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Suggested CT scanning protocol*
Patient orientation Supine, feet first
Gantry tilt 0°
Region of interest Initial exam: mid-T12 to mid-sacrum
Subsequent exams: One level above to one level below fusion level(s)
Kernel/algorithm B80/bone
Milliamperage (mA) 250
Kilovoltage (kV) 140
Field of view (FOV) 14 cm
Matrix 512 × 512
Volume acquisition slice collimation 1.0 mm
Image reconstruction progression 
    Step 1 Reconstructed axial 3.0-mm-thick sections; entire scan volume
    Step 2 Reconstructed axial 1.0-mm-thick sections at 0.5-mm increments (overlapped); region of interest only
    Step 3 Reformatted images in 3 planes; region of interest; 1.0 mm axial (parallel to the disc); 3.0 mm coronal and sagittal
    Window and level settings 2000–3000/350–400
* Multisection (4) CT scanner.

Patient orientation	Supine, feet first
Gantry tilt	0°
Region of interest	Initial exam: mid-T12 to mid-sacrum
	Subsequent exams: One level above to one level below fusion level(s)
Kernel/algorithm	B80/bone
Milliamperage (mA)	250
Kilovoltage (kV)	140
Field of view (FOV)	14 cm
Matrix	512 × 512
Volume acquisition slice collimation	1.0 mm
Image reconstruction progression
Step 1	Reconstructed axial 3.0-mm-thick sections; entire scan volume
Step 2	Reconstructed axial 1.0-mm-thick sections at 0.5-mm increments (overlapped); region of interest only
Step 3	Reformatted images in 3 planes; region of interest; 1.0 mm axial (parallel to the disc); 3.0 mm coronal and sagittal
Window and level settings	2000–3000/350–400