Acquisition Phase

Phase Included

Scan Delay

Respiration Phase

Anatomical Coverage

Non Contrast

N/A

N/A

N/A

N/A

Arterial Phase

Yes

Bolus triggered

Inspiration

Diaphragm through lower extremities to include entire vasculature

Venous Phase

N/A

N/A

N/A

N/A

Delayed Phase

N/A

N/A

N/A

N/A

Scan Comments: Dual energy is useful for post processing applications such as bone removal and virtual noncontrast. All scans are performed using the ALARA principle. A 3D Post Processing is performed with this protocol.

 

Technical Parameters

Parameters

kVp

100 / 140

Effective mAs

CareDose

Care Dose Reference mAs

250 / 193

Time (Rotation)

0.5 sec

Average Acquisition Time

20-25 sec

Collimation

32 x 0.6mm

Pitch Value

0.8

Scan Direction

Craniocaudal

Comments: Images are acquired using 100 / 140 kVp setting with a SN filter. CareDose is used to reduce patient dose. The pitch value should remain below 1.0 to reduce any artifacts during post processing.

 

Reconstruction Parameters

Soft Tissue

Thin Data

Additional Recon

Slice Thickness

 3mm

 0.75mm

 1.5mm

Reconstruction Spacing

 3mm

 0.5mm

 1.0mm

Reconstruction Algorithm

 D30f

 Q40f / B20f

 D30f

Window Width and Level

 410/10

410/10

 410/10

Reconstruction Comments: Additionally, a bone reconstruction is performed using 5 mm x 5 mm slices, a B70f algorithm, and a window width and level of 1776/176. When generating mixed images, the DE composition is set to 0.8. Coronal and sagittal image reconstructions are also performed. 3D MIP images are also performed.

 

Contrast Parameters

Parameters

Contrast Type

Non ionic

Contrast Volume

120ml

Saline Flush

N/A

Injection Rate

4-5ml/sec

Oral Contrast

N/A

Contrast Volume

N/A

Comments: Bolus tracking is performed off the abdominal aorta using a 230 HU trigger setting. The injection rate should not exceed 5ml/sec. to protract the contrast bolus.