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Parameters of the Obata model
| Symbol | Value | Description |
|---|---|---|
| V0 | - | Resting venous blood volume fraction |
| r0 | 100 s−1 | Taylor expansion of intravascular relaxation rate Δ R21 |
| ν 0 | 80.6 s−1 | Frequency offset at the surface of magnetized vessel |
| TE | 20 or 30 ms | Echo-time of the MRI sequence |
| ε | 0.59 for TE=30ms 0.70 for TE=20ms |
Intrinsic/Extrinsic signal ratio |
| E0 | 0.4 | Baseline oxygen extraction fraction |
| k 1 | 4.3 · ν0· E0· TE | Lumped constant |
| k 2 | ε·r0·E0· TE | Lumped constant |
| k 3 | ε – 1 | Lumped constant |
