Acquisition Phase

Phase Included

Scan Delay

Respiration Phase

Anatomical Coverage

Non Contrast

Yes

N/A

Inspiration

Nasopharynx through the diaphragm

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 high resolution flash spiral scan may be useful if the patient is short of breath to avoid breathing artifact. All scans are performed using ALARA principle. 3D post-processing is performed with this protocol.

Technical Parameters

Parameters

kVp

Care kV (ref. kV 120)

Effective mAs

Use dose reduction software

Care Dose Reference mAs

185

Time (Rotation)

0.5 sec

Average Acquisition Time

4-6 sec

Collimation

128 x 0.6mm

Pitch Value

1.0

Scan Direction

Craniocaudal

Comments: Dose reduction software is used to reduce patient dose and reduce image noise, specifically in the shoulder region. 100 kVp can also be used on average size patients.

Reconstruction Parameters

Soft Tissue

Thin Data

Lung

Coronal

Slice Thickness

 3 mm

0.75 mm

 3 mm

3 mm

Reconstruction Spacing

 3 mm

0.5 mm

 3 mm

3 mm

Reconstruction Algorithm

B30f

B20f

B80f

B20f

Window Width and Level

410/10

410/10

1600/-500

410/10

Reconstruction Comments: Coronal and sagittal image reconstructions are performed aligned to the patient’s trachea.

Reconstruction Parameters

Sagittal

Slice Thickness

 3 mm

Reconstruction Spacing

 3 mm

Reconstruction Algorithm

B20f

Window Width and Level

410/10

Reconstruction Comments: Coronal and sagittal image reconstructions are performed aligned to the patient’s trachea.

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.