Patent ID: 8838209
Filing Date: 2014-09-16
Classification: A61B,G06T

Abstract:
1. A method for determining an arterial pulse transit time between a proximal and distal region of a subject of interest from source video images acquired using a video imaging system in a non-contact, remote sensing environment, the method comprising: receiving time varying source images acquired over at least one channel of a video imaging system, said source images comprising video images captured of a proximal and distal region of an area of exposed skin of a subject of interest wherein an arterial pulse transit time in that area is desired to be determined; extracting, from said source images, a time series signal for each of said proximal and distal regions; computing a phase angle with respect to frequency for each of said time series signals; determining, using a processor, a phase difference between said computed phases, said phase difference comprising a monotonic function of frequencies in said signals; extracting, from said monotonic function, an arterial pulse transit time of said subject; and storing said extracted arterial pulse transit time to a storage device.