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. Author manuscript; available in PMC: 2013 Aug 15.
Published in final edited form as: AJR Am J Roentgenol. 2010 May;194(5):1330–1336. doi: 10.2214/AJR.09.2845

Figure 2.

Figure 2

88-year-old woman with acute onset of left-sided hemiparesis. CT perfusion reveals qualitative differences in cerebral blood flow (CBF) and mean transit time (MTT) perfusion maps in acute stroke patient for variable arterial input function (AIF) locations using software B (standard deconvolution technique). Marked differences in infarct core are seen when using AIF 2 compared with AIF 1, AIF 3, and AIF 4. Arterial time–attenuation curve (red) with AIF 2 also shows marked flattening with mild delay. Note red curve represents arterial time–attenuation curve. Blue curve represents venous time–attenuation curve. CBV = cerebral blood volume.