CTA RUNOFF
(last updated 04/14/2025 last reviewed 01/15/2026)
INDICATION: Claudication.
SERIES
- 3mm Axial CTA above knee
- 2mm Axial CTA below knee
- **2nd run (if necessary – have a low threshold for repeat) mid thighs -> feet if CT scanner outruns contrast bolus
- 3mm Coronal
- 3mm Sagittal
- 3D Volume Rendered and MIPS
TECHNICAL PARAMETERS – ARTERIAL (CTA)
POSITIONING/MODE: supine / helical
SINGLE COLLIMATION WIDTH: 0.625 mm
SLICE THICKNESS: 3 mm / 2 mm
KERNAL: std
SFOV: large
COVERAGE: diaphragm -> below ankle
ACQUISITION: craniocaudal
ORAL CONTRAST: no
IV CONTRAST: 75 to 125 mL Isovue 370
INJECTION RATE: 4 mL/sec
SCAN DELAY: Care bolus mid abdominal aorta (100HU) ~20 to 30 sec
RESPIRATION: inspiration
POSTPROCESSING: 3 mm cor/sag CTA, volume rendered 3D
NOTES: Tape ankles together and place head cushion between ankles. Use table extender
Ensure at least 2 cm overlap above knee / below knee