MR SACRUM - COCCYX - SI JOINTS 

​Common Histories / Key Words: Sacroiliitis, Tailbone pain, Fall, Trauma

​CORONAL - Use Sagittal localizer and angle parallel to the length of the Sacrum. Center at S2-S3 disc. Cover the entire sacrum from anterior to posterior. Include the coccyx when appropriate.
■   FOV: 22
■   Matrix: 256 x 224 T1 and 256 x 192 STIR
■   Slice Thickness / Spacing: 4 / 0.5

Sacrum_Coronal

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SAGITTAL - Perpendicular to the Coronal sequences. Use Coronal T1 as a guide. Coverage should include both sacroiliac Joints
■   FOV: 22
■   Matrix: 256 x 256
■   Slice Thickness / Spacing: 4 / 0.5

Sacrum_Sagittal

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AXIAL - Perpendicular to the Sagittal and Coronal sequences. Use Sagittal T1 as a guide. Cover sacrum and coccyx.
■   FOV: 22
■   Matrix: 256 x 224
■   Slice Thickness / Spacing: 4 / 1.5

Sacrum_Axial
sacrum

ROUTINE SACRUM & COCCYX

​ ■   Coronal T1 and STIR (or T2 FS)
 ■   Sagittal T1 and T2 FS
 ■   Axial T1 and T2 FS
    - If contrast is requested, add PRE-CONTRAST Axial T1 FS and POST-CONTRAST Coronal T1 FS, Sagittal T1 FS, and Axial T1 FS 

ROUTINE SACROILIAC JOINTS

​ ■   Coronal T1 and STIR (or T2 FS)
 ■   Axial T1 and T2 FS
  - If contrast is requested, add PRE-CONTRAST Axial T1 FS and POST-CONTRAST Coronal and Axial T1 FS