The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.

You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 3. —Graph shows receiver operating characteristic (ROC) curves for standardized (solid line) and nonstandardized (dotted line) peak systolic velocities for moderate to severe middle cerebral artery narrowing spasm. Area of high sensitivity of ROC curve is above dashed-and-dotted horizontal line at 0.75. Best efficiency (94%) was associated with nonstandardized velocity threshold of 182 cm/sec and with threshold of 170% of standardized peak systolic velocity. A_z (total area under ROC curve) = 0.934 for standardized, 0.923 for nonstandardized velocities. A_zp (partial area under ROC curve) = 0.214 for standardized, 0.204 for nonstandardized velocities.