Title:
A cerebral function activity degree evaluation system and an assessment system using it
Document Type and Number:
Japanese Patent JP6017015
Kind Code:
B2
Abstract:
Discrete Fourier transform is performed on an output of each of brain potential sensors, which measure a brain potential of a subject, for each of segments in order to obtain a discrete Fourier coefficient that has a frequency component, which is an integral multiple of a fundamental frequency that is an inverse number of a predetermined time width, within a predetermined frequency band. A mean value of squares of absolute values of Fourier coefficients is obtained. The Fourier coefficients are normalized using the mean value of the squares of the absolute values thereof in order to obtain a normalized power spectrum (NPS;j,m) that is a first parameter. A product of mean values of squares of absolute values of Fourier coefficients of adjoining frequency components in all the segments is normalized using a square value of the sum of the mean values of the adjoining frequency components in order to obtain a normalized power ratio (NPV;j,m) that is a second parameter. Two markers sNAT;j,m and vNAT;j,m are derived from the first and second parameters respectively in order to evaluate a brain function activity level.
Inventors:
Toshimitsu Musha
Application Number:
JP2015504288A
Publication Date:
October 26, 2016
Filing Date:
March 03, 2014
Export Citation:
Assignee:
Brain Function Institute Co., Ltd.
International Classes:
A61B5/0476; A61B5/05
Domestic Patent References:
| JP5118230B2 | 2013-01-16 | |||
| JP4145344B1 | 2008-09-03 |
Other References:
JPN6014015168; 上田泰士、武者利光、八木透: '脳波解析によるアルツハイマー病の特性に関する研究' 電気学会論文誌 電子・情報・システム部門誌（ＩＥＥＪ Ｔｒａｎｓａｃｔｉｏｎｓ ｏｎ Ｅｌｅｃｔｒｏｎｉｃｓ， Ｉｎｆｏｒｍａｔｉｏｎ ａｎｄ Ｓｙｓｔｅｍ Ｖｏｌ． １３０， Ｎｏ． １０, 20101001, 第１８２７-１８３２頁
Attorney, Agent or Firm:
Mamoru Nakamura
Previous Patent: A counterbalance lift mechanism and a method
Next Patent: HEAT TREATMENT OF TURBINE ROTOR
Next Patent: HEAT TREATMENT OF TURBINE ROTOR