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An expandable intravenous RF coil for arterial wall imaging
A J Martin1, R F McLoughlin, K C Chu
1The John P. Robarts Research Institute, Department of Diagnostic Radiology, University of Western Ontario, London, Canada. martin@sparky.drad.umn.edu
Journal of Magnetic Resonance Imaging : JMRI
|March 21, 1998
Summary
High-resolution artery imaging is improved with novel intravenous radiofrequency (RF) coils. These internal coils offer a significant signal-to-noise ratio (SNR) boost compared to external coils, enhancing visualization of artery walls.
Area of Science:
- Biomedical Engineering
- Medical Imaging
- Radiology
Background:
- High-resolution imaging of artery walls is crucial for diagnosing vascular diseases.
- Current external radiofrequency (RF) coils have limitations in achieving optimal signal-to-noise ratio (SNR) for peripheral artery imaging.
Purpose of the Study:
- To propose and evaluate an intravenous (iv) RF coil for enhanced high-resolution artery wall imaging.
- To compare the performance of iv RF coils against conventional external coils.
Main Methods:
- Investigated anatomic positioning of peripheral artery/vein pairs.
- Constructed a phantom mimicking the iliac artery/vein pair.
- Developed and tested prototype expandable iv coils using Cu-Be loops introduced via an 8-Fr catheter.
- Evaluated local and remote iv coil tuning effects.
- Demonstrated in vivo performance in a porcine animal model.
Main Results:
- Achieved a 15- to 20-fold increase in signal-to-noise ratio (SNR) with iv coils compared to external coils.
- Identified local iv coil tuning as providing significant SNR benefits.
- Demonstrated successful in vivo imaging in a porcine model, showing iv coils as an excellent alternative.
Conclusions:
- Intravenous RF coils offer a substantial SNR improvement for high-resolution artery wall imaging.
- Local tuning of iv coils maximizes SNR benefits.
- IV RF coils represent a promising advancement for peripheral vascular imaging, outperforming intraarterial coils.