This work assesses heartbeat detection by continuous-wave (CW) Doppler radar using low and high carrier frequencies of 433MHz and 5GHz as options for non-contact vitals sensing in MRI. The experimental results show that using the amplitude of received complex signals in low frequency 433MHz-detection can perform as well as 5GHz-detection due to near field interactions within a 20cm range, with similar heartbeat detection efficacy.
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