Article Figures & Data
Figures
- Fig 1.
A, Axial section of an MRA image. B, Anteroposterior view of a 3D vessel model generated from MRA. Cyan indicates the left middle cerebral circulation; red, the anterior cerebral distribution; blue, the right middle cerebral circulation; gold, the posterior circulation.
- Fig 2.
Illustration of abnormal tortuosity. A, Drawing of a healthy intracerebral vessel. The vessel is gently curved. B, Drawing of abnormal tortuosity by SOAM. There are irregular sharp high-frequency low-amplitude curves superimposed on the basic vessel shape. C, Drawing of abnormal tortuosity by ICM. The vessel has elongated and possesses marked C- or S-shaped curves. D, 3D rendering of abnormal SOAM and abnormal ICM values in the same vessel segmented from MRA in 2 different subjects. Left: Healthy vessel. Right: Vessel in a patient with cancer. The vessel possesses abnormal tortuosity by both SOAM and ICM.
- Fig 3.
Scatterplots giving vessel-attribute measures in high-activity (light gray) and low-activity (dark gray) subjects. The 3 horizontal lines along each set of scatterplots represent the mean and the mean ± 1 SD. Stars indicate a significant difference (P < .05) between subjects of high and low activity as determined by at least 1 of the statistical measures used. A, Vessel number. B, Average vessel radius (AVR). C, Tortuosity measured by SOAM. D, Tortuosity measured by ICM. H indicates high; L, low; W.H., whole-head circulation; Ant, anterior cerebral circulation; Post, posterior circulation; Left, left middle cerebral circulation; Right, right middle cerebral circulation.
- Fig 4.
Comparison of high-activity (light gray) and low-activity (dark gray) groups by the number of vessels of graded radius. Colored bars represent the mean value and vertical lines, the SD. Stars denote statistically significant differences (P < .05) between activity groups. Note that the smallest and largest bins have ranges of >0.1 mm to encompass all vessels. PCA indicates posterior circulation.
