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This is a Experimental Study study.

September 17, 2025

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

Key Points

The non-contact cardiac radar approach improves patient comfort during MRI scans, enabling easier access.
In-vivo scans confirmed that the Doppler radar method for cardiac gating effectively compares with traditional ECG methods.
An 886 MHz microstrip-patch-based radar was developed, working with an FPGA module for real-time cardiac triggering.
Future research may investigate the radar's applications in respiratory gating, offering further patient benefits.

Abstract

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

Key Points

Abstract

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