This creates a plane which we can add the image above as reference.
这会创建一个平面，来添加我们刚才保存的图像。
2
A processor module maps the referenceplane into a 3d ultrasound data set and automatically calculates image planes based on the referenceplane for a current view position and a prior view position.
Analyzing the relationship between the feature of reference-image correlation plane and matching capability, a synthetic rule is established to evaluate different feature.