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

Bass of skull through vertex

Delayed Phase

N/A

N/A

N/A

N/A

Scan Comments: Noncontrast images are performed when a bleed is suspected prior to CTV. Using a Dual energy protocol is useful if bone removal is warranted. All scans are performed using the ALARA principle.

 

Technical Parameters

Parameters

kVp

100 / 140

Effective mAs

CareDose

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: Isocentering the patient within the gantry is key to image quality. CareDose is used to reduce patient dose.

 

Reconstruction Parameters

Soft Tissue

Thin Data

Bone

Slice Thickness

 3mm

 0.75mm

 3mm

Reconstruction Spacing

 3mm

 0.5mm

 3mm

Reconstruction Algorithm

 D30f

 I26f / B50f

 B70f

Window Width and Level

 350/50

 700/80

 2500/500

Reconstruction Comments: Coronal and sagittal image reconstructions are performed. Additional radial MIP and sliding MIP images are also performed.

 

Contrast Parameters

Parameters

Contrast Type

Non ionic

Contrast Volume

120ml

Saline Flush

N/A

Injection Rate

3-4ml/sec

Oral Contrast

N/A

Contrast Volume

N/A

Comments: A fix delay of 50 seconds is optimal.