Acquisition Phase

Phase Included

Scan Delay

Respiration Phase

Anatomical Coverage

Non Contrast

Yes

N/A

N/A

Base of skull through apex

Arterial Phase

 N/A

N/A

N/A

N/A

Venous Phase

 N/A

N/A

N/A

N/A

Delayed Phase

 N/A

N/A

N/A

N/A

Scan Comments: IV contrast is used when clinically indicated. All scans are performed using the ALARA Principle.

 

Technical Parameters

Parameters

kVp

120

Effective mAs

See chart

Care Dose Reference mAs

N/A

Time (Rotation)

0.33 sec

Average Acquisition Time

6-8 sec

Collimation

64 x 0.6mm

Pitch Value

0.65

Scan Direction

Craniocaudal

Comments: The effective mAs is adjusted using guidelines based upon the patient’s age.

 

Reconstruction Parameters

Soft Tissue

Thin Data

Bone

Slice Thickness

5mm

1.0mm

3mm

Reconstruction Spacing

5mm

0.8mm

3mm

Reconstruction Algorithm

C30s

C20s

B80f

Window Width and Level

100 / 30

100 / 30

 2500 / 500

Reconstruction Comments:  Coronal and sagittal reconstructions are performed. True axial MPR images are generated when patients are unable to be positioned correctly.

 

Contrast Parameters

Parameters

Contrast Type

N/A

Contrast Volume

 N/A

Saline Flush

 N/A

Injection Rate

 N/A

Oral Contrast

 N/A

Contrast Volume

 N/A

Comments: N/A

 

The effective mAs for a pediatric spiral head CT is calculated using the following chart.

Age (years)

Effective mAs

 

  75 mAs

 6 months – 3 yrs

  125 mAs

 3 – 6 yrs

  175 mAs

 >6 yrs

  200 mAs