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MR parameters for imaging titanium spinal instrumentation

J C Wang1, H S Sandhu, W D Yu

  • 1UCLA Comprehensive Spine Center, UCLA Department of Orthopaedic Surgery, 90024-6970, USA.

Journal of Spinal Disorders
|February 1, 1997
PubMed
Summary
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Titanium alloy spinal implants allow for high-quality magnetic resonance (MR) imaging with minimal artifact. This study identified optimal MR imaging parameters for titanium constructs, improving visualization of the instrumented spine.

Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Biomedical Engineering

Background:

  • Stainless steel spinal implants cause significant magnetic resonance (MR) imaging artifact.
  • Titanium alloy spinal instrumentation offers a potential solution for improved MR imaging compatibility.

Purpose of the Study:

  • To evaluate the feasibility of MR imaging in spines with titanium alloy instrumentation.
  • To determine optimal MR imaging parameters for minimizing artifact with titanium implants.

Main Methods:

  • A titanium pedicle screw construct was implanted into human cadaveric lumbar spines.
  • Sequential spin echo MR scans were performed using varied echo time (TE) and repetition time (TR) settings.
  • Images were quantitatively graded for clarity of adjacent soft tissue and osseous structures.

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Main Results:

  • Excellent T1- and T2-weighted MR images were achieved with minimal artifact.
  • Optimal parameters for T1-weighted images: TE = 16, TR = 500-600.
  • Optimal parameters for T2-weighted images: TE = 60, TR = 1,300-1,600.

Conclusions:

  • High-quality MR imaging of the instrumented spine is feasible with titanium alloy.
  • Appropriate selection of MR imaging parameters (TE and TR) is crucial for artifact reduction.
  • Titanium implants significantly reduce MR imaging artifact compared to stainless steel.