Acquisition Phase

Phase Included

Scan Delay

Respiration Phase

Anatomical Coverage

Non Contrast

Yes

N/A

Inspiration

To include the iliac crest through the lesser trochanter of the femur

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: In select cases where a vascular neoplasm is suspected, IV contrast is necessary. Also, when imaging trauma patients it can be helpful to perform a CTA at the same time. All scans are performed using the ALARA principle.

 

Technical Parameters

Parameters

kVp

120

Effective mAs

CareDose

Care Dose Reference mAs

200

Time (Rotation)

0.5 sec

Average Acquisition Time

5-7 sec

Collimation

128 x 0.6mm

Pitch Value

0.8

Scan Direction

Craniocaudal

Comments: 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

 B30f

 B60f

 B70f

Window Width and Level

 410/10

1776/176

 1776/176

Reconstruction Comments: Additionally, a soft tissue thin data set is also performed using 0.75mm x 0.5mm slices with a B20f algorithm. Coronal and sagittal image reconstructions are also performed.

 

Contrast Parameters

Parameters

Contrast Type

Non ionic

Contrast Volume

120ml

Saline Flush

N/A

Injection Rate

2-3ml/sec

Oral Contrast

N/A

Contrast Volume

N/A

Comments: IV contrast is not routinely necessary, however, if warranted we use the above protocol.