Acquisition Phase

Phase Included

Scan Delay

Respiration Phase

Anatomical Coverage

Non Contrast

N/A

N/A

N/A

N/A

Arterial Phase

Yes

Bolus triggered

Inspiration

diaphragm through pubic symphysis

Venous Phase

Yes

60 sec

Inspiration

diaphragm through iliac crest

Delayed Phase

Yes

5-7 min

Inspiration

kidneys through bladder

Scan Comments: Scan ranges are limited to a specific area of interest to avoid unnecessary patient dose. Dual energy post processing software can be used to eliminate the need for acquiring noncontrast images. Dual energy is used only for the arterial phase images in order to reduce the number of images generated for each study. Single energy is used for all other phases. For specific technical parameters, see the single energy kidney mass protocol.  All scans are performed using the ALARA principle. A 3D Post Processing is performed with this protocol.

 

Technical Parameters

Parameters

kVp

100/140

Effective mAs

CareDose

Care Dose Reference mAs

250/193

Time (Rotation)

0.5 sec

Average Acquisition Time

10-15 sec

Collimation

32 x 0.6mm

Pitch Value

0.8

Scan Direction

Craniocaudal

Comments: Images are acquired using 100 / 140 kVp setting with a Sn filter. CareDose 4D is used to significantly reduce patient exposure. The pitch value should remain below 1.0 to reduce any artifacts during post processing. 

 

Reconstruction Parameters

Soft Tissue

Thin Data

Lung

Slice Thickness

 3mm

 0.75mm

 3mm

Reconstruction Spacing

 3mm

 0.5mm

 3mm

Reconstruction Algorithm

 B31f

 B20f

 B80f

Window Width and Level

 410/10

410/10

 1600/-500

Reconstruction Comments: Coronal and sagittal image reconstructions are also performed.

 

Contrast Parameters

Parameters

Contrast Type

Non ionic

Contrast Volume

120ml

Saline Flush

N/A

Injection Rate

4-5ml/sec

Oral Contrast

H2O

Contrast Volume

1000ml

Comments: Bolus tracking is performed off the abdominal aorta using a 230 HU trigger setting