Using Stroke Windows for Detecting Ischemia on Head CT When evaluating a CT head for possible stroke, narrow the window (W: 80 L:40 to W: 40 L: 40). See the difference in this acute left MCA territory stroke. W = Window Width • Narrow window is good for comparing tissues of differing attenuation (blood/lung vs soft tissue) • Wide window is good for comparing tissues of similar attenuation (similar soft tissues) L = Window Level (or Center) By Dr. Thomas Krewson @tomkrewson via Dr. Robert Jones @RJonesSonoEM #Stroke #Windows #Ischemia #HeadCT #Radiology #CTHead #diagnosis #comparison
