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AJNR - American Journal of Neuroradiology

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Sonographic NASCET Index: A New Doppler Parameter for Assessment of Internal Carotid Artery Stenosis

Gasser M. Hathout^a,b, James R. Fink^a, Suzie M. El-Saden^a,b and Edward G. Grant^c

^a Department of Radiology, University of California at Los Angeles
^b Department of Radiology, West Los Angeles Veterans Administration Medical Center
^c Department of Radiology, University of Southern California Medical Center, Los Angeles, CA

View larger version (123K): [in a new window]   FIG 1. Left ICA angiogram (lateral projection) shows high-grade (70%) proximal ICA stenosis. The flux proximally (Fluxp) at the point of maximal narrowing must equal the flux distally (Fluxd) along the normal vessel lumen.

View larger version (55K): [in a new window]   FIG 2. Linear regression plot of PSV versus measured NASCET linear percentage angiographic (ANGIO) stenosis (r2 = 0.38).

View larger version (49K): [in a new window]   FIG 3. Linear regression plot of SNI versus measured NASCET linear percentage angiographic (ANGIO) stenosis (r2 = 0.64).

View larger version (89K): [in a new window]   FIG 4. A, Left ICA angiogram (lateral projection) shows 77% stenosis of the proximal ICA by NASCET criteria, with a small plaque ulceration. B–D, Color (B) and spectral Doppler images of the same proximal (C) and distal (D) ICA obtained 1 day before conventional angiography.