Abstract: A non-invasive method for monitoring of cerebrovascular blood flow autoregulation state includes sensing intracranial blood volume waves, filtering a slow wave, respiratory wave, and pulse wave informative components from said intracranial blood volume waves, filtering slow wave and respiratory wave reference components from the pulse wave envelope, calculating a first phase shift between said slow wave informative component and said slow wave reference component, calculating a second phase shift between said respiratory wave informative component and said respiratory wave reference component, and calculating the index of evaluation of the status of cerebral autoregulation state (ICAS) from said first phase shift and said second phase shift.
Type:
Grant
Filed:
April 25, 2008
Date of Patent:
August 16, 2011
Assignee:
UAB Vittamed Technologijos
Inventors:
Arminas Ragauskas, Gediminas Daubaris, Vytautas Petkus, Renaidas Raisutis
Abstract: An ultrasonic method for indicating a characteristic of intracranial components' volume changes includes the transmission of broadband ultrasound from a transmitting transducer positioned on one side of a human head to a receiving transducer located on another side of the human head with decomposition of the received signal into narrowband components and determination therefrom of group delay, phase angle and attenuation as a basis for derivation of the characteristic of the intracranial media.
Type:
Grant
Filed:
January 31, 2008
Date of Patent:
May 10, 2011
Assignee:
UAB Vittamed Technologijos
Inventors:
Arminas Ragauskas, Gediminas Daubaris, Vytautas Petkus, Renaldas Raisutis