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	Use dose reduction software
Care Dose Reference mAs	170
Time (Rotation)	0.28 sec
Average Acquisition Time	1-2 sec
Collimation	128 x 0.6mm
Pitch Value	2.2
Scan Direction	Craniocaudal
Comments: Dose reduction software 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	2 mm
Reconstruction Spacing	3 mm	0.5 mm	3 mm	2 mm
Reconstruction Algorithm	B30f	B20f	B80f	B30f
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.

Reconstruction Parameters	Sagittal
Slice Thickness	2 mm
Reconstruction Spacing	2 mm
Reconstruction Algorithm	B30f
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.