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: Non-contrast and delayed images may be necessary when following up stent placement or to r/o endovascular leak. Alternatively, dual energy can be used to provide virtual non-contrast images. All scans are performed using the ALARA principle. 3D post-processing is performed with this protocol.

Technical Parameters

Parameters

kVp

120

Effective mAs

Use dose reduction software

Quality 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: Dose reduction software is used to reduce patient dose. The quality reference mAs can be lowered on non-contrast and delayed images (250 mAs).

Reconstruction Parameters

Soft Tissue

Thin Data

Thin Data

Lung

Slice Thickness

 3 mm

0.75 mm

 0.75 mm

3 mm

Reconstruction Spacing

 3 mm

0.5 mm

 0.5 mm

3 mm

Reconstruction Algorithm

I40f (2)

I26f (2)

B20f

I70f (2)

Window Width and Level

410/10

410/10

410/10

1600/-500

Reconstruction Comments: 

Reconstruction Parameters

Coronal

Sagittal

Slice Thickness

 3 mm

3 mm

Reconstruction Spacing

 3 mm

3 mm

Reconstruction Algorithm

I40f (2)

I40f (2)

Window Width and Level

410/10

410/10

Reconstruction Comments: 

Contrast Parameters

Parameters

Contrast Type

Non-ionic

Contrast Volume

120 mL

Saline Flush

N/A

Injection Rate

4-5 mL/sec

Oral Contrast

H2O

Contrast Volume

1000 mL

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