CT Protocols: (Brain, ENT, Spine, Vascular) - Department of Radiology

62 Revised 7/22/09 (Gentry/Ranallo)
Temporal Bone: (W/O Contrast) (Protocol – Adult: # 2.10 – Pediatric: # 12.18 & 12.19)
Billing:
Setup:
1. Temporal Bone without
1. Patient Supine, AP and lateral scouts, no gantry angle
2. Only use 16 and 64 slice scanners
3. Patient Positioning: Tilt the patient’s head so that a line connecting the lateral canthus of the
eye and the EAC is perpendicular to the CT tabletop (see below).
4. Start scans at the mastoid tip and finish at the top of the petrous bone (see below)
DFOV:
Patient Age:
1. Recon 1 and Retro Recons: Preferred 20 cm (Range 18-22 cm)
2. Recon 2 and 3 of TB: 9.6 cm
Choose the CT scan factors on the scanner for the proper age range of the patient
1. Child: (3 – 6 years)
2. Infant: (0 – 3 years)
Recons & Reformats:
1. Recon 1: 2.5 mm axial images using a bone algorithm.
2. Recon 2 & 3: Obtain left and right 0.625 mm temporal bone axial images with a DFOV of 9.6 cm.
3. Perform 1 additional Retro Recons to get the following axial images of the entire scan range:
At 20 cm DFOV, standard algorithm, 2.5 mm slice thickness, 1.25 mm increment, (WW/WL:
400/30)
4. Do 1 mm by 1 mm 2D-reformats in the coronal, Stenver’s, and Pöschl planes of each temporal
bone using Recon 2 & 3 as source images (below)