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Table 3 Focused MRI acquisition protocol for the study of the ano-perineal region

From: Elucidating vaginal fistulas on CT and MRI

Sequence Orientation FOV (mm) Matrix No. of slices Section thickness (mm)b No. of averages TR/TE (ms) (range)c
T2-w TSE Sagittal 240 344 × 388 25 3.5 1–2 2500–5000/90
T2-w TSE Axial/oblique-axial 220 320 × 311 35–40 3 2 2800–5000/90
T2-w TSE Coronal/oblique-coronal 240 344 × 388 25 3.5 1–2 2500–5000/90
FS T2-w SPAIR Axial 240 268 × 262 30–35 3.5 2 3000–5000/90
EPI DW Axial 240 75 × 65 30–35 3.5 3 Shortestd
(if not contraindicated) i.v. paramagnetic contrast medium such as as 1-M gadobutrol (Gadovist, Bayer – Germany) 0.1 ml/kg
  FS T1-w SPIRa Sagittal 240 344 × 388 25 3 1–2 400–700/10
  FS T1-w SPIRa Axial/oblique-axial 220 320 × 311 35–40 3.5 2 400–700/10
  FS T1-w SPIRa (optional) Coronal/oblique-coronal 240 344 × 388 25 3.5 1–2 400–700/10
  1. FOV field-of-view, TR repetition time, TE echo time, T2-w T2-weighted, T1-w T1-weighted, TSE turbo spin-echo, SPAIR Spectral Attenuated Inversion Recovery, EPI echo-planar imaging, DW diffusion-weighted imaging, FS fat-suppressed, SPIR Spectral Presaturation with Inversion Recovery - amay be replaced with volumetric FS T1-w gradient-echo sequences such as THRIVE (T1 high-resolution isotropic volume excitation), LAVA (liver acquisition with volume acquisition) or VIBE (volumetric interpolated breath-hold examination). bMinimal (10%) intersection gap. cAutomatically selected in relation to geometrical parameters. dFour b values (0… 1000 mm2/s)