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 through pubic symphysis

Delayed Phase

N/A

N/A

N/A

N/A

Scan Comments: The specific acquisition phase, scan 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

Care kV (ref. kV 120)

Effective mAs

CareDose

Care Dose Reference mAs

150

Time (Rotation)

0.25 sec

Average Acquisition Time

1-2 sec.

Collimation

192 x 0.6mm

Pitch Value

2.5

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

 3mm

 3mm

Reconstruction Spacing

 3mm

 3mm

 3mm

Reconstruction Algorithm

Bv40

Bv40

 BI57

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 35cm. 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

80-120 mL

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