Coronary CTA Routine Spiral

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

Semi (ref. kV 100)

Effective mAs

CareDose

Quality Reference mAs

288

Time (Rotation)

0.25 sec

Average Acquisition Time

HR Dependent

Collimation

192 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 Systolic

Best Diastolic

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

Bv40 (2)

Bv40 (2)

Bv40 (2)

Bv40 (2)

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

Bv40 (2)

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%).

 

CTA Aorta Flash Spiral

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

Care kV (ref. kV 120)

Effective mAs

CareDose

Quality Reference mAs

150

Time (Rotation)

0.25 sec

Average Acquisition Time

1-2 sec

Collimation

192 x 0.6mm

Pitch Value

2.5

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

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

Br40 (3)

Br36 (3)

Bl57 (3)

Br40 (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 35cm. This limitation can be overcome by reducing the pitch value to allow a greater DFOV.

 

Reconstruction Parameters

Sagittal

Slice Thickness

 3 mm

Reconstruction Spacing

 3 mm

Reconstruction Algorithm

Br40 (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 35cm. This limitation can be overcome by reducing the pitch value to allow a greater DFOV.

 

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.