Transcript BE-2

EEET0470
Biomedical
Electronics
สุริยา วิทยา
ประดิษฐ์
[email protected]
วัตถุประสงค์
Copyright © S.Witthayapradit 2010
• รู้ จักชนิดของอิเล็กโทรดกับการใช้ งาน
• เข้ าใจรู ปแบบของการวัดสัญญาณไฟฟ้ า
• เรี ยนรู้ ลกั ษณะของสัญญาณไฟฟ้ าจากร่ างกาย
• การใช้ สัญญาณไฟฟ้ าจากร่ างกายในงานอิเล็กทรอนิกส
Bio-Potentials
Copyright © S.Witthayapradit 2010
• Introduction to Bio-potentials
• The Origins of Bio-potentials
• Electrodes for Bio-potential
recordings
• The principles of Bio-
Introduction to BioPotentials
Copyright © S.Witthayapradit 2010
•
Electrocardiogram(ECG)
•
Electroencephalogram(EE
G)
• Electromyogram(EMG)
Introduction to BioPotentials
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The Origins of BioPotentials
Copyright © S.Witthayapradit 2010
Electrocardiogram(E
CG)
Electroencephalogram(EEG)
Electromyogram(EMG)
Electrooculogram(EOG)
Schematics of BioPotentials
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Electrode
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Suction
Electrode
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Floating
Electrode
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Needle
Electrode
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Fetal ECG
Electrode
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Electrode
Arrays
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MEMs Electrode
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Electrocardiogram(E
CG)
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Electrocardiogram(E
CG)
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Heart
cell
Heart muscle
Chest
Electrocardiogram(E
CG)
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Augustus Desiré
Waller
• capillary
electrometer
• cardinal leads
Willem Einthoven
• string galvanometer
• Einthoven limb leads
(standard leads)
Electrocardiogram(E
CG)
Copyright © S.Witthayapradit 2010
Frank Norman Wilson (18901952)
• unipolar potentials
• central terminal
Electrocardiogram(E
CG)
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GOLDBERGER
AUGMENTED LEADS
Electrocardiogram(E
CG)
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PRECORDIAL LEADS (chest
leads)
Electrocardiogram(E
CG)
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Electrocardiogram(E
CG)
Copyright © S.Witthayapradit 2010
Electroencephalogram
(EEG)
Copyright © S.Witthayapradit 2010
Hans Berger
[1873-1941]
Electroencephalogram
(EEG)
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Electroencephalogram
(EEG)
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Electroencephalogram
(EEG)
Copyright © S.Witthayapradit 2010
Electromyogram(E
MG)
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Electromyogram(E
MG)
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Electromyogram(E
MG)
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(E
MG)
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(E
MG)
Electrodes
Copyright © S.Witthayapradit 2010
Amplifier
+
DC
Coupling
Rectifier
Low pass
Filter
Medical Instrumentation:
Application And Design
By John Webster
Analog
Output
Electrooculogram(E
OG)
Copyright © S.Witthayapradit 2010
Electrooculogram(E
OG) The Ocular-Movement-Controlled Mouse
Copyright © S.Witthayapradit 2010
is the invention of DeVry Institute of
Technology,
David Dorflinger and Scott McKee.
Bio-potentials
Specifications
Medical Instrumentation: Application And
Copyright © S.Witthayapradit 2010
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 ,”
EEET0470
Biomedical
Electronics
The End
Q & A
สุริยา วิทยา
ประดิษฐ์
[email protected]
Exercises
Copyright © S.Witthayapradit 2010
1. สัญญาณขั้วไฟฟ้ าของร่ างกายมีอะไรบ้ าง
2. การวัดสัญญาณคลื่นไฟฟ้ าหัวใจแบบขั้วเดีย่ ว
ประกอบด้ วยแรงดันอะไรบ้ าง
3. Central Terminal คืออะไร
4. Augmented leads คืออะไร