Coronary CTA

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

Carina through the apex of the heart

Venous Phase

N/A

N/A

N/A

N/A

Delayed Phase

N/A

N/A

N/A

N/A

Scan Comments: All scans are performed using the ALARA principle. 3D post-processing is performed with this protocol.

 

Technical Parameters

Parameters

kVp

120

Effective mAs

CareDose

Quality 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: CareDose is used to reduce patient dose. Both the pitch and the scan time will vary based upon the patient's heart rate.

 

Reconstruction Parameters

Best Diastolic

Best Systolic

Multiphase 0-100%

Thin Data 20%

Slice Thickness

0.75 mm

0.75 mm

1 mm

0.75 mm

Reconstruction Spacing

0.5 mm

0.5 mm

 0.8 mm

0.5 mm

Reconstruction Algorithm

B26f ASA

B26f ASA

B26f ASA

B26f ASA

Window Width and Level

500/100

500/100

500/100

500/100

Reconstruction Comments: Images are reconstructed in both best systolic and best diastolic phases. Additional images are reconstructed at 20% and 70% of the R-R interval. A 1.0 mm x 0.8 mm multiphase reconstruction is generated across the entire ECG pulsing range (0-100%).

 

Reconstruction Parameters

Thin Data 70%

Slice Thickness

0.75 mm

Reconstruction Spacing

0.5 mm

Reconstruction Algorithm

B26f ASA

Window Width and Level

500/100

Reconstruction Comments: Images are reconstructed in both best systolic and best diastolic phases. Additional images are reconstructed at 20% and 70% of the R-R interval. A 1.0 mm x 0.8 mm multiphase reconstruction is generated across the entire ECG pulsing range (0-100%).

 

Flash Aorta

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 entire aortic vasculature to include proximal femoral artery

Venous Phase

N/A

N/A

N/A

N/A

Delayed Phase

N/A

N/A

N/A

N/A

Scan Comments: All scans are performed using the ALARA principle. 3D post-processing is performed with this protocol.

 

Technical Parameters

Parameters

kVp

120

Effective mAs

200

Quality Reference mAs

N/A

Time (Rotation)

0.28 sec

Average Acquisition Time

2-3 sec

Collimation

128 x 0.6mm

Pitch Value

2.1

Scan Direction

Craniocaudal

Comments:We prefer to keep the pitch lower (less than 2.5) when scanning through the abdomen. This will avoid increased image noise or spiral artifact while still minimizing both cardiac and breathing motion.

 

Reconstruction Parameters

Soft Tissue

Thin Data

Thin Data

Lung

Slice Thickness

 3 mm

0.75 mm

 0.75 mm

3 mm

Reconstruction Spacing

 3 mm

0.5 mm

 0.5 mm

3 mm

Reconstruction Algorithm

B30f

B20f

I41f (3)

B80f

Window Width and Level

410/10

410/10

410/10

1600/-500

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 a greater DFOV.

 

Reconstruction Parameters

Coronal

Sagittal

Slice Thickness

 3 mm

3 mm

Reconstruction Spacing

 3 mm

3 mm

Reconstruction Algorithm

B30f

B30f

Window Width and Level

410/10

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 a greater DFOV.CT

 

Contrast Parameters

Parameters

Contrast Type

Non-ionic

Contrast Volume

120 mL

Saline Flush

40 mL

Injection Rate

4-5 mL/sec

Oral Contrast

H2O

Contrast Volume

1000 mL

Comments: Bolus tracking is performed off the ascending aorta.