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In situ guidance for MRI interventions using projected feedback.

Pezhman Foroughi1, Alican Demir2, Martin Hossbach2

  • 1Clear Guide Medical Inc., Baltimore, MD, 21211, USA. foroughi@clearguidemedical.com.

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Summary

This study presents an augmented reality (AR) system for MRI-guided needle placement, enhancing accuracy in procedures like biopsies. The AR system projects guidance directly onto the insertion site, improving physician focus and reducing targeting errors.

Keywords:
Augmented realityGuidanceMRI interventionNavigationProjectorTracking

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Area of Science:

  • Medical Imaging and Interventional Radiology
  • Augmented Reality in Medicine
  • Surgical Navigation Systems

Background:

  • MRI-guided procedures require precise instrument placement.
  • Current navigation methods can divert physician focus from the intervention site.
  • Need for improved real-time guidance systems in interventional radiology.

Purpose of the Study:

  • To develop and assess an augmented reality (AR) instrument guidance system for MRI-guided needle placement.
  • To enable physicians to target insertions accurately while maintaining direct visualization of the anatomy.
  • To evaluate the system's feasibility and accuracy in musculoskeletal biopsy and arthrography procedures.

Main Methods:

  • The system integrates stereo cameras, a projector, and a computational unit within the MRI suite.
  • VisiMARKERs, multi-modality fiducial markers, ensure automatic registration between MRI and camera views.
  • Direct projection of navigation feedback onto the intervention site eliminates the need for secondary monitors.

Main Results:

  • Feasibility and accuracy were validated using custom shoulder phantoms.
  • Two radiologists performed 80 needle insertions with projected guidance.
  • The system achieved a mean targeting error of 1.09 mm and an overall error of 2.29 mm.

Conclusions:

  • The developed AR system is feasible and accurate for MRI-guided needle placement.
  • The system operated reliably within the MRI suite environment.
  • Physicians could effectively use the projected guidance for accurate needle placement without intermediate imaging.