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Passive catheter tracking using MRI: comparison of conventional and magnetization-prepared FLASH
Jordin D Green1, Reed A Omary, J Paul Finn
1Department of Radiology, Northwestern University, Chicago, Illinois, USA.
Purpose:
To compare a magnetization-prepared gradient-echo (GRE) sequence with a conventional GRE sequence for visualizing contrast agent-filled catheters.
Materials And Methods:
Passive visualization of endovascular catheters using MRI was compared between two imaging sequences: 1) inversion recovery (IR)-fast low angle shot (FLASH), and 2) conventional FLASH. Two-dimensional projection images of the catheters filled with 4% diluted contrast agent in a phantom and the aorta of swine were obtained with each sequence with a temporal resolution of two frames per second. We compared background suppression and catheter visibility using the catheter-to-background signal ratio and the ratings of two radiologists.
Results:
In the phantom, IR-FLASH allowed for a 200% increase in catheter-to-background ratio (p < 0.01) and improved depiction of catheters over conventional FLASH. In swine, the IR-FLASH images showed a statistically significant improvement of 80% (p < 0.001) over conventional FLASH in all comparisons of the catheter-to-background signal ratio, and an improvement of 160% (p < 0.05) in comparison with the radiologists' observations.
Conclusion:
This study shows that IR-FLASH is a better technique for passive tracking of contrast agent-filled catheters than conventional FLASH.