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. Author manuscript; available in PMC: 2016 May 1.
Published in final edited form as: Neuroimage. 2015 Feb 27;111:329–337. doi: 10.1016/j.neuroimage.2015.02.053

Figure 3.

Figure 3

Automated determination of MRA vessel lumen diameter. (A) The vessel was segmented by using edge-detection technique (green trace). (B) Radial projections perpendicular to the vessel boundary were obtained. The lumen diameter of the ICA (an example) was quantified from point a to point b. The vessel was displayed in (C) image and (D) intensity profile format were flattened. The lumen diameter was defined as the full-width at half-height. (E) The 2 mm segments (red lines) along the artery indicated the lengths over which the diameter was measured. 1: basilar artery (BA), 2: internal carotid artery (ICA), 3: middle cerebral artery (MCA), 4: anterior cerebral artery (ACA), 5: azygos artery, 6: posterior cerebral artery (PCA), 7: pial branch of MCA; 8: pial branch of PCA.