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

Care kV (ref. kV 120)

Effective mAs

CareDose

Quality Reference mAs

84

Time (Rotation)

0.28 sec.

Average Acquisition Time

8-10 sec.

Collimation

128 x 0.6 mm

Pitch Value

1.2

Scan Direction

Caudocranial

Comments: CareDose 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 Carotid 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

Br40 (3)

Br62 (3)

Br51 (3)

Br36 (3)

Window Width and Level

350/50

2500/500

700/80

350/50

Reconstruction Comments: Additional radial VRT images are also performed.

 

Reconstruction Parameters

Sliding MIP Axial

Sliding MIP Coronal

Sliding MIP Sagittal

Slice Thickness

16 mm

16 mm

16 mm

Reconstruction Spacing

 3 mm

3 mm

3 mm

Reconstruction Algorithm

Br51 (3)

Br51 (3)

Br51 (3)

Window Width and Level

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.