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Reduction of ringing artifacts in the arterial phase of gadoxetic acid-enhanced dynamic MR imaging

Akihiro Tanimoto1, Nobuya Higuchi, Akihisa Ueno

  • 1Department of Diagnostic Radiology, Keio University School of Medicine, Tokyo, Japan. t-mri@tt.rim.or.jp

Magnetic Resonance in Medical Sciences : MRMS : an Official Journal of Japan Society of Magnetic Resonance in Medicine
|July 14, 2012
PubMed
Abstract

Insights

Optimizing magnetic resonance (MR) imaging for gadoxetic acid-enhanced dynamic scans involves adjusting parameters to reduce ringing artifacts. Using square matrices, shorter scan times, and slower contrast injection rates significantly minimizes these visual disruptions.

Area of Science:

  • Radiology
  • Medical Imaging
  • Magnetic Resonance Imaging

Background:

  • Ringing artifacts can degrade image quality in dynamic contrast-enhanced MR imaging.
  • Gadoxetic acid-enhanced dynamic MR imaging is crucial for liver lesion characterization.
  • Minimizing artifacts is essential for accurate diagnostic interpretation.

Purpose of the Study:

  • To identify key magnetic resonance (MR) imaging parameters influencing ringing artifacts.
  • To evaluate the impact of different imaging parameters on artifact severity during the arterial phase of gadoxetic acid-enhanced dynamic MR imaging.

Main Methods:

  • Utilized novel simulation software for parameter testing.
  • Assessed imaging matrices, phase-encoding schemes (sequential vs. elliptical centric), scanning time, and contrast injection rates.
  • Retrospectively evaluated clinical MR images using a 4-point scale for artifact assessment.

Main Results:

  • Simulation and clinical studies confirmed that square matrices, shorter scanning times, slower contrast injection rates, and sequential view ordering reduce ringing artifacts.
  • A slow injection rate significantly decreased artifacts (P<0.05).
  • Square matrices demonstrated significant artifact reduction across arterial (P<0.05), portal (P<0.01), and hepatocytic (P<0.05) phases.

Conclusions:

  • Square matrix selection is effective in reducing ringing artifacts.
  • Slower contrast injection rates and shorter scanning times contribute to artifact mitigation.
  • Sequential view ordering can also help minimize ringing artifacts in gadoxetic acid-enhanced dynamic MR imaging.

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