Role of magnetic resonance imaging in the management of perianal Crohn’s disease

Insights into Imaging

Table 1 Possible protocols for MRI acquisition

	Sequence					FOV	Slice thick (mm)	Slice gap	Acc factor	Fat sat
	Philips	Siemens	GE	Toshiba	Hitachi	FOV	Slice thick (mm)	Slice gap	Acc factor	Fat sat
Sagittal T2-weighted	TSE	TSE	FSE	FSE	FSE	260 × 260	≤4	0	2	NO
Oblique axial T2-weighted	TSE	TSE	FSE	FSE	FSE	260 × 260	≤4	20%	2	NO
Oblique axial T2- weighted with fat saturation	SPIR-TSE	FS-FSE	CS-FSE	MSOFT-FSE	FS-FSE	260 × 260	≤4	20%	2	YES
Oblique coronal T2-weighted	TSE	FSE	FSE	FSE	FSE	260 × 260	≤4	20%	2	NO
Oblique axial diffusion weighted imaging	Diffusion-weighted imaging EPI planar					380 × 380	≤4	10%	2	YES
Oblique axial 3D T1 W GE with fat saturation (Gd)	THRIVE	VIBE	LAVA	QUICK 3D	TIGRE	380X380	≤3	0	3	YES
3D T2 weighted sequence	VISTA	SPACE	CUBE	3D MVOX	isoFSE	260 × 260	≤1.5	0	3	NO

FSE, fast spin echo; TSE, turbo spin echo; SPIR-TSE, spectral saturation with inversion recovery turbo spin echo; FS-TSE, fat-saturated turbo spin echo; FS-FSE, fat saturated fast spin echo; THRIVE, T1-weighted high-resolution isotropic volume examination; VIBE, volumetric interpolated breath-hold examination; LAVA, liver acquisition with volume acceleration-extended volume; QUICK 3D, Toshiba name of the sequence, not an acronym; TIGRE, T1-weighted gradient echo with RF fat saturation; DWI, diffusion-weighted imaging; VISTA, volume isotropic turbo spin echo acquisition; SPACE, sampling perfection with application optimised contrasts using different flip angle evolution; CUBE, GE name of the sequence, not an acronym; 3D MVOX, 3D multivoxel; isoFSE, iso fast spin echo