Acquisition Phase

Phase Included

Scan Delay

Respiration Phase

Anatomical Coverage

Non Contrast

N/A

N/A

N/A

N/A

Arterial Phase

N/A

N/A

N/A

N/A

Venous Phase

Yes

40-60 sec.

Inspiration

Lung apices through the diaphragm to include both adrenal glands

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 with a 40-60 second delay. All scans are performed using the ALARA principle.

 

Technical Parameters

Parameters

kVp

Care kV (ref. kV 110)

Effective mAs

CareDose

Care Dose Reference mAs

100

Time (Rotation)

0.5 sec.

Average Acquisition Time

3-4 sec.

Collimation

128 x 0.6 mm

Pitch Value

1.2

Scan Direction

Craniocaudal

Comments: CareDose is used to reduce patient dose. 100 kVp can be used for most average size patients which will significantly reduce patient dose.

 

Reconstruction Parameters

Soft Tissue

Thin Data

Lung

Slice Thickness

 3 mm

 0.75 mm

 3 mm

Reconstruction Spacing

 3 mm

 0.5 mm

 3 mm

Reconstruction Algorithm

I30f

I26f

I70f

Window Width and Level

 410/10

 410/10

 1600/-500

Reconstruction Comments: A high resolution reconstruction is also performed using 1 mm x 10 mm slices, an I70f kernel, and a window width and level of 1600/-500. Coronal and sagittal image reconstructions are also performed.

 

Contrast Parameters

Parameters

Contrast Type

Non-ionic

Contrast Volume

120 mL

Saline Flush

N/A

Injection Rate

2-3 mL/sec.

Oral Contrast

N/A

Contrast Volume

N/A

Comments: A fixed delay of 40-60 seconds is optimal.