Experimental confirmation of phase encoding of instantaneous derivatives of position

Jeffrey L. Duerk, Orlando P. Simonetti, Gregory C. Hurst, Daniel A. Finelli

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Previous theoretical reports described the dependence of interpretation of the observed phase of the NMR signal on the time origin(s) of moment calculations and position's Taylor series expansion. This work provides experimental confirmation of predictions derived from that theory. For accelerative motion, experimental phase‐encoded velocity measurements give instantaneous values at a time corresponding to the origin used for waveform momemt calculations. For laminar flow, experimental intensity profiles agree well with theoretical simulations; new findings extend amplitude and spatial distributions of oblique flow profiles beyond previous descriptions. Experiments using sequences with controlled position of the time origins for phase and read axes show that displacement and motion artifacts are reduced when they're coincident (pulsed flow, nongated acquisitions), and virtually eliminated when combined with gating. Potentially significant clinical consequences of coincident and noncoincident time origins are demonstrated in human head MIP MRA images. These results have fundamental implications in waveform design.

Original languageEnglish (US)
Pages (from-to)77-87
Number of pages11
JournalMagnetic Resonance in Medicine
Volume32
Issue number1
DOIs
StatePublished - Jul 1994
Externally publishedYes

Keywords

  • derivatives
  • moments
  • motion
  • MRI

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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