将两组双重造影用钡剂作体内、外对比,发现粗而不匀型钡剂优于细而均匀型钡剂。前者具有下列特点:(1)大而不规则的钡粒易于沉积在胃小沟内,使X线片上胃小区和胃小沟显示得更加清晰。(2)电泳速率高,故不易絮凝。(3)粘度明显低于含同样附加成分的细而均匀型钡剂,因此当其浓度高达250％(W/V)时,其流动性仍佳。 The two sets of double contrast tinctures were compared in vivo and in vitro, and it was found that thick and uneven tinctures were superior to fine and uniform tinctures. The former has the following characteristics: (1) large and irregular pods are easy to deposit in the gastric minor sulcus, so that the X-ray film on the stomach area and the gastric minor groove are displayed more clearly. (2) The electrophoresis rate is high, so it is not easy to flocculate. (3) Viscosity is significantly lower than that of fine and uniform tanning agents containing the same additional components, so when the concentration is as high as 250% (W/V), the fluidity is still good.