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Automatic slice positioning (ASP) for passive real-time tracking of interventional devices using
1Division of Radiological Physics, Department of Radiology, University of Basel Hospital, Basel, Switzerland. sunil.patil@unibas.ch
Magnetic Resonance in Medicine
|July 9, 2009
Summary
A new method called projection-reconstruction imaging with echo-dephasing (PRIDE) enables fast, real-time tracking of medical devices using paramagnetic markers. This technique successfully localized markers in vitro and in vivo, showing potential for interventional procedures.
Area of Science:
- Medical Imaging
- Interventional Radiology
- Biomedical Engineering
Background:
- Real-time tracking of interventional devices is crucial for minimally invasive procedures.
- Existing tracking methods face challenges with speed, accuracy, and integration with imaging sequences.
- Paramagnetic markers offer potential for device localization but require effective imaging strategies.
Purpose of the Study:
- To present a novel and fast approach for passive real-time tracking of interventional devices.
- To demonstrate the efficacy of projection-reconstruction imaging with echo-dephasing (PRIDE) for marker localization.
- To evaluate the integration of PRIDE with balanced steady-state free precession (bSSFP) for active slice positioning (ASP).
Main Methods:
- Developed and implemented projection-reconstruction imaging with echo-dephasing (PRIDE) using echo-dephased projections along three axes.
- Optimized dephasing to suppress background tissue signals while enabling echo formation near paramagnetic markers.
- Interleaved PRIDE with bSSFP for real-time positional updates and demonstrated active slice positioning (ASP) in vitro.
Main Results:
- Successfully demonstrated in vitro and in vivo localization of paramagnetic markers using PRIDE.
- PRIDE effectively suppressed background signals and compensated for various off-resonance conditions.
- Active slice positioning (ASP) with PRIDE achieved positional updates in approximately 20 ms, comparable to existing methods.
Conclusions:
- PRIDE is a novel, fast, and effective method for passive real-time tracking of interventional devices using paramagnetic markers.
- The technique shows robustness in the presence of common off-resonance artifacts.
- Integration with bSSFP enables rapid active slice positioning, advancing real-time image-guided interventions.
