Abstract #3662

A Multi-Channel Real-Time Power Monitoring System for SAR Estimation Using FPGA in High Field MRI

Xinqiang Yan^1,2, Lei Shi³, Baotong Feng², Zhe Wang¹, Shujun Wei², Chuangxi Ma², Long Wei², and Rong Xue¹

¹State Key Laboratory of Brain and Cognitive Science, Beijing MRI Center for Brain Research, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China, People's Republic of, ²Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China, People's Republic of, ³State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, China, People's Republic of

Specific absorption rate (SAR) is a limiting factor for high field MRI due to excess RF power deposition in human subjects. In this study, we developed a multi-channel real-time RF power monitoring system for global and local SAR estimation using FPGA to ensure patient safety. The major components of the monitoring system include multiple dual directional couplers, demodulating logarithmic power sensors, analog to digital converters and a FPGA fast signal processing unit, etc. The deviation of the power measurement was less than 0.5dB after calibration for system errors over a dynamic RF signal range of 100dB.

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