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These protocols are based on a 128 slice dual source Siemens CT. Some factors may need to be adjusted for a different CT.

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CT - Rotational Profile

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Indication Discrepancy in Leg lengths and rotation of limbs
Patient Position - feet first
- supine
- legs evenly positioned and internally rotated
- toes touching

Immobilise with cushions and straps when necessary.

Scanogram use separate accession number position as above.
Scan Area Rotational Profile:
1- Hips- From acetabular roof to the lesser trochanter.
2- Distal Femur - Proximal Tibia
4- Distal Tibia
     See diagram below for required images.
Iliac crests to distal surface of the Os Calsis using gonad shielding.
 kV/Quality Ref mAs/
Time per Rotation
Care kV off
Care dose 4D on
80 100 0.5
Detector Collimation 0.6
Slice Thickness 3mm Pitch 0.8
IV Contrast  Nil
Care Bolus Nil
Scan Delay Nil
Reconstructions 3mm and 0.75mm   B31f  Pelvis
3mm and 0.75mm   B70s Bone
10mm B70s Bone
Post Processing 3mm Coronal B70 Bone Bilateral Hips, Knees and Ankles

Occasionally a series of sequential scans can be used to obtain the required imaging. Use the diagram below as a guide to obtain:
1. Hips - Acetabular roof to the lesser Trochanter 
2. Distal Femur
3. Proximal Tibia
4. Distal Tibia 

rotational profile

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  • Date last published: 12 December 2017
  • Document type: Imaging Protocol
  • Services responsible: Paediatric Radiology

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