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Shelley Zhang et al. (SCMR poster)

MRI-compatible Voltage-based Electro-anatomic Mapping System for 3T MR-guided Cardiac Electrophysiology. Shelley Zhang et al. (SCMR poster). Developing MRI-Compatible voltage device tracking (SJM NavX, BSW Carto3) Tested on GE & Siemens, 1.5T* and 3T Simultaneous Tracking & Imaging.

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Shelley Zhang et al. (SCMR poster)

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  1. MRI-compatible Voltage-based Electro-anatomic Mapping System for 3T MR-guided Cardiac Electrophysiology Shelley Zhanget al. (SCMR poster) • Developing MRI-Compatible voltage device tracking (SJM NavX, BSW Carto3) Tested on GE & Siemens, 1.5T* and 3T • Simultaneous Tracking & Imaging. • Track inside & outside MRI • No heating, lower accuracy than MR-Tracking • Also supporting (Mylar) Invasive Blood Pressure • Defibrillation detected and resolved inside MRI • Working on dual MR-tracking and NavX catheters • Working on intracardiac MRI imaging& tracking catheters * Schmidt et. al. , MRM 2013

  2. Computation of the Gradient-Induced Electric Field Noise in 12-lead ECG Traces During Rapid MRI Sequences Shelley Zhanget al. (SCMR poster) • Developing MRI-Compatible 12-lead ECG. Tested on GE & Siemens, 1.5 and 3T • Resolving residual issues with SSFP and FSE (short TR, high Duty Cycle scans)* • Gradient-noise (<80mV) depends on spatial magnetic-field gradients. Varies with gradient pulses and electrodes. • Perform short (3s) scan and read data. • Fit to theoretical equation • Clean ECGs at all 12 electrodes • Integrating with hardware switching system for largest noise (limb leads) • Real-Time software processing for precordial leads. V(t)i = αi•dGx/dt+βi•dGy/dt+γi•dGz/dt+δiGx+εiGy+ζiGz+Ci * Tse et. al. , MRM 2013 V1 V2 V3 V4 V5 V6

  3. Real-time Active-tracking of Metallic Needles during MR-guided Radiation Therapy: from concept to human trials Wei Wang et al. (ISMRM 2014) • Developing MR-Tracking for metallic devices. Integrated with Siemens 3T.* • Resolved issues with metal effects on B0 and B1 • Built 1.6mm (5 Fr) metal needles by adding printed-circuit coils into groves in tungsten needles. • Requires phase dithering MR-Tracking • Heating <0.170C • Using for guidance of brachytherapy needle insertion in cervical cancer patients • Building metallic braided deflectable catheters and sheathes for EP use Simulation of RF (B1) Field Metal needle 2 mm * Wang et. al. , AAPM 2013, RSNA 2013

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