COLOUR‐CODED CAROTID DOPPLER IMAGING

AN ANGIOGRAPHIC COMPARISON OF 324 BIFURCATIONS

Nigel Ackroyd*, Rodney Lane, Linda Dart, Michael Appleberg

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The accuracy of a colour‐coded Doppler ultrasound imaging system in the assessment of the extracranial carotid tree is presented. A series of 162 consecutive patients (324 bifurcations) were assessed with angiographic control. Doppler frequency shifts of between 3600 and 5000 Hz, corresponding to yellow on the colour code, detected carotid arteries that were stenosed ≥ 50% with a sensitivity of 95%, a specificity of 72% and an overall accuracy of 81%. At frequency shifts of over 5000 Hz corresponding to the blue code, the sensitivity was 83%, specificity 90% and accuracy 87%. With highly stenosed lesions (90–99%), 24% were incorrectly diagnosed as occlusion by the imager. In those cases with a haemodynamically significant lesion on one side there is no evidence of a compensatory increase in velocity on the other side. The technique is readily learnt but an awareness of its pitfalls is essential for accurate scanning and these are discussed. Carotid Doppler imaging has superseded phono‐angiography and peri‐orbital Doppler examination in our laboratory and is used with the oculoplethysmograph in the routine assessment of patients with suspected carotid bifurcation disease.

Original languageEnglish
Pages (from-to)509-517
Number of pages9
JournalAustralian and New Zealand Journal of Surgery
Volume54
Issue number6
DOIs
Publication statusPublished - 1984
Externally publishedYes

Keywords

  • angiography
  • carotid atherosclerosis
  • colour‐coded
  • continuous wave
  • Doppler imaging
  • ultrasound

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