Presents Sonomicrometry: basic principles - PowerPoint PPT Presentation

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Presents Sonomicrometry: basic principles

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  1. Presents Sonomicrometry: basic principles

  2. Basic Principles • Theory of Operation • Construction of a crystal • Types of crystals available • Signals: direction and function • Calculation of distance • Sample Application – Ventricular Volume • Crystal placement • Representative data

  3. Theory of Operation • Construction of a crystal Epoxy covers the head Head diameter: - 2mm - 1mm - 0.7 mm Wire : copper

  4. Theory of Operation • Construction of a crystal Epoxy covers the head Head diameter: - 2mm - 1mm - 0.7 mm Wire : Stainless steel

  5. Theory of Operation • Construction of a crystal Epoxy covers the head Epoxy covers the head Head diameter: - 2mm - 1mm - 0.7 mm Wire covered by Silastic tubing for chronic studies

  6. Theory of Operation • Piezo electric transducers: • Crystal #1 sends a sound wave …crystal #2 receives signal transmitter Receiver

  7. Theory of Operation • Piezo electric transducers: transceiver: • Crystal #1 sends a sound wave …crystal #2 receives signal Receiver Transmitter • Crystal #2 sends a sound wave …crystal #1 receives signal

  8. Theory of Operation • Piezo electric transducers: transceiver: • Time of flight  distance = v * T • v = 1540 m/sec Receiver transmitter Distance = 1.5 mm Time of flight 1 sec

  9. Theory of Operation • Piezo electric transducers: transceiver: • Time of flight  distance = v * T • v = 1540 m/sec Receiver transmitter Distance = 3 mm Time of flight 2 sec

  10. Theory of Operation • Piezo electric transducers: transceiver: • Time of flight  distance = v * T • v = 1540 m/sec Receiver transmitter Distance = 4.5 mm Time of flight 3 sec

  11. Theory of Operation • Piezo electric transducers: transceiver: • Time of flight  distance = v * T • v = 1540 m/sec Receiver transmitter Distance = 6 mm Time of flight 4 sec

  12. Theory of Operation • Piezo electric transducers: transceiver: • Time of flight  distance = v * T • v = 1540 m/sec Receiver transmitter Distance = 7.5 mm Time of flight 5 sec

  13. Theory of Operation • Piezo electric transducers: transceiver: • Time of flight  distance = v * T • v = 1540 m/sec Receiver transmitter Distance = 9 mm Time of flight 6 sec

  14. Theory of Operation • Piezo electric transducers: transceiver: • Time of flight  distance = v * T • v = 1540 m/sec Receiver transmitter Distance = 9.5 mm Time of flight 7 sec

  15. Theory of Operation • Piezo electric transducers: transceiver: • Time of flight  distance = v * T • v = 1540 m/sec Receiver transmitter Distance = 11 mm Time of flight 8 sec

  16. Theory of Operation • Piezo electric transducers: transceiver: • Time of flight  distance = v * T • v = 1540 m/sec Receiver transmitter Distance = 12.5 mm mm Time of flight 9 sec

  17. Theory of Operation • Piezo electric transducers: transceiver: • Time of flight  distance = v * T • v = 1540 m/sec Receiver transmitter Distance = 14 mm Time of flight 10 sec

  18. Theory of Operation • Piezo electric transducers: transceiver: • Time of flight  distance = v * T • v = 1540 m/sec Receiver transmitter Distance = 15.5 mm Time of flight 11 sec

  19. Theory of Operation • Piezo electric transducers: transceiver: • Time of flight  distance = v * T • v = 1540 m/sec Receiver transmitter Distance = 17.5 mm Time of flight 12 sec

  20. Theory of Operation • Piezo electric transducers: transceiver: • Time of flight  distance = v * T • v = 1540 m/sec Receiver transmitter Distance = 17.5 mm Time of flight 12 sec

  21. Theory of Operation • No crystal alignment required 1 • Ultrasonic pulses propagate in all directions • Ability to network with all others in array 2 6 5 3 4

  22. base posterior anterior wall thickness segment shortening apex Sample Application – Ventricular Volume • Left ventricle

  23. free wall septal posterior anterior free wall apex Sample Application – Ventricular Volume septum base anterior LV RV posterior

  24. base posterior anterior Wall thickness apex Sample Application – Ventricular Volume Volume • Left ventricle ED ES Wall thickness Distance (mm) Segment shortening 15 10 Time

  25. base Sample Application – Ventricular Volume t Volume • Left ventricle ED ES Wall thickness posterior anterior Distance (mm) wall thickness segment shortening 15 10 apex

  26. base Sample Application – Ventricular Volume Volume • Left ventricle ED ES Wall thickness posterior anterior Distance (mm) wall thickness segment shortening 15 10 apex Time

  27. base Sample Application – Ventricular Volume Volume • Left ventricle ED ES Wall thickness posterior anterior Distance (mm) wall thickness segment shortening 15 10 apex Time

  28. base Sample Application – Ventricular Volume Volume Volume • Left ventricle ED ES Wall thickness Wall thickness posterior anterior Distance (mm) Distance (mm) wall thickness segment shortening 15 15 10 10 apex Time Time

  29. base Sample Application – Ventricular Volume Volume Volume • Left ventricle ED ES Wall thickness Wall thickness posterior anterior Distance (mm) Distance (mm) wall thickness segment shortening 15 15 15 10 10 10 apex Time Time

  30. base posterior anterior Wall thickness apex Sample Application – Ventricular Volume Volume Volume • Left ventricle ED ES Wall thickness Wall thickness Distance (mm) Distance (mm) Segment shortening 15 10 Time Time

  31. base Sample Application – Ventricular Volume Volume Volume • Left ventricle ED ES Wall thickness Wall thickness posterior anterior Distance (mm) Distance (mm) wall thickness segment shortening 15 15 15 10 10 10 apex Time Time

  32. base Sample Application – Ventricular Volume Volume Volume • Left ventricle ED ES Wall thickness Wall thickness posterior anterior Distance (mm) Distance (mm) wall thickness segment shortening 15 15 10 10 apex Time Time

  33. base Sample Application – Ventricular Volume Volume Volume • Left ventricle ED ES Wall thickness Wall thickness posterior anterior Distance (mm) Distance (mm) wall thickness segment shortening 15 15 10 10 apex Time Time

  34. base Sample Application – Ventricular Volume Volume Volume • Left ventricle ED ES Wall thickness Wall thickness posterior anterior Distance (mm) Distance (mm) wall thickness segment shortening 15 15 10 10 apex Time Time

  35. base Sample Application – Ventricular Volume Volume Volume • Left ventricle ED ES Wall thickness Wall thickness posterior anterior Distance (mm) Distance (mm) wall thickness segment shortening 15 15 10 10 apex Time Time

  36. base posterior anterior Wall thickness apex Sample Application – Ventricular Volume Volume Volume • Left ventricle ED ES Wall thickness Wall thickness Distance (mm) Distance (mm) Segment shortening 15 15 15 10 10 Time Time