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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Neuroimaging Clin N Am. 2011 May;21(2):259–283. doi: 10.1016/j.nic.2011.02.007

Figure 2. Comparison of MR and CT perfusion imaging.

Figure 2

A 59-year-old male presented with slurred speech. DWI and CT angiography were normal, and the patient was subsequently diagnosed with ethanol intoxication. MR perfusion imaging (MRP) was performed 17 minutes after CT perfusion imaging (CTP). Identically sized regions of interest were placed on MRP (left inset, 1×1 pixel) and CTP (right inset, 4×4 pixels) source images in a randomly-selected location in the right corona radiata. The graph shows MR signal intensity and CT density as a function of time, with both expressed in terms of standard deviations above or below the mean value obtained from baseline images acquired before the arrival of the contrast bolus. Note the much larger signal change observed with MRP, compared to the changes observed with CTP, which are barely discernable from random noise fluctuations.