1. 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. 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 Zhang et 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 = α i dGx/dt+β i dGy/dt+γ i dGz/dt+ δ i Gx+ ε i Gy+ ζ i Gz +C i * 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 B 0 and B 1 Built 1.6mm (5 Fr) metal needles by adding printed- circuit coils into groves in tungsten needles. Requires phase dithering MR- Tracking Heating <0.17 0 C Using for guidance of brachytherapy needle insertion in cervical cancer patients Building metallic braided deflectable catheters and sheathes for EP use * Wang et. al., AAPM 2013, RSNA 2013 Simulation of RF (B 1 ) Field 2 mm Metal needle