These protocols are based on a 128 slice dual source Siemens CT. Some factors may need to be adjusted for a different CT.
CT - PTBs (petrous temporal bones)
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Saphire 2 on all adult reconstructions
Ensure the FoV is the same size on Right and Left axial and coronal reconstructions.
Reconstruct bilateral axial PTBs 0.4mm MPR after scan and send to PACS.
Using the 0.4 mm R and L fine cuts load into 3D and reconstruct a small range of 1x1mm MPR parallel and perpendicular to superior semicircular canals. Send to PACS.
|Indication||- loss of hearing
- otitis media
- chronic ear infection
- congenital anomaly
|Patient Preparation||Nil by mouth 4 hours prior if iv contrast or sedation required|
|Patient Position||Head first
OM line perpendicular
|Scan Area||From the base of the skull to the top of the mastoid air cells.|
Quality ref mAs/
Time per rotation
Care dose 4D on
Care kV on child and semi adult
|IV Contrast||1 mL Omnipaque 300 per kg if required, maximum 50mls|
|Scan Delay||2 - 3 minutes|
|Reconstructions||0.4mm U75u Inner Ear
4mm U30u Base Orbita
0.4 U75u Inner Ear (Right Ear)
0.4 U75u Inner Ear (Left Ear)
|Post Processing||Axial MPR Right PTB 1x1 mm
Coronal MPR Right PTB 1x1 mm
Axial MPR Left PTB 1x1 mm
Coronal MPR Left PTB 1x1 mm
Axial MPR Bilateral PTBs 0.4 mm
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- Date last published: 14 December 2017
- Document type: Imaging Protocol
- Services responsible: Paediatric Radiology
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