​CT IAC TEMPORAL BONES

ROUTINE IAC/TEMPORAL BONES CT

Indication: Cholesteatoma, Hearing loss, Fracture

Position/Landmark

Supine, Head first/ OM

Scout direction

Craniocaudal

Respiration

None

Scan Type

Helical/ Full

Rotation/Pitch/Index

​KV/ mA/ Rotation time (sec): 120 kv / (100-600) Smart mA / 0.8 sec
Pitch/ Speed(mm/rotation): 0.969:1 / 19.37
Noise Index: NI – 7.00

​Detector width x rows = Beam Collimation

0.625mm X 32 = 20mm

Slice Thickness/Spacing Algorithm/Recon

​Recon

1. BILAT IAC
2. RT IAC
3. LT IAC

​Thickness/spacing

0.625mm X 0.625mm
0.625mm X 0.312mm
0.625mm X 0.312mm

​Algorithm

Bone Plus
Bone Plus
Bone Plus

Angle

NONE

Location/FOV

​Start/End Location: Below the tip of the mastoid / to above the Temporal Bone
SFOV: Head
DFOV: Recon 1: BILAT IAC 18cm
                Recon 2: RT IAC 10cm
                Recon 3: LT IAC 10cm

​IV Contrast Volume/Type/Rate: 

75ml Isovue 370 up to 2.5ml/sec.
* Contrast only at Physician/Radiologist request.
Inquire with Radiologist prior to study.

Scan Delay

40 sec

2D/3D

Coronal Reformations of both the RT & LT IAC using the Recon. 2 for the RT and 3 for the LT
Exam is to include all of the Petrous bone.

Images Required in PACS

Scouts, Bilat IAC images, RT & LT IAC images, Coronal RT & LT IAC images and the Dose Report