Table 1. Summary of the parameters used in computer simulations.
| Parameter | Value | Unit |
|---|---|---|
| α | 0.85 | |
| f | WM = 20, GM = 60 | ml/100ml/min |
| N | 40 | |
| β | 0.88 | |
| Tex | 100 | ms |
| T1t | WM = 1000 ms, GM = 1330 ms | ms |
| T1b | 1660 | ms |
| T2b* | 80 | ms |
| T2C* | 250 | ms |
The listed parameters are labeling efficiency (α), blood flow (f), pair number of control/tag images (N), exchange time (Tex), longitudinal relaxation time constant of tissue (T1t) and arterial blood (T1b), transverse relaxation time constant of arterial blood (T2b*) and CSF (T2C*), proton density ratio of arterial blood to CSF (β). CSF = cerebrospinal fluid. GM = gray matter. WM = white matter.