Axial Head CT (Head First)

Scan Type

Rotation Length

Axial

Full

Anatomical Reference

OM – Orbital Meatal

Scan Range

1 cm below the base of skull to the vertex of the skull to pass and include the tissue above the skull.

Thick Speed

Detector Coverage: 20 mm

Pitch and Speed: 5mm x 4i

Rotation Time: 0.8

Interval

5mm

SFOV / DFOV

Head / 22mm

kVp

120

mA

Auto mA – 330 mA

Prep Group

Diagnostic Delay

n/a

Contrast Protocol

100 mls Ultravist 370 if contrast is required with a 3 minute scan delay

Image Reconstruction

Recon 1: 5mm x 5mm Axial – Soft 350 WL /50 WW

Recon 2: 20 x 1.25mm Axial – Soft 350 WL / 50 WW

Recon 3: 4 x 4 mm Axial – Bone 2000 WL / 200 WW

Image Reformats

Axial – Parallel to the Base Of skull and the roof of cranium 4 x 4mm

Coronal – perpendicular to the falx cerebri 4 x 4 mm

Indications For Further Scanning

All CT scans from ED/post fall should have an Axial 4/4 Bone reconstruction Algorithm. Post contrast scan should be performed if patients present to ED for the first time with Seizures/suspicious lesion is seen prior to ending the exam