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

Apex of the lungs 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: This protocol was created using the Siemens DSXXL_Chest_PainECG scan parameters, which allows for the temporal resolution to be adjusted even after the scan has been completed. Increasing the resolution times will allow for a reduction in image noise at the expense of increased cardiac motion. All scans are performed using the ALARA principle. A 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

Soft Tissue

Thin Data

Lung

Slice Thickness

 3mm

 0.75mm

 3mm

Reconstruction Spacing

 3mm

 0.5mm

 3mm

Reconstruction Algorithm

 B30f

 B26f ASA

 B80f

Window Width and Level

 410/100

 500/100

 1600/-500

Reconstruction Comments: A 1.0mm x 0.6mm 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/aorta will increase spatial resolution of the coronary vessels. Iterative reconstructions are performed to improve image noise. Coronal and sagittal image reconstructions are also performed.

 

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 230HU trigger value on the ascending aorta. A saline flush can be used to soften the SVC and limit beam hardening artifact.