MR Perianal Fistula W/WO Protocol
Last updated: 10/12/2021
Charge as: Pelvis W/WO
Scanner preference: 1.5T or 3T
Coil: Torso Coil
- Void before exam
- No need to call the radiologist for planning the Obliques
- Send ADC maps
- Scan on expiration.
- Monitor that patient is breath-holding. Breathe the patient slowly so they have time to follow instructions. Do not start scan until the patient has stopped breathing.
- Give 2L O2 if it will help with breath-holds UNLESS PATIENT HAS COPD OR ANOTHER REASON NOT TO GIVE O2.
|COR||T2||SSTSE BH||5mm||0.5mm||N||top of kidneys to pelvis||Scan sacrum to anterior abdominal wall. CONFIRM GOOD COIL PLACEMENT. Large FOV to include kidneys. Pelvic pathology is often related to renal pathology|
|SAG||T2||TSE||2.5mm||0mm||N||24mm, fit to patient||Mid-femoral head to mid-femoral head. Freq A-P. Consider using an anterior Sat band if lots of abdominal wall motion. Use to plan oblique planes.|
|AX Oblique||T1||TSE||3.5mm||0.8mm||N||18-20mm||Freq A-P to avoid bowel motion ghosting into uterus and bladder. Plan slices axial to the anal canal.|
|AX Oblique||T2||TSE||3mm||0.8mm||N||18-20mm||Freq A-P to avoid bowel motion ghosting into uterus and bladder. Plan slices axial to the anal canal.|
|AX Oblique||T2||TSE FS||3mm||0.8mm||Y||18-20mm||Same parameters as AX OBLIQUE T1 TSE. Freq A-P to avoid bowel motion ghosting into uterus and bladder. Plan slices axial to the anal canal.|
|COR Oblique||T2||TSE FS||3mm||0.8mm||Y||18-20mm||Freq A-P. Plan slices coronal to the anal canal.|
|Axial||T2||VISTA-FS||Y||20-24mm, fit to patient||Scan from Iliac crest to butt cheeks. If the scan time becomes too long, decrease scan range, but the lower rectum, anus, and perineum must be included. Please do if on 3T.|
|AX Oblique||T1||3D thrive high resolution pre||Y||Match AX OBLIQUE T2 TSE||HIGH RESOLUTION THRIVEs. Same parameters as AX OBLIQUE T2 TSE.|
|Hand Inject Contrast|
|SAG||T1||3D thrive post- BH||Y||Medial femoral head to medial femoral head|
|AX Oblique||T1||3D thrive high resolution post-contrast||Y||Match AX Oblique TSE T2||HIGH RESOLUTION THRIVEs. Match parameters as AX OBLIQUE HI-RES THRIVE pre-contrast.|
|COR Oblique||T1||3D thrive high resolution post-contrast BH||Y||Match COR Oblique TSE FS T2||Match COR Oblique TSE FS T2|
|AX Oblique||T2||DWI||5mm||1mm||SPIR||Match AX Oblique TSE T2||Trigger & track. Free-breathing sequence, so please position slices accordingly. B=0, 500, 1000.|