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AJNR - American Journal of Neuroradiology

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Diagnosis of Internal Carotid Artery Stenosis Greater than 70% with Power Doppler Duplex Sonography

Masatoshi Koga^a, Kazumi Kimura^a, Kazuo Minematsu^,a and Takenori Yamaguchi^a

^a From the Cerebrovascular Division, Department of Medicine, National Cardiovascular Center, 5-7-1 Fujishirodai, Suita, Osaka 565-8565, Japan. Address reprint requests to Kazuo Minematsu, MD.

View larger version (82K): [in a new window]   FIG 1. A, Lateral view of left common carotid angiogram shows 70% ICA stenosis by the NASCET method (arrow). B, Color Doppler image shows severe ICA stenosis (arrow). C, Power Doppler image shows 82% ICA stenosis by the linear stenosis parameter (arrow). D, Flow velocity of poststenotic lesion indicates that PSV is 307 cm/s (arrow).

View larger version (15K): [in a new window]   FIG 2. Scatterplot shows correlation between degree of stenosis by the NASCET method and linear stenosis (r = .82, P < .0001)

View larger version (13K): [in a new window]   FIG 3. Scatterplot shows correlation between degree of stenosis by the NASCET method and area stenosis (r = .78, P < .0001)

View larger version (12K): [in a new window]   FIG 4. Scatterplot shows correlation between degree of stenosis by the NASCET method and PSV (r = .84, P < .0001)

View larger version (14K): [in a new window]   FIG 5. A sensitivity-specificity curve by linear stenosis. An optimal threshold value of linear stenosis for predicting ICA stenosis greater than 70% is 74.7%

View larger version (14K): [in a new window]   FIG 6. A sensitivity-specificity curve by area stenosis. An optimal threshold value of area stenosis for predicting ICA stenosis greater than 70% is 83.3%

View larger version (14K): [in a new window]   FIG 7. A sensitivity-specificity curve by PSV. An optimal threshold value of PSV for predicting ICA stenosis greater than 70% is 200 cm/s