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Direct B-mode NASCET-style stenosis measurement and Doppler ultrasound as parameters for assessment of internal carotid artery stenosis.
- Source :
-
Australasian Radiology . Mar2002, Vol. 46 Issue 1, p52-56. 5p. 2 Diagrams, 3 Charts, 1 Graph. - Publication Year :
- 2002
-
Abstract
- SUMMARY Doppler ultrasound grading of internal carotid artery (ICA) stenosis using the two parameters of spectral analysis and internal carotid to common carotid artery peak systolic velocity (ICA/CCA PSV) ratio is well established. The improvements in B-Mode ultrasound image quality now make direct ultrasound NASCET-style stenosis measurement possible. We demonstrate that longitudinal B-mode imaging can produce accurate North American Symptomatic Carotid Endarterectomy Trial (NASCET) style measurements which have good correlation with angiographic images. Ultrasound B-mode stenosis measurement provides a third parameter which can be used in conjunction with the two Doppler parameters for the assessment of ICA stenosis. Taking the highest grade of stenosis of the three parameters produces a sensitivity of 100% for the detection of greater than 50% and greater than 80% stenosis with specificity of 66 and 90%, respectively. The performance of satisfactory B-mode imaging against digital subtraction angiography (DSA) was very encouraging. When the B-mode stenosis measurement showed a normal ICA, the positive predictive value (PPV) of the DSA being normal was 94%. When the B-mode stenosis measurement was 35% or less, the PPV of the DSA stenosis being 35% or less was 93%. These excellent results support the use of good quality B-Mode NASCET style stenosis measurement as the initial ultrasound measurement, with Doppler ultrasound only being performed when the B-mode stenosis measurement is greater than 35% or if the B-mode image is unsatisfactory. This approach would save considerable time enabling better utilization of ultrasound resources. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ARTERIAL stenosis
*DOPPLER ultrasonography
Subjects
Details
- Language :
- English
- ISSN :
- 00048461
- Volume :
- 46
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Australasian Radiology
- Publication Type :
- Academic Journal
- Accession number :
- 6533944
- Full Text :
- https://doi.org/10.1046/j.1440-1673.2001.00994.x