Optical measurement apparatus for living body
First Claim
1. An optical measurement apparatus for living body comprising a means for irradiating visible to infrared light onto an object to be examined, a means for detecting light transmitted inside said object and generates signals corresponding to the detected amount of light, a signal processing means for processing the signals and generating biological signals of the object to be examined and a display means for displaying the biological signals generated by said signal processing means;
- wherein said signal processing means comprises at least one signal separating means for separating the biological signals into multiple component signals, a signal selecting means for selecting specified component signals based on correlation values between component signals and a pre-determined reference waveform signal that represents a characteristic of living-body reaction of the examined object, and a signal reconstruction means for reconstructing the biological signals by using the selected specified component signals, excluding those containing noise, of said multiple component signals.
5 Assignments
0 Petitions
Accused Products
Abstract
A principal component analysis or an independent component analysis is conducted on the living body signals, e.g., local cerebral blood amount change signals obtained by the living body optical measurement to extract and display multiple component signals thereof. Signals other than the component signals containing noise are selected from these component signals automatically or manually, and the local cerebral blood amount change signals are reconstructed by using selected signals. The reconstructed signals is displayed and further subjected to the component analysis or the reconstruction as appropriate, and used for the profiling of information necessary for the diagnosis. Consequently, high-precision target signals can be obtained by completely removing external noise included in the living body signals, particularly the noise which cannot be adequately removed by the moving average and the filtering processings.
-
Citations
16 Claims
-
1. An optical measurement apparatus for living body comprising a means for irradiating visible to infrared light onto an object to be examined, a means for detecting light transmitted inside said object and generates signals corresponding to the detected amount of light, a signal processing means for processing the signals and generating biological signals of the object to be examined and a display means for displaying the biological signals generated by said signal processing means;
wherein said signal processing means comprises at least one signal separating means for separating the biological signals into multiple component signals, a signal selecting means for selecting specified component signals based on correlation values between component signals and a pre-determined reference waveform signal that represents a characteristic of living-body reaction of the examined object, and a signal reconstruction means for reconstructing the biological signals by using the selected specified component signals, excluding those containing noise, of said multiple component signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
10. An optical measurement apparatus for living body comprising a means for irradiating visible to infrared light onto multiple positions of an object to be examined, a means for detecting a light irradiated from said multiple positions and transmitted inside the object and generating measurement signals at multiple measurement points which are defined by the irradiating and detecting positions, a signal processing means for processing measurement signals detected by said detection means and generating waveforms indicating changes of substance inside the object at the multiple measurement points and a display means for displaying the results of processing by said signal processing means;
wherein said signal processing means comprises a signal separating means for separating the waveforms into multiple component waveforms, a signal selecting means for selecting specified component signals based on correlation values between component signals and a pre-determined reference waveform signal that represents a characteristic of living-body reaction of the examined object, and a signal reconstruction means for reconstructing waveforms representing changes in substance inside said object to be examined by using the selected specified component waveform among the multiple component waveforms.
-
11. A method of removing noise from the optical measurement signals of living body obtained by irradiating a light onto the examination site of an object to be examined and detecting a light transmitted through said examination site, comprises
a step of analyzing components of the optical measurement signals and separating them into multiple component signals, a step of selecting specified component signals based on correlation values between component signals and a predetermined reference waveform signal, wherein the predetermined reference waveform signal represents a characteristic of living-body reaction of the examined object, and a step of reconstructing optical measurement signals by using specified component signals among the separated multiple component signals.
Specification