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. Author manuscript; available in PMC: 2018 Feb 26.
Published in final edited form as: AJNR Am J Neuroradiol. 2016 Nov 17;38(2):270–275. doi: 10.3174/ajnr.A5003

Figure 1.

Figure 1

Arterial arrival times (AAT) were measured from angiographic time-density curves. Regions of interest (ROIs) within normal MCA proximal M1 segment (white arrow, 1A) and from collateralized MCA branches (double arrows, 1A) are identified on composite angiographic images. ROIs were used to calculate time density curves (1B). AAT (in seconds) was defined as the time interval between contrast arrival at the normal M1 segment (interrupted curve, b) and the average of three ROIs at the M3/4 junction of the MCA corresponding to the occluded MCA (continuous curve, b). AAT is graphically depicted by the horizontal double arrow line.