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

 Patient dependent

Inspiration

Abdomen to include the specific region of interest

Delayed Phase

  N/A

   N/A

N/A

  N/A

Scan Comments: All scans are performed using the ALARA Principle.

 

Technical Parameters

Parameters

kVp

120

Effective mAs

See chart

Care Dose Reference mAs

See chart

Time (Rotation)

0.33 sec

Average Acquisition Time

4-5 sec

Collimation

64 x 0.6mm

Pitch Value

2.5-3.0

Scan Direction

Craniocaudal

Comments: The effective mAs is adjusted using guidelines based upon the patient's body habitus, weight, and age.

 

Reconstruction Parameters

Soft Tissue

Thin Data

Lung

Slice Thickness

3mm

1.5mm

3mm

Reconstruction Spacing

3mm

1.0mm

3mm

Reconstruction Algorithm

B30f

B20f

B80f

Window Width and Level

410 / 10

410 / 10

 1600 / -500

Reconstruction Comments:  Coronal and sagittal reconstructions are performed.

 

Contrast Parameters

Parameters

Contrast Type

Non ionic

Contrast Volume

 weight based

Saline Flush

 N/A

Injection Rate

 1.5-3ml / sec

Oral Contrast

 Non ionic

Contrast Volume

 weight based

Comments: The scan delay is determined both in part by patient age, IV access, and injection rate.

 

Other Comments: IV contrast is given when indicated to patients based upon their weight. The ratio of 1ml/lb is used up to 120ml. Images should be acquired during peak portal venous enhancement, which will vary based upon patient age, weight, and IV access. Oral contrast is mixed using 10ml of Omnipaque 350 mixed into 500ml of any non carbonated beverage. The amount of oral contrast is determined by the patient's weight:

Weight (kg)

Contrast

1-7 kg

40-60 ml

8-11 kg

110-160 ml

12-15 kg

165-240 ml

16-42 kg

250-360 ml

Over 42 kg

480 ml+

 

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

Weight (kg)

Effective mAs

 CareDose

 <15

 45-65 mAs

 

 15-24

 70-85 mAs

 

 25-34

 85-95 mAs

 

 35-44

 100-110 mAs

 

45<

CareDose

125 ref mAs