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[An algorithm for passive marker localization in interventional MRI].

Jaane Rauschenberg1, André de Oliveira, Sven Müller

  • 1Deutsches Krebsforschungszentrum (dkfz), Abt. Medizinische Physik in der Radiologie, Heidelberg, Deutschland.

Zeitschrift Fur Medizinische Physik
|September 21, 2007
PubMed
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This study presents an algorithm for precise localization of passive markers in MRI, crucial for guiding medical instruments. The method achieves sub-pixel accuracy, enhancing safety in interventional procedures.

Area of Science:

  • Medical Imaging
  • Image Processing
  • Interventional Radiology

Context:

  • Accurate localization of passive markers in interventional Magnetic Resonance Imaging (MRI) is essential for monitoring medical instruments lacking MR signal emission.
  • Current methods may lack the precision required for complex interventions.

Purpose:

  • To develop and validate an automated algorithm for precise localization of passive marker systems in MR images.
  • To assess the algorithm's performance regarding precision, noise sensitivity, and signal interference.

Summary:

  • A novel algorithm combining phase-only cross-correlation and center-of-mass analysis automatically detects passive markers in MR images.
  • The algorithm achieves sub-pixel localization precision, outperforming standard pixel-level accuracy.

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  • Performance was validated through simulations and phantom experiments, demonstrating robustness against noise and signal variations.

    • Impact:

    • Achieves localization precision better than one pixel, with significant accuracy above a signal-to-noise ratio (SNR) of 4.5.
    • Demonstrates minimal influence from unwanted signals at SNR values of 6 and above.
    • In phantom studies, the algorithm realized a maximal deviation of 0.6 mm for needle tips in MR-guided injections, improving procedural accuracy.