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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.

Guideline identity image

CT - Choanal Atresia

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Indication  Obstructed nasal passages
Patient Preparation The nasal passages need to be cleared just prior to the CT by nursing staff with Otrivine drops and suctioned
Patient Position Head in headrest with the hard palate perpendicular
Scan Area From the hard palate to the top of the Ethmoid Sinuses
kV/ Quality ref mAs/
Time per rotation
Care Dose 4D on
Care KV semi
100 80 1.0s
Detector Collimation 0.6mm
Slice Thickness 2mm Pitch  0.55
IV Contrast Nil
Care Bolus Nil
Scan Delay Nil
Reconstructions 2mm      H70h  Bone
2mm      J30s  Orbits
0.75mm  H70h  Bone
0.75mm  J30s  Orbits
Post Processing

2x2mm  H70h  Bone Coronal and Sagittal MPR
2x2mm  J30s  Orbits Coronal MPR
Saphire2 on Orbit Reconstructions

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  • Date last published: 05 October 2017
  • Document type: Imaging Protocol
  • Services responsible: Paediatric Radiology

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