Ability of “experienced” clinicians to recognise features of early infarct on CT

What the ECASS book saidPresentPresentAbsentAbsentSpecificitySensitivity
What the experienced clinicians saidPresentAbsentPresentAbsent
Dense MCA12190411.000.39
Loss of basal ganglia outline17318160.670.35
Loss of insular ribbon11432160.890.20
Effacement of sulci10321290.970.24
Ventricular effacement6242400.950.20
  • The numbers are the absolute number of observations by the six experienced observers on the 12 “abnormal” scans (72 observations in all).