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Abstract #3296

Cardiac MR Gating Using a Non-contact MR-compatible Doppler Radar System at 3T: Initial Results on Healthy Subjects

Tong Wu1, Haotian Hong1, Mingjuan Qin2, Zhengyu Cai1, Shunli Han2, Yiran Li3, Xinyuan Xia2, Lingzhi Hu3, Peng Hu1,4, and Zhihua Ren1,4
1School of Biomedical Engineering & State Key Laboratory of Advanced Medical Materials and Devices, ShanghaiTech University, Shanghai, China, 2United Imaging Research, Shanghai, China, 3United Imaging Healthcare North America, Houston, TX, United States, 4Shanghai Clinical Research and Trial Center, Shanghai, China

Synopsis

Keywords: Hybrid & Novel Systems Technology, Hybrid & Novel Systems Technology, Cardiac MR, MR-compatible, Cardiac Gating, Cardiac Radar, Non-contact Sensing

Motivation: Conventional electrocardiography (ECG) multi-electrode setups are essential for cardiac MR (CMR) gating, but they are cumbersome and pose electrical safety risks to patients.

Goal(s): This study aims to investigate a feasible non-contact CMR gating approach using a MR-compatible doppler cardiac radar, and it can possibly offer improved patient comfort and flexibility.

Approach: An 886 MHz microstrip-patch-based MR-compatible cardiac radar was proposed, optimized, and fabricated, and it worked with a home-made FPGA module to communicate with the scanner to achieve real-time cardiac triggering.

Results: In-vivo scans validated the feasibility of the proposed approach, which was rigorously compared with CMR images via traditional ECG methods.

Impact: The proposed cardiac radar provides a non-contact alternative for cardiac gating in MRI. Future research may explore signal biological mechanisms and its additional applications in respiratory gating.

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