Dynamic correction of artifacts due to susceptibility effects and time-varying eddy currents in diffusion tensor imaging

Trong Kha Truong, Nan kuei Chen, Allen W. Song

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

In diffusion tensor imaging (DTI), spatial and temporal variations of the static magnetic field (B 0) caused by susceptibility effects and time-varying eddy currents result in severe distortions, blurring, and misregistration artifacts, which in turn lead to errors in DTI metrics and in fiber tractography. Various correction methods have been proposed, but typically assume that the eddy current-induced magnetic field can be modeled as a constant or a single exponential decay within the DTI readout window. Here, we show that its temporal dependence is more complex because of the interaction of multiple eddy currents with different time constants, but that it remains very consistent over time. As such, we propose a novel dynamic B 0 mapping and off-resonance correction method that measures the exact spatial, temporal, and diffusion-weighting direction dependence of the susceptibility- and eddy current-induced magnetic fields to effectively and efficiently correct for artifacts caused by both susceptibility effects and time-varying eddy currents, thereby resulting in a high spatial fidelity and accuracy.

Original languageEnglish (US)
Pages (from-to)1343-1347
Number of pages5
JournalNeuroImage
Volume57
Issue number4
DOIs
StatePublished - Aug 15 2011
Externally publishedYes

Keywords

  • Artifact correction
  • Diffusion tensor imaging
  • Dynamic
  • Eddy currents
  • Magnetic field mapping
  • Susceptibility

ASJC Scopus subject areas

  • Neurology
  • Cognitive Neuroscience

Fingerprint

Dive into the research topics of 'Dynamic correction of artifacts due to susceptibility effects and time-varying eddy currents in diffusion tensor imaging'. Together they form a unique fingerprint.

Cite this