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Table 2: A sample MR imaging protocol for the evaluation of VS^{^a}
Sequence FOV (cm) Thickness and Spacing (mm) TR (ms) (or Flip Angle) TE (ms) Matrix Comments
Sag T1 FLAIR 24 5 × 1 2800 9 320 × 224 (TI 858 ms)
Ax DTI 26 3 × 0 8000 Min 128 × 128 
Sag 3D T2 FLAIR FS 27 1.4 7600 120 256 × 256 With Ax and Cor reformations
Ax T2 FLAIR 24 5 × 1 9500 125 352 × 224 Alternative to 3D T2 FLAIR (TI = 2250 ms)
Ax T2 FS 18 3 × 0.5 4917 87 320 × 320 Through PF only
Ax FIESTA 18 0.8 (45°) Min 300 × 300 With Ax and Sag oblique reformations
Ax SWAN or SWI 25 2 Min (15°) 25 320 × 224 Optional
Sag 3D T1 FS+C 25 1.2 600 Min 288 × 288 With Ax and Cor reformations
Ax 3D SPGR+C 25 1.5 (20°) Min 320 × 224 For treatment planning; nonangled orthogonal Ax
Ax T1 FS+C 18 3 × 0.5 2723.5 22 320 × 320 Alternative to 3D T1 FS +C (TI = 111 ms)
Cor T1 FS+C 18 3 × 0.5 2475 Min 383 × 224 Alternative to 3D T1 FS +C (TI = 111 ms)
Note:—SPGR indicates echo-spoiled gradient echo; FS, fat suppression; C, contrast; Sag, sagittal; Ax, axial; Cor, coronal; SWAN, T2 star-weighted angiography; Min, minimum.
↵a Except for the axial 3D SPGR+C, all sequences are referenced to the anterior/posterior commissure line. An axial T2 FLAIR can be performed instead of the sagittal 3D T2 FLAIR. An axial and coronal T1 FS+C can be performed in lieu of a sagittal 3D T1 FS+C.