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Table 5: Quantitative assessment of global cortical perfusion (mean quantitative values)
Observer 1 Observer 2 Observer 3 Observer 4 Observer 5 Observer 6
CBF (mL/100 g/min) 42.60 36.52 41.44 46.85 51.53 41.58
CBV (mL/100 g) 2.04 1.98 2.13 2.24 2.78 2.01
MTT (seconds) 5.39 5.87 5.35 5.39 5.59 5.50
Note:—CBF indicates cerebral blood flow; CBV, cerebral blood volume; MTT, mean transit time. Observer 1, radiology resident physician; observer 2, neuroradiology attending physician; observer 3, neurology attending physician; observer 4, neuroradiology fellow; observer 5, junior CT technologist; observer 6, senior CT technologist.

	Observer 1	Observer 2	Observer 3	Observer 4	Observer 5	Observer 6
CBF (mL/100 g/min)	42.60	36.52	41.44	46.85	51.53	41.58
CBV (mL/100 g)	2.04	1.98	2.13	2.24	2.78	2.01
MTT (seconds)	5.39	5.87	5.35	5.39	5.59	5.50