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Table 1: Parameters for carotid MR imaging protocols at 3T
Parameter T1WI With or Without Contrast Enhancement T2WI TOF Imaging CE-MRA
Acquisition mode 2D 2D 3D 3D
Acquisition sequence Fast spin-echo Fast spin-echo Spoiled gradient and flow compensation Enhanced gradient recalled-echo
Blood suppression technique Quadruple inversion recovery Multisection double inversion recovery Saturation veins None
TE (ms) 11 52 3.5 1.7
TR (ms) 800 4000 23 5.5
TI (ms) 520 250 n/a n/a
Echo-train length 10 12 n/a n/a
Excitation flip angle (degrees) 90 90 20 30
No. of signals acquired 1 2 1 
FOV^a 160 × 130 mm 160 × 120 mm 160 × 160 mm 150 mm
Matrix size 256 × 256 256 × 256 288 × 256 256 × 256
No. of sections 18 18 48 40
Section thickness (mm) 2 2 1 0.8
Coverage (mm) 36 36 44 32 mm
Imaging time (min:sec) 5:49 4:32 4:46 0:59
a The FOV of 140 × 140 cm was also used in some patients.