Millimeter wave radar-based motion monitoring method in magnetic resonance imaging system

Jiale Min; Yiran Li; Xinyuan Xia; Han Wang; Peng Liu; Tuoyu Cao; Hao Ren

doi:10.1117/12.2653549

7 April 2023 Millimeter wave radar-based motion monitoring method in magnetic resonance imaging system

Jiale Min, Yiran Li, Xinyuan Xia, Han Wang, Peng Liu, Tuoyu Cao, Hao Ren

Proceedings Volume 12463, Medical Imaging 2023: Physics of Medical Imaging; 124632F (2023) https://doi.org/10.1117/12.2653549
Event: SPIE Medical Imaging, 2023, San Diego, California, United States

Conference Poster

Abstract

Head magnetic resonance imaging (MRI) is susceptible to motion artifacts. Images with gross motion artifacts cannot be easily corrected, which makes the monitoring of patient movement is essential to improve the acquired image quality. Several methods have been proposed to detect patient movement during MRI scanning, such as navigator, optical tracking system and the image quality assessment. However, they have some disadvantages such as insufficient real-time performance and requiring additional MR data acquisition. Herein, we propose an MR-compatible millimeter wave (mmWave) radar system to monitor some typical types of movements during head MRI scanning. The radar sensor is installed in a 3T MR system. When MRI system scanning, the radar installed will vibrate. A novel algorithm is proposed to generate the spectrogram without vibration interference. Due to limited movement, we explore how the range information rather than micro-Doppler information can assist the activity classification. After data processing, convolutional neural network (CNN) is applied to extract the features in multiple range bins. The extracted features will be inputted to a shallow neural network for recognizing the moving parts. The result shows four different activities are classified with an overall accuracy of (96.81±0.69)%. Finally, experimental results with acquired head MR images prove our system’s sufficient capability of recognizing nodding head yet inadequate capability of detecting head shaking movement.

Citation Download Citation

Jiale Min, Yiran Li, Xinyuan Xia, Han Wang, Peng Liu, Tuoyu Cao, and Hao Ren "Millimeter wave radar-based motion monitoring method in magnetic resonance imaging system", Proc. SPIE 12463, Medical Imaging 2023: Physics of Medical Imaging, 124632F (7 April 2023); https://doi.org/10.1117/12.2653549

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