SYSTEM AND METHOD FOR DETERMINING VIDEO-BASED PULSE TRANSIT TIME WITH TIME-SERIES SIGNALS

摘要

PROBLEM TO BE SOLVED: To provide a system and method for determining arterial pulse transit time of a subject of interest from time-varying source signals generated from video images.SOLUTION: A video imaging system is used to capture a time-varying source signal of a proximal region and a distal region of a subject of interest. Image frames are processed to isolate localized areas of the proximal and distal regions of exposed skin of the subject. A time-series signal for each of the proximal and distal regions is extracted from source video images. A phase angle is computed with respect to a frequency for each of the time-series signals to produce respective phase with respect to frequency curves for each region. Slopes within a selected cardiac frequency range are extracted from each of the phase curves and a difference is computed between the two slopes to obtain an arterial pulse transit time for the subject.