Methods:First,the o point which was the projection parallelogram center of steel wires,, and was sought according to the principle of parallelogram,then the height midpoint of steel wires and was found.
Methods:First,the o point which was the projection parallelogram center of steel wires,, and was sought according to the principle of parallelogram,then the height midpoint of steel wires and was found.
方法:根据平行四边形原理,首先找到切线野上、下、左、右边界即钢丝、、 、在水平面上的投影平行四边形中心O点,然后再寻找过O点患者横断面垂直高度钢丝和中心。