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Quantifying Mixing using Magnetic Resonance Imaging
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Effect of metallic materials on magnetic resonance image uniformity: a quantitative experimental study.

Hiroaki Shimamoto1, Doaa Felemban2, Yuka Uchimoto3

  • 1Department of Oral and Maxillofacial Radiology, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan. shimamoto.hiroaki.dent@osaka-u.ac.jp.

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|October 15, 2024
PubMed
Summary
This summary is machine-generated.

Metallic materials like cobalt-chromium (Co-Cr) and titanium (Ti) can significantly reduce magnetic resonance (MR) image uniformity, particularly with gradient echo sequences. This effect is attributed to their high magnetic susceptibility.

Keywords:
Image uniformityMRIMetallic materialsQuantitative study

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Area of Science:

  • Medical Imaging
  • Materials Science
  • Biomedical Engineering

Background:

  • Metallic materials are increasingly used in medical devices, raising concerns about their impact on Magnetic Resonance (MR) imaging.
  • Assessing the effect of metallic implants on MR image quality is crucial for accurate diagnosis and treatment planning.

Purpose of the Study:

  • To quantitatively evaluate the influence of various metallic materials on MR image uniformity using a standardized methodology.
  • To identify specific metallic materials that degrade MR image quality.

Main Methods:

  • Six types of 1 cm cubic metallic materials (Au, Ag, Al, Au-Ag-Pd alloy, Ti, Co-Cr alloy) were embedded in a glass phantom.
  • Scans were performed using a 1.5-T MR scanner with T1-weighted spin echo (SE) and gradient echo (GRE) sequences, following ASTM F2119-07 standards.
  • Image uniformity was measured using the non-uniformity index (NUI).

Main Results:

  • Cobalt-chromium (Co-Cr) alloy and titanium (Ti) significantly reduced MR image uniformity, especially in T1-GRE sequences.
  • Co-Cr implants caused the most substantial decrease in uniformity, with effects extending up to 6.6 cm.
  • Other metallic materials tested (Au, Ag, Al, Au-Ag-Pd alloy) showed no significant impact on image uniformity.

Conclusions:

  • MR image uniformity is compromised by the presence of Co-Cr and Ti, influenced by the scanning sequence and coil type.
  • The observed image non-uniformity is likely due to the high magnetic susceptibility of Co-Cr and Ti.
  • Standardized assessment methods are essential for quantifying the impact of metallic materials on MR imaging.