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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 9. Effect of perfusion scan duration on CBV maps.

Figure 9

CBV maps were made from the perfusion data shown in Figures 1 and 8. Maps were made using the entire scan, which lasted 110 seconds after contrast injection, as well as truncated data sets simulating the effects of shorter scan durations lasting 20, 30.5, 39.5, and 60.5 seconds after contrast injection. With the shortest scan duration of 20 seconds, there is a region of very low apparent CBV, which is much larger than the DWI lesion. With progressively longer scan durations, the size of the apparent CBV lesion shrinks. With the full 110-second scan duration, there is only a poorly delineated region of slightly reduced CBV that is considerably smaller than the DWI lesion.