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Updated: Mar 31, 2026
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Noninvasive In Vivo Small Animal MRI and MRS: Basic Experimental Procedures
Published on: October 20, 2009
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Technical Note: MR-visualization of interventional devices using transient field alterations and balanced
Frank Eibofner1, Petros Martirosian1, Christian Würslin1
1Section on Experimental Radiology, University Hospital Tübingen, Tübingen D-72076, Germany.
Medical Physics
|November 2, 2015
Summary
Sequence-triggered direct currents in balanced steady-state free precession (bSSFP) imaging enable clear visualization of interventional devices. This method allows for conspicuous localization of instruments during magnetic resonance imaging procedures.
Area of Science:
- Medical Imaging
- Interventional Radiology
Background:
- Interventional magnetic resonance imaging (iMRI) utilizes conducting wires for instrument visualization.
- Current application is a known method for enhancing visualization of instruments.
Purpose of the Study:
- To demonstrate the potential of sequence-triggered transient direct currents in balanced steady-state free precession (bSSFP) imaging.
- To evaluate a novel method for visualizing interventional devices during MRI.
Main Methods:
- A conductor and modified catheter were tested in phantoms and ex vivo.
- Current was triggered within the bSSFP sequence between RF pulse and signal acquisition.
- Magnitude and phase images were analyzed using a postprocessing algorithm.
Main Results:
- Transient field alterations produced continuous phase shifts, distinguishable from persistent field alterations.
- The postprocessing algorithm successfully separated these phase shifts.
- The modified catheter was unambiguously localized in ex vivo liver tissue.
Conclusions:
- Sequence-triggered direct current application with phase imaging enables conspicuous localization of interventional devices.
- bSSFP sequences are suitable for visualizing instruments using this technique.
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