Patent ID: 6544170
Filing Date: 2003-04-08
Classification: A61B

Abstract:
A biosignal measuring method for measuring, with a plurality of sensors, minute biosignals generated from bioelectric current sources in a region of a patient to be diagnosed, said method comprising:a signal decomposing step for decomposing detection signals provided by said plurality of sensors into a plurality of independent components, said signal decomposing step being executed to determine and average said independent components for a predetermined number of times; a noise component-removing step for determining noise components among said independent components based only on states of said independent components, and removing said noise components; a signal restoring step for deriving restored detection signals from respective non-noise independent components; and a signal-analyzing step for determining an intracerebral activity (location, direction and strength) corresponding to each independent component of each of said restored detection signals, wherein said noise component removing step is executed, with reference to a ratio Ma/Mb between a standard deviation Ma of each independent component for a non-examination period within an entire detection signal measuring time, which non-examination period runs from a start of measurement to a point of time when a stimulus is applied to the patient, and a standard deviation Mb for an examination period following said point of time when said stimulus is applied, to determine an independent component with said ratio Ma/Mb equal to or greater than a fixed value to be a noise component, and an independent component with said ratio Ma/Mb less than said fixed value to be a non-noise component.