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Noninvasive In Vivo Small Animal MRI and MRS: Basic Experimental Procedures
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Nitinol in magnetic resonance imaging.

Melzer1, Michitsch, Konak

  • 1Dept of Physical Engineering & Institute for Innovative Technologies and Management in Medicine INSITE Med University of Applied Sciences Gelsenkirchen Germany.

Minimally Invasive Therapy & Allied Technologies : MITAT : Official Journal of the Society for Minimally Invasive Therapy
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Summary

Nitinol devices like stents and filters create magnetic resonance image (MRI) artifacts, which can compromise diagnostic imaging. Understanding these artifacts is crucial for safe and effective MRI procedures involving such implants.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging Physics
  • Materials Science

Background:

  • Surgical instruments and implants often cause significant artifacts in magnetic resonance imaging (MRI).
  • These artifacts can obscure diagnostic information near implants, with signal loss occurring in close proximity or within the device.
  • Nitinol (nickel-titanium alloy) devices are increasingly used in interventional procedures, necessitating an understanding of their MRI behavior.

Purpose of the Study:

  • To fundamentally evaluate the magnetic resonance image (MRI) artifacts generated by various Nitinol devices.
  • To assess the utility of these artifacts for visualizing interventional tools during MRI-guided procedures.
  • To provide a basis for understanding the interaction between Nitinol implants and MRI.

Main Methods:

  • Evaluation of MRI artifacts from Nitinol devices including stents, vena cava filters, and heart defect closure devices.
  • Testing was conducted in a 1.0 Tesla magnetic field.
  • Adherence to American Society for Testing Materials (ASTM) recommendations for MRI sequence selection and test setup.

Main Results:

  • Nitinol devices produce significant MRI artifacts, impacting diagnostic image quality.
  • The study provides a fundamental evaluation of artifact characteristics for common Nitinol interventional devices.
  • Results are not sufficient for regulatory approval (e.g., FDA).

Conclusions:

  • Nitinol devices generate predictable MRI artifacts that can affect diagnostic imaging.
  • Understanding these artifacts is essential for optimizing MRI procedures involving Nitinol implants.
  • Further research may be needed for comprehensive device characterization and regulatory submission.