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

Use dose reduction software

Quality Reference mAs

300

Time (Rotation)

0.33 sec

Average Acquisition Time

8-10 sec

Collimation

128 x 0.6mm

Pitch Value

0.35

Scan Direction

Caudocranial

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

Reconstruction Parameters

Soft Tissue

Bone

Hi Res Brain Only

Thin Data COW Mag

Slice Thickness

 3 mm

3 mm

 0.75 mm

0.75 mm

Reconstruction Spacing

 3 mm

3 mm

 0.5 mm

0.5 mm

Reconstruction Algorithm

B30f

B60f

B50f

B20f

Window Width and Level

350/50

2500/500

700/80

350/50

Reconstruction Comments: Additional radial VRT images are also performed.

Reconstruction Parameters

Thin Data Carotid Mag

Sliding MIP Axial

Sliding MIP Coronal

Sliding MIP Sagittal

Slice Thickness

0.75 mm

16 mm

16 mm

16 mm

Reconstruction Spacing

0.5 mm

3 mm

3 mm

3 mm

Reconstruction Algorithm

B20f

H50f

H50f

H50f

Window Width and Level

350/50

700/80

700/80

700/80

Reconstruction Comments: Additional radial VRT images are also performed.

Contrast Parameters

Parameters

Contrast Type

Non-ionic

Contrast Volume

80-100 mL

Saline Flush

N/A

Injection Rate

5-6 mL/sec

Oral Contrast

N/A

Contrast Volume

N/A

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