Fig. 18
From: The role of ultrasound imaging in vascular compression syndromes
Transverse sub-xiphoid Ultrasonographic scan. a Color Doppler US performed in inspiratory apnea that shows a regular diameter of the CA (short arrow). Epatic artery (long arrow). Splenic artery (head of arrow). b Color Doppler US performed in expiratory apnea that shows severe stenosis at the origin of the CA with aliasing due to turbulent flow and high-speed peak. c Duplex Doppler US of the CA performed in inspiratory apnea that shows a slight increase in peak speed. d Duplex Doppler of the CA performed in expiratory apnea that shows very high peak speeds (> 200 cm/s) due to severe stenosis