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Related Concept Videos

Magnetic Resonance Imaging01:24

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking
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Measurement accuracy of different active tracking sequences for interventional MRI.

Tobias Wech1, Steven M Shea, Julien Barbot

  • 1Center for Applied Medical Imaging and Computer Vision, Siemens Corporation, Corporate Technology, Baltimore, Maryland, USA; Institute of Radiology, University of Würzburg, Würzburg, Germany; Comprehensive Heart Failure Center, University of Würzburg, Würzburg, Germany.

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Summary

This study evaluated three active tracking sequences for spatial accuracy. Hadamard Encoding demonstrated superior immunity to off-resonances compared to Single and Dual Echo sequences, showing less than 1.5 mm positional error.

Keywords:
active trackingelectrophysiological proceduresinterventional MRI

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Area of Science:

  • Medical Imaging
  • Electrophysiology
  • Surgical Navigation

Background:

  • Accurate catheter tracking is crucial for interventional procedures.
  • Existing active tracking sequences have varying sensitivities to magnetic field distortions.

Purpose of the Study:

  • To compare the spatial accuracy of three active tracking sequences: Single Echo, Dual Echo, and Hadamard Multiplexed.
  • To introduce a novel phantom design for objective evaluation of tracking accuracy.

Main Methods:

  • A custom-built phantom and an electrophysiology catheter with micro-coils were used.
  • Tracking profiles were acquired in 3D and validated against Vernier caliper measurements and 3D reference scans.
  • Positional accuracy was assessed using Bland-Altman analysis.

Main Results:

  • All three sequences exhibited positional errors of less than 1.5 mm.
  • Single Echo and Dual Echo sequences were susceptible to off-resonance artifacts.
  • Hadamard Encoding proved immune to off-resonance effects, indicating higher robustness.

Conclusions:

  • The developed phantom facilitates objective measurement of active tracking sequence accuracy.
  • The study provides a method for objectively contrasting different tracking techniques for interventional use.
  • Hadamard Encoding offers enhanced reliability in environments prone to magnetic field variations.