Bio-potentials and Electrophysiology Measurement EEET0470 Biomedical Electronics Bio-potentials and Electrophysiology Measurement สุริยา วิทยาประดิษฐ์ suriya@mut.ac.th w.suriya@yahoo.co.th Mobile : 089-788-6242 082-707-3375

วัตถุประสงค์ รู้จักชนิดของอิเล็กโทรดกับการใช้งาน Copyright © S.Witthayapradit 2010 รู้จักชนิดของอิเล็กโทรดกับการใช้งาน เข้าใจรูปแบบของการวัดสัญญาณไฟฟ้า เรียนรู้ลักษณะของสัญญาณไฟฟ้าจากร่างกาย การใช้สัญญาณไฟฟ้าจากร่างกายในงานอิเล็กทรอนิกส์

Bio-Potentials Introduction to Bio-potentials Copyright © S.Witthayapradit 2010 Introduction to Bio-potentials The Origins of Bio-potentials Electrodes for Bio-potential recordings The principles of Bio-potential Measurements

Electrocardiogram(ECG) Electroencephalogram(EEG) Introduction to Bio-Potentials Copyright © S.Witthayapradit 2010 Electrocardiogram(ECG) Electroencephalogram(EEG) Electromyogram(EMG) Electrooculogram(EOG)

Introduction to Bio-Potentials Copyright © S.Witthayapradit 2010

The Origins of Bio-Potentials Copyright © S.Witthayapradit 2010 Electrocardiogram(ECG) Electroencephalogram(EEG) Electromyogram(EMG) Electrooculogram(EOG)

Schematics of Bio-Potentials Copyright © S.Witthayapradit 2010

Electrode Copyright © S.Witthayapradit 2010

Suction Electrode Copyright © S.Witthayapradit 2010

Floating Electrode Copyright © S.Witthayapradit 2010

Needle Electrode Copyright © S.Witthayapradit 2010

Fetal ECG Electrode Copyright © S.Witthayapradit 2010

Electrode Arrays Copyright © S.Witthayapradit 2010

MEMs Electrode Copyright © S.Witthayapradit 2010

Electrocardiogram(ECG) Copyright © S.Witthayapradit 2010

Electrocardiogram(ECG) Copyright © S.Witthayapradit 2010 Heart cell Heart muscle Chest

Electrocardiogram(ECG) Copyright © S.Witthayapradit 2010 Augustus Desiré Waller capillary electrometer cardinal leads Willem Einthoven string galvanometer Einthoven limb leads (standard leads)

Electrocardiogram(ECG) Copyright © S.Witthayapradit 2010 Frank Norman Wilson (1890-1952) unipolar potentials central terminal

Electrocardiogram(ECG) Copyright © S.Witthayapradit 2010 GOLDBERGER AUGMENTED LEADS

Electrocardiogram(ECG) Copyright © S.Witthayapradit 2010 PRECORDIAL LEADS (chest leads)

Electrocardiogram(ECG) Copyright © S.Witthayapradit 2010

Electrocardiogram(ECG) Copyright © S.Witthayapradit 2010

Electroencephalogram(EEG) Copyright © S.Witthayapradit 2010 Hans Berger [1873-1941]

Electroencephalogram(EEG) Copyright © S.Witthayapradit 2010

Electroencephalogram(EEG) Copyright © S.Witthayapradit 2010

Electroencephalogram(EEG) Copyright © S.Witthayapradit 2010

Electromyogram(EMG) Copyright © S.Witthayapradit 2010

Electromyogram(EMG) Copyright © S.Witthayapradit 2010

Electromyogram(EMG) Remove any DC offset of the signal y2=detrend(y); Copyright © S.Witthayapradit 2010 y=load('emg.txt'); plot(y) xlabel('Sample number') ylabel('EMG signal') Remove any DC offset of the signal y2=detrend(y); Rectification of the EMG signal rec_y=abs(y2); plot(rec_y) xlabel('Sample number') ylabel('Rectified EMG signal')

Electromyogram(EMG) [b,a]=butter(5,10/1000,'low'); Copyright © S.Witthayapradit 2010 [b,a]=butter(5,10/1000,'low'); filter_y=filtfilt(b,a,rec_y); plot(filter_y) xlabel('Sample number') ylabel('Low Pass Filtered EMG signal') Fourier Transform of the EMG signals mf=psanalyse(y2,1000)

Electromyogram(EMG) Medical Instrumentation: Application And Design Copyright © S.Witthayapradit 2010 Medical Instrumentation: Application And Design  By John Webster

Electrooculogram(EOG) Copyright © S.Witthayapradit 2010

Electrooculogram(EOG) Copyright © S.Witthayapradit 2010 The Ocular-Movement-Controlled Mouse is the invention of DeVry Institute of Technology, David Dorflinger and Scott McKee.

Bio-potentials Specifications Copyright © S.Witthayapradit 2010 Medical Instrumentation: Application And Design  By John Webster

Bio-potentials Specifications Copyright © S.Witthayapradit 2010 Measurement, Instrumentation, and Sensors Handbook By John Webster

Bio-potentials Specifications Copyright © S.Witthayapradit 2010

Reference Copyright © S.Witthayapradit 2010 [1] John G.Webster , “Medical Instrumentation Application and Design” , Third edition , JOHN WILET & SONS. ,1998. [2] John G.Webster , “Measurement, Instrumentation, and Sensors Handbook” , CRC Press Inc. , 1999. [3] Robert B.Northrop , “Analysis and Application of Analog Electronic Circuits to Biomedical Instrumentation” , CRC Press , 2003. [4] Jaakko Malmivuo , Robert Plonsey ,” Bioelectromagnetism “ , OXFORD UNIVERSITY PRESS , 1995.

Bio-potentials and Electrophysiology Measurement EEET0470 Biomedical Electronics Bio-potentials and Electrophysiology Measurement The End Q & A สุริยา วิทยาประดิษฐ์ suriya@mut.ac.th w.suriya@yahoo.co.th Mobile : 089-788-6242 082-707-3375

Exercises สัญญาณขั้วไฟฟ้าของร่างกายมีอะไรบ้าง Copyright © S.Witthayapradit 2010 สัญญาณขั้วไฟฟ้าของร่างกายมีอะไรบ้าง การวัดสัญญาณคลื่นไฟฟ้าหัวใจแบบขั้วเดี่ยว ประกอบด้วยแรงดันอะไรบ้าง Central Terminal คืออะไร Augmented leads คืออะไร