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

Aortic arch through Circle of Willis

Venous Phase

N/A

N/A

N/A

N/A

Delayed Phase

N/A

N/A

N/A

N/A

Scan Comments: If bone removal is necessary, a Dual Energy CTA Carotid protocol should be used to optimize post-processing. All scans are performed using the ALARA principle. 3D Post Processing is performed with this protocol.

 

Technical Parameters

Parameters

kVp

120

Effective mAs

CareDose

Care Dose Reference mAs

300

Time (Rotation)

0.33 sec

Average Acquisition Time

3-5 sec

Collimation

128 x 0.6mm

Pitch Value

0.35

Scan Direction

Caudocranial

Comments: CareDose is used to reduce patient dose and improve image quality, specifically in the shoulder region.

 

Reconstruction Parameters

Soft Tissue

Thin Data

Bone

Slice Thickness

 3mm

 0.75mm

 3mm

Reconstruction Spacing

 3mm

 0.5mm

 3mm

Reconstruction Algorithm

 B30f

 B20f

 B60f

Window Width and Level

 350/50

350/50

 2500/500

Reconstruction Comments: Axial, coronal, and sagittal sliding MIP image reconstructions are also performed. Additional radial VRT images are also performed.

 

Contrast Parameters

Parameters

Contrast Type

Non ionic

Contrast Volume

80-100ml

Saline Flush

N/A

Injection Rate

5-6ml/sec

Oral Contrast

N/A

Contrast Volume

N/A

Comments: Bolus tracking is performed off the aortic arch using a 25 HU trigger setting.