Acquisition Phase

Phase Included

Scan Delay

Respiration Phase

Anatomical Coverage

Non Contrast

Yes

N/A

Inspiration

Lung apices through the diaphragm to include both adrenal glands

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: If IV contrast is warranted, venous phase imaging is routinely performed with a 40-60 second delay. A flash spiral mode can be used to improve scan speed and limit breathing artifact if the patient is short of breath. All scans are performed using the ALARA principle

 

Technical Parameters

Parameters

kVp

Care kV (ref. kV 120)

Effective mAs

CareDose

Care Dose Reference mAs

150

Time (Rotation)

0.5 sec

Average Acquisition Time

3-4 sec

Collimation

128 x 0.6mm

Pitch Value

1.0

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

 3mm

 0.75mm

 3mm

Reconstruction Spacing

 3mm

 0.5mm

 3mm

Reconstruction Algorithm

 B30f

 B20f

 B80f

Window Width and Level

 410/10

410/10

 1600/-500

Reconstruction Comments: A high resolution reconstruction is also performed using 1mm x 10mm slices, a B80f 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

120ml

Saline Flush

N/A

Injection Rate

2-3ml/sec

Oral Contrast

N/A

Contrast Volume

N/A

Comments:IV contrast is not routinely necessary, however, if warranted we use the above protocol.