Functions of the stomach are storage, mixing and emptying of gastric contents. Among these functions, we focus on the gastric mixing. The stomach shows an antral contraction wave (ACW) that propagates from the proximal antrum to the pylorus. Previous studies using high-resolution concurrent manometry and magnetic resonance imaging (MRI) have suggested that the ACW plays an important role in the gastric mixing. However it is difficult to observe in vivo intragastric fluid motion in detail.

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