Intracranial pressure measurement artifact reduction method

• US 20020183650A1
• Filed: 07/17/2002
• Published: 12/05/2002
• Est. Priority Date: 02/11/2000
• Status: Active Grant

• Current Assignee: Huntleigh Technology, Inc.
• Original Assignee: Morgan Stanley & Co Incorporated (Morgan Stanley)
• Inventors: Johnson, Royce
• Granted Patent: US 6,878,119 B2
• Time in Patent Office: Days
• US Class Current: 600/561
• CPC Class Codes: A61B 5/031 Intracranial pressure
• CPC Class Codes: A61B 5/7264 Classification of physiological signals or data, e.g. using neural networks, statistical classifiers, expert systems or fuzzy systems neural networks per se G06N3/00; expert systems per se G06N5/00
• CPC Class Codes: Y10S 128/925 Neural network

Abstract

A method for artifact reduction in sonomicrometer obtained intracranial pressure measurements generally comprises isolating a component of a sonomicrometer waveform attributable solely to changes in intracranial volume by using a neural network or other nonlinear engine to extract a heartbeat component from the sonomicrometer output. Because the heartbeat is so characteristic, no actual measurement of the heartbeat as the forcing function is required to isolate the resulting changes in distance from the artifact induced changes in distance. The neural network then be utilized to directly map measured changes in skull distance over time to changes in intracranial pressure over a volume change, the inverse of compliance. The method is generally extendable to use with other volumetric based measurement techniques.

Claims

1. A method of artifact reduction in sonomicrometer-obtained intracranial pressure measurements comprising isolating the change in distance attributable to changes in intracranial volume by extracting a heartbeat component from the sonomicrometer output.

2. A method according to claim 1 utilizing a neural network.

3. A method according to claim 2 wherein said neural network is utilized to map measured changes in skull distance over time.

4. A method according to claim 3 wherein changes in intracranial pressure over time are compared to changes in skull distance.

5. A method of artifact reduction in a volumetric measurement wherein a first component of the volumetric measurement is isolated from a second, artifact-induced component of the volumetric measurement by extracting a distinctive wave form from said volumetric measurement.