Fig. 2
From: An evaluation of performance measures for arterial brain vessel segmentation
Examples of manually created errors of various intensity levels that were introduced to the ground truth. Examples of false-positive segmentation of structures in green (a–c): a moderate skull error, b severe sigmoid sinus error, c severe orbit error. Examples of false-negative segmentation of vessels in blue (d–f): d omission of internal carotid artery, e severe small vessel error, f omission of the posterior communicating arteries. Radius manipulation of segments (g, h): g subtle boundary error of the M1 segment of the middle cerebral artery, h severe boundary error of the internal carotid artery. Red: True positive voxels, Green: False-positive voxels, Blue: False-negative voxels