Intraoperative EEG monitoring: (II). Similarity analysis using density-modulated t array.
A method of showing the similarity, in other words, defining the difference between a pair of EEG patterns has been developed. By using the student t test on the power spectra at the appropriate frequency intervals, the t values obtained can be used as an indicator of the difference between the spectral patterns with respect to the frequency intervals. This so-called t-profile can be computed on real time basis and the result superimposed in different colors using the apparatus described previously to produce a 3-dimensional picture. We call this picture a density-modulated t array or DTA. Along with CSA and DSA (compressed/density-modulated spectral arrays), it proved to be a very powerful tool in intraoperative EEG monitoring.
Kinefuchi
Y
Y
Department of Anesthesiology, School of Medicine, Tokai University, Kanagawa, Japan.
Katoh
H
H
Ohtani
I
I
Iga
T
T
Shirakura
K
K
Yamasaki
Y
Y
D000328:Adult; D000758:Anesthesia; D004569:Electroencephalography / Q000295:instrumentation; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008433:Mathematics; D008875:Middle Aged; D013514:Surgical Procedures, Operative