Patent ID: 8512253
Filing Date: 2013-08-20
Classification: A61B

Abstract:
1. An apparatus for estimating time-varying cerebral blood flow, the apparatus comprising: a controller configured to: obtain a time-varying impedance plethysmography signal from a head of a subject; use the impedance plethysmography signal to calculate a time-varying cerebral blood flow indicator; and perform data processing on the impedance plethysmography signal and the cerebral blood flow indicator to reduce at least one of noise and artifacts, wherein performing data processing comprises discarding cardiac cycle data of the impedance plethysmography signal for a cardiac cycle which meets one or more criteria for discarding, and wherein the criteria comprise the impedance plethysmography signal having a cross-correlation below a threshold, between the cardiac cycle and at least one of a following cardiac cycle and a preceding cardiac cycle.