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Table 3: “Core” and “preferred” imaging protocols for diffusion-weighted imaging
Parameter “Core” “Preferred” No. 1 (High Angular Resolution) “Preferred” No. 2 (More b-Values)
Orientation Axial Axial Axial
Coil Any Phased array ≥8 channels Phased array ≥8 channels
Readout EPI EPI EPI
TR (ms) ∼9000 ∼9000 ∼9000
TE (ms) Min Min (<100) Min (<100)
FOV (mm²) 256 × 256 or 350 (66% phase) 256 × 256 or 350 (66% phase) 256 × 256 or 350 (66% phase)
Matrix size 128 × 128 128 × 128 128 × 128
Sections/thickness (mm) Any/≤3 59/2.7 59/2.7
Section gap (mm) 0 0 0
Voxel size (mm) ≤3 in all dimensions Isotropic 2.7³ Isotropic 2.7³
Directions ≥12 64 ≥12
Dual-echo Any No No
Fat-suppression Any Yes Yes
Phase-encode direction A to P A to P A to P
BW (Hz/pixel) 1346 1346 1346
Parallel imaging factor Any 2 2
b-value (s/mm²) 2 (0, ∼1000) 2 (0, 1300) ≥3 (eg, 0, ∼1000, ∼2000)
No. b=0 images 1 1 per 8 directions if allowed 1 per 8 directions if allowed
Note:—Min indicates minimum; A to P, anterior to posterior; BW, bandwidth.