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. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: Neuroimage. 2010 Oct 26;54(3):1903–1909. doi: 10.1016/j.neuroimage.2010.10.064

Figure 4.

Figure 4

VT/fP was calculated for caudate using an unconstrained two-tissue compartment model. Scans were analyzed using brain data from time 0 to the specified time on x-axis. VT/fP was expressed as a percentage of terminal value – i.e., VT/fP calculated from the entire 120-min data set. Error bars are identifiability (standard errors %) of VT/fP. Imaging for the initial 80 min provided VT/fP within 10% (dashed lines) of that obtained with the full length data and also provided good identifiability of < 12%. Note that VT and VT/fP have the identical dependency on the length of data.