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[Velocity variance function: additional information in color-coded Doppler sonography of the carotids]
S Trattnig1, B Schwaighofer, P Hübsch
1Abteilung für diagnostische Radiologie, II. Med. Universitätsklinik Wien.
Rofo : Fortschritte Auf Dem Gebiete Der Rontgenstrahlen Und Der Nuklearmedizin
|December 1, 1990
Summary
A new velocity variance program enhances visualization of carotid bifurcation flow disturbances. This tool aids in assessing stenosis severity and plaque surface irregularity, improving diagnostic accuracy.
Area of Science:
- Vascular Ultrasound
- Hemodynamics
- Medical Imaging Software
Background:
- Carotid bifurcation atherosclerosis is a significant cause of stroke.
- Accurate assessment of flow disturbances is crucial for evaluating stenosis severity.
- Current ultrasound methods may not fully visualize localized flow abnormalities.
Purpose of the Study:
- To evaluate a new velocity variance program for color Doppler sonography.
- To assess its efficacy in visualizing flow disturbances in carotid bifurcation stenosis.
- To correlate flow disturbance characteristics with stenosis grade and plaque morphology.
Main Methods:
- Systematic application of the velocity variance program in color Doppler sonography.
- Study included 59 patients with varying grades of carotid bifurcation stenosis.
- Direct comparison of imaging with and without the new software.
Main Results:
- Flow disturbances were maximal downstream of stenosis and dissipated within 8-10 vessel diameters.
- A direct correlation was found between disturbed flow region size and plaque surface irregularity.
- The velocity variance program revealed local flow disturbances in 18/27 patients with <50% stenosis, previously undetected.
Conclusions:
- The velocity variance program improves visualization of flow disturbances in carotid stenosis.
- It aids in characterizing hemodynamic alterations related to plaque morphology.
- This non-invasive tool enhances in-vivo assessment of carotid bifurcation hemodynamics.