Doppler Measurements

Acquiring Doppler waveforms

  • Optimize 2D image, adjust gain and depth
  • Select the type of Doppler (Pulsed, Continuous, Tissue)
  • Activates cursor
  • Line cursor parallel to flow
  • If PW, place indicator ball/double has in area of interest
  • Select type of Doppler again to obtain signal
  • Acquire waveform, wait 3-5 seconds
  • Freeze waveform
  • Adjust baseline and scale to optimize waveform (see tip of waveform of interest)
  • Scroll through sample to find best representation
  • Save image with no measurement (allow for offline measurements)
  • If difficult image, save and repeat above a few times
  • It is good to have several samples if needed

Preforming Doppler measurements

  • Two primary measurements, peak velocity (V pk) and velocity time integral (VTI)
  • V pk is the distance from the baseline to the tip of the curve
  • VTI is the sum of distances under the curve
  • Visual assessment of the waveform pattern for hepatic, portal and renal assessments
  • Optimize frozen waveform (increase gain if needed to see full wave, and adjust scale and baseline to see entire wave)
  • Spend a few seconds to make sure you know which wave is the one of interest
  • Select correct measurement from calculation package

V pk (Figure 1)

  • Mark the peak of the wave and select enter
  • System knows where the baseline is
  • Save measurement

VTI (Figure 2)

  • Start at the baseline to the left of the curve
  • Trace along the edge of the curve
  • Stay tight to the curve
  • Follow it down to the right side of the curve
  • Select enter
  • Save image


There will be some differences between systems, but they all work in the same basic way


Figure 1 - Peak Velocities

Figure 2 - VTI


Chan, Vincent, and Anahi Perlas. “Basics of ultrasound imaging.” Atlas of ultrasound-guided procedures in interventional pain management. Springer, New York, NY, 2011. 13-19.