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；
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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