8th Interventional MRI Symposium Book of Abstracts - Otto-von ...

ight ventricle to left ventricle (LV) is shown. Fig. 3 and Fig. 4 display tracking catheter tip
shown as a green ball on top of a two-plane rendering of a prior volume, acquired in the same
scan session. Vurtigo visualization software also displays LV chamber surface rendering (Fig.
3). Finally, Fig. 4 shows a different view of the prior volume visualization of the LV overlaid
onto 2-plane view.
Figure 1. Bipolar recordings are shown for
catheter #1 (pacing catheter), catheter #2 (sensing)
and stimulator (STIM). (A) Intracardiac signals are
shown while pacing with active catheter tracking
off and tracking on.
Figure 2. Myocardial action potential wave
conduction from catheter #1 in RV to catheter #2 in
LV.
Figure 3. – Catheter tracking in two-plane view of
anatomical MRI volume overlaid with a volume
rendered of LV using Vurtigo. (green dots
represent tracking coils at proximal and distal end)
Figure 4. – Alternative image of two-plane view of
anatomical volume. Multiple slices can be viewed.
Conclusion
In conclusion, we presented an MR-compatible EP system for real-time MR imaging
able to perform localized pacing and mapping to directly locate and characterize potential
arrhythmogenic regions in the left ventricle (LV). Our system showed the ability to track
multiple devices, which is extremely important for replicating the clinical EP procedure.
Additionally, pacing was followed by successful myocardium capturing and was easily
confirmed by the change of heart rate, which indicates sinus rhythm override. Ultimately, the
significant advantage of our system lies in the fact that it allows for multiple devices tracking,
and has the ability to pace and record signals in multiple locations simultaneously. The result
is a powerful and versatile system tool for further studies relating electrical properties to MRIbased
scar-region characterization.
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