Of course, r goes all around the z axis, but I'm just doing a slice through one of these vertical half planes, fixing the value of theta.
当然，r可以围绕z轴转圈，但我只做了一个垂直的半平面，对于一个确定的θ来说。
If I look only at the slice parallel to the X-axis then maybe I am going through the minimum.
如果我只观察平行于x轴的切面，那这应该是一个极小值点。
The transepicondylar axis of different position has no effect on volume rendering technique measuring the humeral head retroversion angle with multi slice spiral CT.
肱骨远端不同位置内外上髁轴线对多层螺旋CT容积再现测量肱骨头扭转角没有影响；
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