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Voltage-based device tracking in a 1.5 Tesla MRI during imaging: initial validation in swine models.


ABSTRACT: Voltage-based device-tracking (VDT) systems are commonly used for tracking invasive devices in electrophysiological cardiac-arrhythmia therapy. During electrophysiological procedures, electro-anatomic mapping workstations provide guidance by integrating VDT location and intracardiac electrocardiogram information with X-ray, computerized tomography, ultrasound, and MR images. MR assists navigation, mapping, and radiofrequency ablation. Multimodality interventions require multiple patient transfers between an MRI and the X-ray/ultrasound electrophysiological suite, increasing the likelihood of patient-motion and image misregistration. An MRI-compatible VDT system may increase efficiency, as there is currently no single method to track devices both inside and outside the MRI scanner.An MRI-compatible VDT system was constructed by modifying a commercial system. Hardware was added to reduce MRI gradient-ramp and radiofrequency unblanking pulse interference. VDT patches and cables were modified to reduce heating. Five swine cardiac VDT electro-anatomic mapping interventions were performed, navigating inside and thereafter outside the MRI.Three-catheter VDT interventions were performed at >12 frames per second both inside and outside the MRI scanner with <3 mm error. Catheters were followed on VDT- and MRI-derived maps. Simultaneous VDT and imaging was possible in repetition time >32 ms sequences with <0.5 mm errors, and <5% MRI signal-to-noise ratio (SNR) loss. At shorter repetition times, only intracardiac electrocardiogram was reliable. Radiofrequency heating was <1.5°C.An MRI-compatible VDT system is feasible.

SUBMITTER: Schmidt EJ 

PROVIDER: S-EPMC3884036 | biostudies-literature | 2014 Mar

REPOSITORIES: biostudies-literature

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Voltage-based device tracking in a 1.5 Tesla MRI during imaging: initial validation in swine models.

Schmidt Ehud J EJ   Tse Zion T H ZT   Reichlin Tobias R TR   Michaud Gregory F GF   Watkins Ronald D RD   Butts-Pauly Kim K   Kwong Raymond Y RY   Stevenson William W   Schweitzer Jeffrey J   Byrd Israel I   Dumoulin Charles L CL  

Magnetic resonance in medicine 20140301 3


<h4>Purpose</h4>Voltage-based device-tracking (VDT) systems are commonly used for tracking invasive devices in electrophysiological cardiac-arrhythmia therapy. During electrophysiological procedures, electro-anatomic mapping workstations provide guidance by integrating VDT location and intracardiac electrocardiogram information with X-ray, computerized tomography, ultrasound, and MR images. MR assists navigation, mapping, and radiofrequency ablation. Multimodality interventions require multiple  ...[more]

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