Table 2.
Biexponential fit slope constants for manually sampled and image-derived input functions
| Variables | Subjects |
Mean | SD | |||
|---|---|---|---|---|---|---|
| S1 | S2 | S3 | S4 | |||
| Slope 1 | ||||||
| MFB | 2.268 | 2.521 | 3.575 | 6.096 | 3.615 | 1.748 |
| Plasma | 2.116 | 2.518 | 3.846 | 6.250 | 3.683 | 1.864 |
| IDIF | 1.805 | 1.619 | 3.432 | 4.113 | 2.742 | 1.224 |
| Slope 2 | ||||||
| MFB | 0.003 | 0.009 | 0.031 | 0.010 | 0.013 | 0.012 |
| Plasma | 0.002 | 0.010 | 0.034 | 0.010 | 0.014 | 0.014 |
| IDIF | 0.002 | 0.009 | 0.010 | 0.007 | 0.007 | 0.004 |
Abbreviations: IDIF, image-derived input function scaled to last three plasma samples; MFB, measured full blood activity; plasma, measured plasma activity; S1 to S4, participants; SD, standard deviation.