title: A study on a non-contacting respiration signal monitoring system using Doppler ultrasound.
abstract: We proposed non-contacting respiration signal monitoring system for sleep apnea syndrome. Experiments were conducted by emitting 40 kHz ultrasound beam, which is set tone burst mode by 1 ms period to a subject chest. Normal respiration condition and a simulated sleep apnea syndrome condition were measured while subjects were holding breath. To obtain the actual respiration signal from the raw signal, ultrasound attenuation characteristics were considered. The Doppler ultrasound signal was detectable once the received signal obtained by demodulation circuits passed through a low pass filter (LPF). The signal's ripples were eliminated by moving average method and the signal's peaks were detected by phase portrait reconstruction method to measure the respiration rate.
authors.affiliation: Department of Electrical and Electronic Engineering, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul, South Korea. medi1223@yonsei.ac.kr
authors.forename: Se Dong
authors.initials: SD
authors.lastname: Min
authors.forename: Dae Joong
authors.initials: DJ
authors.lastname: Yoon
authors.forename: Sung Won
authors.initials: SW
authors.lastname: Yoon
authors.forename: Yong Hyeon
authors.initials: YH
authors.lastname: Yun
authors.forename: Myoungho
authors.initials: M
authors.lastname: Lee
mesh_terms: D000465:Algorithms; D006801:Humans; D008991:Monitoring, Physiologic / Q000379:methods; D012119:Respiration; D012815:Signal Processing, Computer-Assisted; D012891:Sleep Apnea Syndromes / Q000000981:diagnostic imaging* / Q000503:physiopathology; D018608:Ultrasonography, Doppler / Q000379:methods