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DC artifact correction for arbitrary phase-cycling sequence.

Paul Kyu Han1, HyunWook Park2, Sung-Hong Park1

  • 1Magnetic Resonance Imaging Laboratory, Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea.

Magnetic Resonance Imaging
|December 22, 2016
PubMed
Summary
This summary is machine-generated.

A new technique effectively corrects direct current (DC) artifacts in magnetic resonance imaging (MRI) across various phase-cycling sequences. This method ensures clearer MR images by removing unwanted bright spots caused by baseline signal offsets.

Keywords:
DC artifactPhase cyclingbSSFP

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Signal Processing

Background:

  • Direct current (DC) artifacts in magnetic resonance imaging (MRI) manifest as bright spots or lines, originating from receiver baseline signal offsets.
  • Existing DC artifact correction methods are often incompatible with specific phase-cycling techniques used in MRI sequences.

Purpose of the Study:

  • To develop a novel and universally applicable technique for correcting DC artifacts in MRI.
  • To enable DC artifact removal in imaging sequences employing arbitrary phase-cycling strategies.

Main Methods:

  • A three-step technique involving phase unification, DC offset estimation and correction, and phase restoration was proposed.
  • The method's efficacy was validated using phantom and in vivo experiments.
  • Balanced steady-state free precession (bSSFP) imaging sequences with multiple phase-cycling angles were utilized.

Main Results:

  • Successful removal of DC artifacts was achieved in MR images.
  • The technique demonstrated effectiveness with bSSFP sequences using phase-cycling angles of 0°, 90°, 180°, and 270°.
  • The proposed method showed potential for broad applicability across diverse imaging sequences.

Conclusions:

  • The developed technique offers a simple and effective solution for DC artifact correction in MRI.
  • This method is compatible with arbitrary phase-cycling imaging sequences, enhancing image quality.
  • The findings suggest widespread utility for the proposed DC artifact correction technique in various MRI applications.