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Related Experiment Videos

Variance mapping in colour flow imaging: what does it measure?

G M Baxter1, J Polak

  • 1Department of Radiology, Western Infirmary, Glasgow, UK.

Clinical Radiology
|April 1, 1994
PubMed
Summary
This summary is machine-generated.

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Color Doppler variance mapping does not accurately reflect flow disturbance in carotid stenosis. The technique is most likely to identify aliasing, not the full extent of disturbed flow, limiting its diagnostic utility.

Area of Science:

  • Vascular Ultrasound
  • Hemodynamics
  • Medical Imaging

Background:

  • High-grade carotid stenosis causes flow disturbances, leading to spectral broadening and fluttering in Doppler waveforms.
  • Color flow variance mapping is a proposed method to document these flow disturbances.

Purpose of the Study:

  • To prospectively evaluate the accuracy of color flow variance mapping in documenting flow disturbance in high-grade internal carotid artery stenosis.

Main Methods:

  • Studied 15 patients with >50% internal carotid artery stenosis.
  • Utilized color Doppler variance mapping and traditional color Doppler.
  • Adjusted pulse repetition frequency (PRF) in some cases.

Main Results:

  • Variance mapping corresponded to the point of maximum velocity in all cases.

Related Experiment Videos

  • In >75% stenoses, aliasing and maximal variance occurred at the stenotic jet, not the full disturbed flow length.
  • Decreasing PRF created abnormal variance at the aliasing site in 50-75% stenoses.
  • Maximum flow disturbance (fluttering) was not visualized on the variance map in any stenosis.

    • Conclusions:

    • Color Doppler variance mapping does not accurately reflect the extent of flow disturbance.
    • Variance maps are most likely to indicate sites of aliasing rather than true flow disturbance.