Doppler 103
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This document provides an overview of Doppler ultrasound principles and flow patterns, including: - The Doppler spectrum shows velocity, frequency, direction, and number of red blood cells at a given velocity. Common flow patterns include laminar, plug, disturbed, and turbulent. - Laminar flow has a narrow spectrum and whistling quality. Plug flow has an even narrower spectrum. Disturbed flow has spectral broadening and a less obvious window. Turbulent flow has a very broad spectrum and may be bidirectional. - Arterial stenosis causes changes in velocity that appear earlier on the Doppler spectrum as stenosis increases. Aneurysms have distinct inflow and outflow patterns without a yin yang appearance
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Beginners guide to understand the concepts and techniques of Doppler USG imaging -types , technical info,subtypes ,artefacts and interpretation
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Doppler 103
- 2. Review
- 3. Velocity/ Frequency Direction Time The number of cells at this velocity The Doppler Spectrum
- 5. Flow patterns o Laminar (parabolic) o Plug o Disturbed o Turbulent
- 6. Laminar flow
- 7. Laminar flow
- 8. Laminar flow o Narrow spectrum o Window o Middle of the spectrum is brightest corresponding with bulk of highest velocity RBCS o Whistling quality on audio
- 9. Plug flow o Large vessels o Higher velocity, the peripheral layers speed and catch up with the central core o All or most of the blood is flowing at the same velocity o Spectrum is even narrower
- 10. Disturbed o Bifurcations and areas of narrowing o The laminae are no longer orderly but flow is generally forward in direction and may be faster o Spectral broadening o Window less obvious or lost
- 11. Disturbed flow
- 12. Normal eddies
- 13. Turbulent o Very high velocities o Very broad spectra o Most flow is low velocity with brightest components o Might be bidirectional o Very rough easily recognizable audio o Colour doppler mosaic
- 14. Turbulent
- 15. Normal patterns of arterial flow o Low resistance flow o Rapidly growing structures (fetus, tumours), high function rate (brain, kidneys) o Broad systolic peak, Forward diastolic flow o High resistance flow o Those that do not always need a constant blood supply (muscles) o Sharp systolic peak, Absent or reversed diastolic flow
- 16. Distal resistance will change the shape of the waveform High Resistance Low Resistance
- 18. High resistance flow Brachial art Femoral artery
- 20. Signature spectra ICA ICA ECA SFA HV MPV RA
- 22. Arterial Stenosis Velocity Flow volume Stenosis Velocity
- 23. Arterial Stenosis Velocity Flow volume Stenosis Critical Stenosis Velocity changes earlier Velocity falls at severe stenosis Velocity
- 26. © David Bomba, Australia
- 27. Stenosis and jetting of blood
- 28. Coeliac artery stenosis © David Bomba, Australia
- 33. Aneurysms
- 34. Yin Yang
- 35. Aneurysms
- 36. Ying Yang
- 37. Aneurysm
- 38. Poplitial artery pseudoaneurysm Inflow Outflow
- 40. Aneurysm
- 41. Vein of Galen aneurysm The vein of Galen, also known as the great cerebral vein or great vein of Galen, is a short trunk formed by the union of the two internal cerebral veins and basal veins of Rosenthal. It lies in the quadrigeminal cistern
- 42. Vein of Galen aneurym © PK Srivastav, Lucknow
- 43. No yin yang
- 49. Valsalva
- 50. Valsalva
- 52. Hiccup
- 53. Tremors
- 55. Portal Vein Flow in Tricuspid Regurgitation © David Bomba, Australia
- 56. Aortic stenosis, systolic notch in CCA High diastolic flow, blunting of peak, tardus parvus Dichrotic notch
- 57. Hepatic vein
- 58. Probe pressure
- 59. Probe pressure
- 60. Thank you