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

To include the 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: Dual energy is useful for post processing applications such as bone removal and virtual non contrast. Utilizing these processing techniques it is possible to eliminate the noncontrast image acquisition phase when following up Aortic stent placement.  All scans are performed using the ALARA principle.

 

Technical Parameters

Parameters

kVp

100 / 140

Effective mAs

CareDose

Care Dose Reference mAs

250 / 193

Time (Rotation)

0.5 sec

Average Acquisition Time

10 - 15 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 4D is used to significantly reduce patient exposure. 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

1mm

Reconstruction Algorithm

D30f

D20f

D30f

Window Width and Level

410 /10

410 /10

410 /10

Reconstruction Comments: When generating mixed images the DE composition is set to 0.8. Coronal and Sagittal images are also performed.

 

Contrast Parameters

Parameters

Contrast Type

Non ionic

Contrast Volume

120 ml

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. .