency, implying that the MT effects were mostly associated with solid-like macromolecules. Potential methods to make alternate ascending/descending directional navigation feasible for imaging amide proton transfer (∼3.5 ppm offset from the water resonance frequency) were discussed.

Original languageEnglish (US)
Pages (from-to)1702-1710
Number of pages9
JournalMagnetic Resonance in Medicine
Volume65
Issue number6
DOIs
StatePublished - Jun 2011

Keywords

  • alternate ascending/descending directional navigation
  • amide proton transfer
  • balanced steady-state free precession
  • chemical exchange saturation transfer
  • magnetization transfer
  • magnetization transfer asymmetry

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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