Acquisition Phase

Phase Included

Scan Delay

Respiration Phase

Anatomical Coverage

Non Contrast

Yes

N/A

Hold

Maxillary sinus through frontal sinus

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:A flash spiral mode can be used to improve scan speed and limit breathing artifact if the patient is short of breath. If IV contrast is warranted, venous phase imaging is routinely performed using a scan delay based on the patient’s age, weight, and body habitus. All scans are performed using the ALARA principle.

 

Technical Parameters

Parameters

kVp

Care kV (ref. kV 90)

Effective mAs

CareDose

Care Dose Reference mAs

80

Time (Rotation)

1.0 sec

Average Acquisition Time

2-3 sec

Collimation

192 x 0.6mm

Pitch Value

0.8

Scan Direction

Caudocranial

Comments:CareDose is used to reduce patient dose.

 

Reconstruction Parameters

Soft Tissue

Thin Data

Bone

Slice Thickness

 3 mm

 0.75 mm

 3 mm

Reconstruction Spacing

 3 mm

 0.5 mm

 3 mm

Reconstruction Algorithm

 Hr40

 Hr59

Hr59

Window Width and Level

350/50

2500/500

2500/500

Reconstruction Comments: Additionally, a soft tissue thin data set is also performed using 0.75 mm x 0.5 mm slices with an Hr40 algorithm and a window width and level of 350/50. Coronal and sagittal image reconstructions are also performed.

 

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.