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

Venous Phase

N/A

N/A

N/A

N/A

Delayed Phase

N/A

N/A

N/A

N/A

Scan Comments: For larger patients, it is helpful to utilize a DSXXL based scan protocol that allows for the temporal resolution to be adjusted even after the scan has been completed. Increasing the temporal resolution times will allow for a reduction in image noise at the expense of the increased cardiac motion. All scans are performed using the ALARA principle. 3D post-processing is performed with this protocol.

 

Technical Parameters

Parameters

kVp

120

Effective mAs

CareDose

Care Dose Reference mAs

320

Time (Rotation)

0.28 sec

Average Acquisition Time

HR Dependent

Collimation

128 x 0.6mm

Pitch Value

HR Dependent

Scan Direction

Craniocaudal

Comments: Both the pitch and the scan time will vary based upon the patient's heart rate. ECG dose modulation is always performed to limit patient exposure. CareDose is used to reduce patient dose.

 

Reconstruction Parameters

Best Phase Heart Mag

Soft Tissue Open Field

Thin Data Open Field

Lung Open Field

Slice Thickness

0.75 mm

 3mm

 0.75mm

 3mm

Reconstruction Spacing

0.5 mm

 3mm

 0.5mm

 3mm

Reconstruction Algorithm

B26f ASA

 B30f

 B20f

 B80f

Window Width and Level

500/100

 410/10

 410/10

 1600/-500

Reconstruction Comments: A 1.0 mm x 0.6 mm multiphase reconstruction is generated across the ECG pulsing range every 5-10% of the R-R interval. An additional smaller DFOV reconstruction that only includes the heart and aorta will increase spatial resolution of the coronary vessels.

 

Reconstruction Parameters

Multiphase Heart Mag

Coronal Open Field

Sagittal Open Field

Slice Thickness

1 mm

 3mm

 3mm

Reconstruction Spacing

0.6 mm

 3mm

3 mm

Reconstruction Algorithm

I41f (3)

 B30f

 B30f

Window Width and Level

500/100

 410/10

 410/10

Reconstruction Comments: A 1.0 mm x 0.6 mm multiphase reconstruction is generated across the ECG pulsing range every 5-10% of the R-R interval. An additional smaller DFOV reconstruction that only includes the heart and aorta will increase spatial resolution of the coronary vessels.

 

Contrast Parameters

Parameters

Contrast Type

Non ionic

Contrast Volume

120mL

Saline Flush

30mL

Injection Rate

5-7 mL/sec

Oral Contrast

N/A

Contrast Volume

N/A

Comments: Bolus tracking is used ideal with a 230 HU trigger value on the ascending aorta. A saline flush can be used to soften the SVC and limit beam hardening artifact.