CTA ENDOGRAFT/EVAR
(last updated 9/30/2021 last reviewed 02/10/2022)
(last updated 9/30/2021 last reviewed 02/10/2022)
INDICATION: Evaluate aortic endograft, endoleak.
SERIES
- 3mm Axial precontrast, delayed
- 1mm Axial CTA
- 3mm Coronal CTA and delayed
- 3mm Sagittal CTA and delayed
- 3D volume rendered, 3D MIPs CTA
Coverage depends on position of EVAR (abdominal, thoracic) and exam ordered (CTA A/P, CTA C/A/P, CTA C/A)
| | PRECONTRAST | CTA | DELAYED |
|
POSITION/MODE
|
supine/helical |
supine/helical |
supine/helical |
|
kV/mA/table speed
|
120kV/AutomA(200mA) 0.5 sec |
120kV/AutomA(200mA) 0.5 sec |
120kV/AutomA(200mA)
0.5 sec |
|
DETECTOR COLL
|
16 x 1.5mm (S16) 24 x 1.2mm (D64) |
16 x 1.5mm (S16) 24 x 1.2mm (D64) |
16 x 1.5mm (S16) 24 x 1.2mm (D64) |
|
SLICE THICKN
|
3mm |
1mm |
3mm |
|
PITCH
|
1 to 1.5 |
1 to 1.5 |
1 to 1.5 |
|
TABLE FEED
|
4.8 cm/sec (S16) 5.8 cm/sec D64) |
4.8 cm/sec (S16) 5.8 cm/sec D64) |
4.8 cm/sec (S16) 5.8 cm/sec D64) |
|
KERNAL
|
std |
std |
std |
|
SFOV
|
large |
large |
large |
|
COVERAGE
|
diaphragm -> CFA bif thoracic inlet -> CFA bif thoracic inlet -> Ao bif (depends on position of EVAR and exam ordered) |
diaphragm -> CFA bif thoracic inlet -> CFA bif thoracic inlet -> Ao bif (depends on position of EVAR and exam ordered) |
diaphragm -> CFA bif thoracic inlet -> CFA bif thoracic inlet -> Ao bif (depends on position of EVAR and exam ordered) |
|
ACQUISITION
|
craniocaudal |
craniocaudal |
craniocaudal |
|
ORAL CONTRAST
|
none |
none |
none |
|
IV CONTRAST
|
none |
100 mL Isovue 370 40 mL saline |
--- |
|
INJECTION RATE
|
--- |
4 mL/sec |
--- |
|
SCAN DELAY
|
--- |
Care bolus Aorta @ diaphragm (100 HU or visual) ~30 sec |
2 min |
|
RESPIRATION
|
Inspiration |
Inspiration |
Inspiration |
|
POSTPROCESSING
|
--- |
3mm Cor and Sag Vol Rendered 3D MIPS |
3mm Cor and Sag |