Acquisition Phase

Phase Included

Scan Delay

Respiration Phase

Anatomical Coverage

Non Contrast

N/A

N/A

N/A

N/A

Arterial Phase

N/A

N/A

N/A

N/A

Venous Phase

Yes

50 sec

N/A

Base of skull through vertex

Delayed Phase

N/A

N/A

N/A

N/A

Scan Comments: Non-contrast images are performed when a bleed is suspected prior to CTV. Using a dual energy protocol is useful if bone removal is warranted. Iso-centering the patient within the gantry is key to image quality. All scans are performed using the ALARA principle.

Technical Parameters

Parameters

kVp

100 / 140

Effective mAs

Use dose reduction software

Care Dose Reference mAs

270 / 270

Time (Rotation)

0.33 sec

Average Acquisition Time

4-5 sec

Collimation

128 x 0.6mm

Pitch Value

0.55

Scan Direction

Caudocranial

Comments: Iso-centering the patient within the gantry is key to image quality. Dose reduction software is used to reduce patient dose.

Reconstruction Parameters

Soft Tissue

Bone

Thin Data

Hi Res

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

D30f

B70f

I26f

B50f

Window Width and Level

350/50

2500/500

700/80

700/80

Reconstruction Comments: When generating mixed images, the DE composition is set to 0.8.

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

B50f

B50f

B50f

Window Width and Level

700/80

700/80

700/80

Reconstruction Comments: When generating mixed images, the DE composition is set to 0.8.

Contrast Parameters

Parameters

Contrast Type

Non-ionic

Contrast Volume

120 mL

Saline Flush

N/A

Injection Rate

4-5 mL/sec

Oral Contrast

N/A

Contrast Volume

N/A

Comments: A fixed delay of 50 seconds is optimal.