Patent ID: 7998075

Claim:
A method for non-invasively monitoring cerebrovascular autoregulation state comprising the steps of: obtaining intracranial blood volume waves; filtering a first informative wave from the intracranial blood volume Waves, said first informative wave comprising an intracranial blood volume slow wave; filtering a second informative wave from the intracranial blood volume waves, said second informative wave comprising an intracranial blood volume respiratory wave; filtering a primary reference wave from the intracranial blood volume waves; demodulating the primary reference wave into a reference wave envelope; filtering a first reference wave from the reference wave envelope; filtering a second reference wave from the reference wave envelope; calculating a first phase shift between said first informative wave and said first reference wave; calculating a second phase shift between said second informative wave and said second reference wave; calculating in a processor an index of evaluation of the status of cerebral autoregulation state from said first phase shift and said second phase shift; and comparing in a processor said index of evaluation of the status of cerebral autoregulation state to a predetermined index threshold value to determine cerebrovascular autoregulation state.