Acquisition Phase

Phase Included

Scan Delay

Respiration Phase

Anatomical Coverage

Non Contrast

Yes

N/A

Inspiration

Aortic stent only

Arterial Phase

Yes

Bolus triggered

Inspiration

entire aortic vasculature

Venous Phase

N/A

N/A

N/A

N/A

Delayed Phase

Yes

60 sec post-arterial phase imaging

Inspiration

Aortic stent only

Scan Comments: Noncontrast and delayed images are necessary when following up stent placement or to r/o endovascular leak. Alternatively, dual energy can be used to provide virtual noncontrast images.  All scans are performed using the ALARA principle. A 3D Post Processing is performed with this protocol.

 

Technical Parameters

Parameters

kVp

120

Effective mAs

CareDose

Care Dose Reference mAs

290

Time (Rotation)

0.5 sec

Average Acquisition Time

5-7 sec

Collimation

128 x 0.6mm

Pitch Value

0.6

Scan Direction

Craniocaudal

Comments: CareDose is used to reduce patient dose. The CareDose reference mAs can be lowered on noncontrast and delayed imaging.

 

Reconstruction Parameters

Soft Tissue

Thin Data

Lung

Slice Thickness

 3mm

 0.75mm

 3mm

Reconstruction Spacing

 3mm

 0.5mm

 3mm

Reconstruction Algorithm

 I40f

 B20f / I26f

 I70f

Window Width and Level

 410/10

410/10

 1600/-500

Reconstruction Comments: Coronal and sagittal image reconstructions are also performed.

 

Contrast Parameters

Parameters

Contrast Type

Non ionic

Contrast Volume

120ml

Saline Flush

N/A

Injection Rate

4-5ml/sec

Oral Contrast

H2O

Contrast Volume

1000ml

Comments: Bolus tracking is performed off the abdominal aorta using a 230 HU trigger setting.