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Doppler

The Doppler effect refers to the change in the frequency of a wave (like sound or light) observed when the source of the wave and the observer are moving relative to each other. It’s named after physicist Christian Doppler, who described the phenomenon. A common example is the change in pitch of an ambulance siren as it approaches and then moves away from you

Doppler Ultrasound Study:

  • Doppler ultrasound is a non-invasive medical test that uses high frequency sound waves to measure and visualize blood flow in blood vessels.
  • It works by analyzing the change in frequency of sound waves reflected by red blood cells moving within the vessels.
  • It’s used to examine blood flow in various parts of the body, including the heart, neck, arms, and legs.
  • Doppler ultrasound can help detect narrowed or blocked arteries, blood clots, and other blood flow problems.

Different modes of Doppler ultrasound provide different types of information about blood flow:

They include-

  • Color Doppler : changes into different colors to show the direction of blood flow.
  • Pulsed wave ( Spectral) Doppler : Graphical representation of blood flow over time. Helps to measure the blood flow rate, and its pattern.
  • Continuous wave Doppler:
    1. Duplex ultrasound : Combines normal ultrasound pictures with Spectral Doppler. It helps to check the width of blood vessels and take the measurements at the right site. 
    2. Triplex ultrasound : Combines normal ultrasound pictures with Spectral Doppler and Colour Doppler, It can help to check the correct site in the blood vessel for placing the measurement, and to visually check the flow at the point of blockages. 
    3. Power Doppler : This test is used to very slow blood flow. It doesn’t show the direction of blood flow. 
  • Indications for Doppler USG :
    1. Deep Vein thrombosis (DVT)
    2. Varicose Veins.
    3. Peripheral Arterial Disease
    4. Atherosclerotic arterial changes
    5. Major Stroke Incidents
    6. Vascular trauma
    7. Tumour Vascularity
    8. Vascular Anomalies & Malformations
    9. AV Fistulas for Dialysis
    10. Diabetic foot syndrome
    11. Maternal Applications – PET Risk Assessment & followup
    12. Fetal Growth discrepancies.
    13. Renal vascular HT
    14. Transplant study.

What happens during a Doppler ultrasound?

Be prepared : Wear loose fitting clothes. Fasting is not necessary for most of the studies, except for some, like Renal Doppler. The test may take 15 -30 minutes, depending upon the study. Empty Urinary Bladder before study.

Please carry old reports, and details of treatment. The test is performed by a doctor, who may need to look at your clinical details.

Be prepared to remove any surgical dressing of wounds in the involved body parts.