Table 2. Correlation factors of MPI-derived velocities.

Diameter [mm]	rFDHM	pFDHM	rdilution	pdilution
4	0.966	0.002	0.911	0.012
6	0.975	0.001	0.892	0.017
10	0.632	0.178	0.657	0.156

This table shows the Pearson’s correlation factors of the FDHM and TD method for the three different glass tubes. For the 4 mm and 6 mm inner diameter glass tubes, MPI-derived velocities showed good agreement with the reference ones. In contrast, computed velocities yielded inferior results for the 10 mm inner diameter glass tube.