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

Lung apices through the diaphragm to include the adrenal glands

Venous Phase

N/A

N/A

N/A

N/A

Delayed Phase

N/A

N/A

N/A

N/A

Scan Comments: A flash spiral mode is useful when aortic root pathology is a concern to eliminate cardiac motion. Additionally, a flash spiral mode can be used to improve scan speed and limit breathing artifact if the patient is short of breath or a limited volume of contrast is needed. All scans are performed using ALARA principle. 3D post-processing is performed with this protocol.

 

Technical Parameters

Parameters

kVp

Care kV (ref. kV 120)

Effective mAs

CareDose

Quality Reference mAs

150

Time (Rotation)

0.28 sec.

Average Acquisition Time

1-2 sec.

Collimation

128 x 0.6 mm

Pitch Value

2.5

Scan Direction

Craniocaudal

Comments: CareDose is used to reduce patient dose. 100 kVp can be used for most average size patients which will significantly reduce patient dose.

 

Reconstruction Parameters

Soft Tissue

Thin Data

Lung

Coronal

Slice Thickness

 3 mm

0.75 mm

3 mm

3 mm

Reconstruction Spacing

 3 mm

0.5 mm

3 mm

3 mm

Reconstruction Algorithm

Bv40 (3)

Bv38 (3)

Bl57 (3)

Bv40 (3)

Window Width and Level

410/10

410/10

1600/-500

410/10

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. A bone window with a sharp kernel (Br59) may be helpful when evaluating for fractures.

 

Reconstruction Parameters

Sagittal

Slice Thickness

 3 mm

Reconstruction Spacing

 3 mm

Reconstruction Algorithm

Bv40 (3)

Window Width and Level

410/10

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.

 

Contrast Parameters

Parameters

Contrast Type

Non-ionic

Contrast Volume

80-120 mL

Saline Flush

N/A

Injection Rate

5-6 mL/sec.

Oral Contrast

N/A

Contrast Volume

N/A

Comments: Bolus tracking is performed off the ascending aorta using a 250 HU trigger setting.