Acquisition Phase	Phase Included	Scan Delay	Respiration Phase	Anatomical Coverage
Non Contrast	Yes	N/A	N/A	Mastoid air cells through petrous ridges
Arterial Phase	N/A	N/A	N/A	N/A
Venous Phase	N/A	N/A	N/A	N/A
Delayed Phase	N/A	N/A	N/A	N/A
Scan Comments: Careful positioning is important to avoid unnecessary exposure to the eyes. Iso-centering the patient within the gantry is key to image quality. All scans are performed using the ALARA principle.

Technical Parameters	Parameters
kVp	120
Effective mAs	Use dose reduction software
Quality Reference mAs	280
Time (Rotation)	1.0 sec
Average Acquisition Time	16-18 sec
Collimation	16 x 0.3mm
Pitch Value	0.6
Scan Direction	Caudocranial
Comments: Dose reduction software is used to reduce patient dose. Scans times are significantly longer than routine scans due to a small collimator size coupled with a low pitch value to increase resolution.

Reconstruction Parameters	Soft Tissue (B)	Bone (B)	Thin Data (R)	Thin Data (L)
Slice Thickness	2 mm	0.4 mm	0.4 mm	0.4 mm
Reconstruction Spacing	2 mm	0.2 mm	0.2 mm	0.2 mm
Reconstruction Algorithm	U30u	U70u	U70u	U70u
Window Width and Level	350/20	3500/500	3500/500	3500/500
Reconstruction Comments: Decreasing the display field of view for both the right and the left temporal bones will increase spatial resolution. Reconstructions are done both bilaterally and coned down for each temporal bone.

Reconstruction Parameters	Coronal (B)	Coronal (R)	Coronal (L)
Slice Thickness	1 mm	1 mm	1 mm
Reconstruction Spacing	1 mm	1 mm	1 mm
Reconstruction Algorithm	U70u	U70u	U70u
Window Width and Level	3500/500	3500/500	3500/500
Reconstruction Comments: Decreasing the display field of view for both the right and the left temporal bones will increase spatial resolution. Reconstructions are done both bilaterally and coned down for each temporal bone.

Contrast Parameters	Parameters
Contrast Type	N/A
Contrast Volume	N/A
Saline Flush	N/A
Injection Rate	N/A
Oral Contrast	N/A
Contrast Volume	N/A
Comments: IV contrast is not typically necessary for this exam.