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Table 1: Fast MPF mapping protocol parameters^{^a}
Parameter 3D MT-Weighted^{^b} and Reference GRE 3D T1-Weighted GRE 3D PD-Weighted GRE
TR (ms) 32 20 20
TE (ms) 6.3 (6.1) 6.3 (6.1) 6.3 (6.1)
Flip angle 8° 20° 4°
FOV (mm²) 250 × 250 (240 × 200) 250 × 250 (240 × 200) 250 × 250 (240 × 200)
Acquired/reconstructed in-plane resolution (mm²) 1.5 × 1.5/0.8 × 0.8 1.5 × 1.5/0.8 × 0.8 1.5 × 1.5/0.8 × 0.8
Acquired/reconstructed section thickness (mm) 5/2.5 5/2.5 5/2.5
No. of acquired reconstructed sections 12/24 (40/80) 12/24 (40/80) 12/24 (40/80)
EPI factor 9 9 9
No. of averages 2 2 2
Acquisition time (min:sec) 0:38 (1:55) 0:12 (0:36) 0:12 (0:36)
Note:—PD indicates proton density.
↵a Data in parentheses correspond to the parameters for adult brain scans if different from fetal ones.
↵b Standard manufacturer's off-resonance saturation pulse (3-lobe sinc shape with Gaussian apodization) with the offset frequency of 1.1 kHz, effective flip angle of 520°, and duration of 15 ms was used in the MT-weighted sequence. Acquisition time includes both MT-weighted and reference images, which were sequentially acquired in a single scan using a standard manufacturer's option.