Fig 3.

Quantitative measurement of truncation artifacts caused by scans of different durations. Mean values of the 3 different CBV measurements (A), the 2 different CBF measurements (B), the 4 different MTT measurements (C), and the 2 different Tmax measurements (D), averaged across all patients, for scan durations ranging from 39.5 to 110 seconds after contrast injection. The curves in each graph were fitted by logarithmic regression, which showed a significant (P < .001) decrease in every calculated parameter with decreasing scan time. However, the magnitude of this reduction was much smaller for CBF than for the other parameters.