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

60 sec

Inspiration

Abdomen to include dome of liver through pubic symphysis

Delayed Phase

N/A

N/A

N/A

N/A

Scan Comments: The specific scan phase, range, and delay time will be dependent on the region of interest and pathology in question. This protocol is specifically used when fast scan times are needed to limit patient motion (involuntary, cardiac, or breathing). All scans are performed using the ALARA principle.

 

Technical Parameters

Parameters

kVp

120

Effective mAs

CareDose

Care Dose Reference mAs

200

Time (Rotation)

0.28 sec

Average Acquisition Time

2 sec

Collimation

128 x 0.6mm

Pitch Value

2.0

Scan Direction

Craniocaudal

Comments: CareDose is used to reduce patient dose. We prefer to keep the pitch lower (less than 2.5) when scanning through the abdomen. This will avoid increased image noise or spiral artifact while still minimizing both cardiac and breathing motion.

 

Reconstruction Parameters

Soft Tissue

Thin Data

Lung

Slice Thickness

 3mm

 0.75mm

 3mm

Reconstruction Spacing

 3mm

 0.5mm

 3mm

Reconstruction Algorithm

 B30f

 B20f

 B80f

Window Width and Level

 410/10

410/10

 1600/-500

Reconstruction Comments: When using Flash spiral mode, the DFOV is limited by the smaller of the two detector arrays to 33.2cm. This limitation can be overcome by reducing the pitch value to allow for a greater DFOV. Coronal and sagittal image reconstructions are also performed.

 

Contrast Parameters

Parameters

Contrast Type

 Non ionic

Contrast Volume

 80-120ml

Saline Flush

 N/A

Injection Rate

 Depends on region of interest and pathology

Oral Contrast

 Depends on region of interest and pathology

Contrast Volume

 Depends on region of interest and pathology

Comments: N/A