CT Venogram C+
(last updated 01/11/2024, last reviewed 01/15/2026)
INDICATION: r/o Venous abdominal/pelvic thrombosis. Lower extremity swelling.
SERIES
- 3mm Axial
- 3mm Coronal
- 3mm Sagittal
COVERAGE:
If A/P ordered, scan ~5 cm below pubic symphysis -> diaphragm
If A/P and lower extremities ordered, scan ankles -> diaphragm
If lower extremities ordered, scan ankles -> iliac crest
If lower extremities ordered, scan ankles -> iliac crest
Use 3 minute delay for IV contrast timing of lower extremities.
Use 2 minute delay for IV contrast timing of A/P.
Use 2 minute delay for IV contrast timing of A/P.
TECHNICAL PARAMETERS
POSITIONING/MODE: supine / axial
kV/mA/rotation time: per scanner protocol, CareDose/iDose/ASIR, Care kV; <1 sec
PITCH: </=1.5
SINGLE COLLIMATION WIDTH: 0.625 mm
SLICE THICKNESS: 3 mm
KERNAL: std soft tissue
SFOV: large
COVERAGE:
Lower extremities + A/P: ankles -> diaphragm
A/P: ~5 cm below pubic symphysis -> diaphragm
Lower extremities: ankles -> iliac crest
ACQUISITION: caudocranial
IV CONTRAST: yes
INJECTION RATE: 3.5 to 4 mL/sec
SCAN DELAY: 3 min (lower extremity), 2 min (A/P)
IV CONTRAST DOSE: 75 to 100 mL
ORAL CONTRAST: no
RESPIRATION: Inspiration
POSTPROCESSING: 3 mm coronal, 3 mm sagittal