使用自动边界检测对所述容积对象的对应边界进行描记。
Corresponding borders of the volumetric object are traced using automatic border detection.
在胃排空、胃收缩或胃蠕动时，由于胃的形态、容积及其内容物组成情况的改变较大，电特性变化非常明显，变化规律与胃动力学状况相对应，相关性强。
During the digest course the electrical property of the stomach alters obviously due to the change in shape, dimension, volume of gastric and the composition of stomach.
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