Celiac artery velocities still high( >300) despite stent placement) but stent appears patent on us. is that normal? should catheter angiogram be done?

Normal: Different studies using duplex sonodoppler testing have shown that the flow of blood in the stent gives usually a higher frequency than that in the native artery ,. the number you presented seems slightly higher than other studies have shown and a discussion with the vascular surgeon or sonography specialist is a prudent step to take .