title: A system for seismocardiography-based identification of quiescent heart phases: implications for cardiac imaging.
abstract: Seismocardiography (SCG), a representation of mechanical heart motion, may more accurately determine periods of cardiac quiescence within a cardiac cycle than the electrically derived electrocardiogram (EKG) and, thus, may have implications for gating in cardiac computed tomography. We designed and implemented a system to synchronously acquire echocardiography, EKG, and SCG data. The device was used to study the variability between EKG and SCG and characterize the relationship between the mechanical and electrical activity of the heart. For each cardiac cycle, the feature of the SCG indicating Aortic Valve Closure was identified and its time position with respect to the EKG was observed. This position was found to vary for different heart rates and between two human subjects. A color map showing the magnitude of the SCG acceleration and computed velocity was derived, allowing for direct visualization of quiescent phases of the cardiac cycle with respect to heart rate.
authors.affiliation: School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA. carson@gatech.edu
authors.forename: Carson A
authors.initials: CA
authors.lastname: Wick
authors.forename: Jin-Jyh
authors.initials: JJ
authors.lastname: Su
authors.forename: James H
authors.initials: JH
authors.lastname: McClellan
authors.forename: Oliver
authors.initials: O
authors.lastname: Brand
authors.forename: Pamela T
authors.initials: PT
authors.lastname: Bhatti
authors.forename: Ashley L
authors.initials: AL
authors.lastname: Buice
authors.forename: Arthur E
authors.initials: AE
authors.lastname: Stillman
authors.forename: Xiangyang
authors.initials: X
authors.lastname: Tang
authors.forename: Srini
authors.initials: S
authors.lastname: Tridandapani
mesh_terms: D000328:Adult; D004562:Electrocardiography / Q000379:methods; D005260:Female; D006334:Heart Function Tests / Q000379:methods*; D006339:Heart Rate / Q000502:physiology*; D006351:Heart Valves / Q000502:physiology; D006801:Humans; D008297:Male; D012815:Signal Processing, Computer-Assisted; D014057:Tomography, X-Ray Computed