Table 2.
Imaging pulse sequence scan parameters.
| Parameter (units) | T1-MPRAGE | TOF | CBF Calibration scan | rOxFlow |
|---|---|---|---|---|
| Objective | Brain volume estimation | vessels localization | calibration factor to upscale the SSSBF | CMRO2, CBF, SvO2 quantification |
| Repetition time, TR (ms) | 2200 | 17 | 12 (×4)a | 50 (×2)a |
| Echo time, TE (ms) | 2.43 | 5.56 | 5.52 (head)5.34 (neck) | 5.50 |
| Echo spacing (ms) | N/A | N/A | N/A | 8b |
| Inversion time, TI (ms) | 900 | N/A | N/A | N/A |
| Flip Angle, FA (°) | 8 | 20 | 15 | 20 |
| Bandwidth, BW (Hz/Px) | 250 | 78 | 320 | 278 |
| Recon matrix | 224 × 224 | 256 × 192 | 208 × 208 | 240 × 240 |
| Number and orientation of slices | 160, sagittal | 50, axial | 2c, axial | 1, axial |
| Slice thickness (mm) | 1 | 5 | 5 | 5 |
| Field of view, FOV (mm2) | 224 × 224 | 220 × 220 | 208 × 208 (head)176 × 176 (neck) | 240 × 240 |
| Velocity encoding, VENC (cm/s) | N/A | N/A | 50 (head)80 (neck) | 76 |
| Temporal resolution (s) | N/A | N/A | N/A | 3.4 |
aConsidering the two-velocity encoding gradient settings and the slice(s).
bBetween echoes at equal polarity.
cInterleaved.
CBF: cerebral blood flow; CMRO2: cerebral metabolic rate of oxygen; SSSBF: superior sagittal sinus blood flow; SvO2: venous oxygen saturation; T1-MPRAGE: T1-weighted magnetization prepared rapid gradient echo; TOF: time of flight.