CTA RUNOFF (last updated 06/19/13, last reviewed 5/29/2018)
INDICATION: Claudication.
SERIES
- 3mm Axial CTA above knee
- 2mm Axial CTA below knee
- 3mm Coronal
- 3mm Sagittal
- 3D Volume Rendered and MIPS
| | |
|
POSITIONING/MODE
|
supine/helical |
|
kV/mA/rot time
|
120kV/auto mA/0.5 sec |
|
DETECTOR COLLIMATION
|
16 x 1.5mm (S16) 24 x 1.2mm (D64) |
|
SLICE THICKNESS
|
3mm above knee 2mm below knee |
|
PITCH
|
1 to 1.5 |
|
TABLE FEED
|
4.8 cm/sec (S16) 5.8 cm/sec (D64) |
|
KERNAL
|
std |
|
SFOV
|
large |
|
COVERAGE
|
diaphragm -> below ankle ensure at least 2cm overlap above knee/below knee |
|
ACQUISITION
|
craniocaudal |
|
ORAL CONTRAST
|
none |
|
IV CONTRAST
|
125 mL Isovue 370, then 40 mL saline |
|
INJECTION RATE
|
4 mL/ sec |
|
SCAN DELAY
|
Care bolus mid abdominal aorta (100 HU) ~20 to 30 sec |
|
RESPIRATION
|
Inspiration |
|
POSTPROCESSING
|
3mm Coronal and Sagittal (aorta/iliacs) 3D VR and MIPS (aorta/iliacs, upper legs, lower legs) |
NOTES: Tape ankles together and place head cushion between ankles. Use table extender
