High-resolution direct magnetic resonance imaging fistulography with hydrogen peroxide for diagnosing anorectal fistula: A preliminary retrospective study

Table 2 Magnetic resonance imaging protocol.

Sequences	TR (millisecond)	TE (millisecond)	Slice thickness (mm)	Slice spacing (mm)	FOV (mm)	NSA	Voxel size (mm3)
Low-spatial-resolution MRI protocol
Sagittal T2WI TSE	3000	100	7	1.5	250 × 350	1	0.87 × 1.16 × 7
Oblique axial T2WI TSE	3361	80	6	1	300 × 400	1	1.1 × 1.39 × 6
Oblique coronal T2WI TSE	3000	100	4	0.4	250 × 250	1	0.87 × 1.16 × 4
Oblique axial/coronal T1WI-TSE	520	10	6	1	300 × 400	1	1 × 1.15 × 6
High-resolution direct HPMRI fistulography protocol
Oblique axial/coronal 3D-T2WI-FSE	2000	244	2	-1	200 × 200	2	1 × 1 × 2
Oblique axial/coronal T1WI-mDIXON-TFE	6.4	2.1	3	-1.5	200 × 200	1	1 × 1 × 3
Oblique axial/coronal T1WI-mDIXON-TFE (postcontrast)	6.4	2.1	3	-1.5	200 × 200	1	1 × 1 × 3

FOV: Field of view; HP: Hydrogen peroxide; MRI: Magnetic resonance imaging; TE: Echo time; TR: Repetition time; TSE: Turbo spin echo; NSA: Number of signal averages.