Analysis of Non-Contact Multichannel Recording of Cardiac Vibration: Visual Seismocardiogram

Seismocardiography (SCG) is the recent research focus for cardiac monitoring and diagnosis. Contact based single channel accelerometer recordings suffer from limitations due to sensor placements and propagation delay. This work uses the airborne ultrasound device named Surface Motion Camera (SMC) for non-contact multichannel recording of the chest surface vibrations and proposes visualization techniques (vSCG) to enable simultaneous evaluation of both time and spatial variations of the vibrations. Recordings are performed on 10 healthy volunteers. The time propagation of vertical scans and 2D vibration contour maps at specific cardiac events are shown. These allow for a reproducible way for in-depth analysis of cardio mechanical activities, as compared to single channel SCG.