in Biosignal Processing Module Centre for Doctoral Training in Healthcare Innovation 1118 May 2012 Institute of Biomedical Engineering Department of Engineering Science University of Oxford ID: 411902
Download Presentation The PPT/PDF document "Heart Sounds" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Heart Soundsin Biosignal Processing ModuleCentre for Doctoral Training in Healthcare Innovation 11/18 May 2012
Institute of Biomedical EngineeringDepartment of Engineering ScienceUniversity of OxfordSlide2
How a heart soundsS1 – Atrial contractionS2 – Ventricular contraction S3 – Blood returning to the ventricleS4 – Ventricle is too full to contain the blood
Normal
Abnormal
S1 + S2
Lub
- Dub
S1 + S2 + S3 Ken – Tuck – Y
S4 + S1 + S2 Ten –
Nes
- See
Animation of heart valves opening and closing with sound
“
LUB
”
“
DUB
”Slide3
Heart soundsHow heart sounds change during illnesshttp://commons.wikimedia.org/wiki/File:Phonocardiograms_from_normal_and_abnormal_heart_sounds_with_pressure_diagrams.pngSlide4
Heart soundsHow to record heart sounds?Acoustic Stethoscope Chest piece transmits sound to the listener via air-filled hollow tubesSlide5
Heart soundsHow to record heart sounds?Electronic Stethoscope - microphonePlace a microphone in the chestpieceMoving magnetic coil electrical signalSlide6
Heart soundsHow to record heart sounds?Electronic Stethoscope - piezoelectricConnect one end of the crystal with the diaphragmPlates squeezed electric signalSlide7
Heart soundsHow to record heart sounds?Electronic Stethoscope - capacitor
Body
Conductive plates
Distance between plates
Electromagnetic diaphragm with conductive inner surface
Vibrations
electric signalSlide8
Heart soundsPhone appsAscultation – library of heart soundsiStethoscope – turn your iPhone into a stethoscope
Plug-in stethoscopeSlide9
Heart soundsOther uses of stethoscopes:Slide10
Heart soundsAny Questions?