CH‐EUS
In CH‐EUS, two phases were defined of the pancreas: an early and/or arterial phase (starting from 10 to 30 s) and a late and/or venous phase (from 30 to 90 s). Timing started immediately when the contrast media (sulfur hexafluoride) was injected through left superficial wrist vein slowly. CH mode was selected and the CH‐EUS Doppler image was observed and recorded for 60–90 s.