[ITK-users] How to get skeleton of 3D image

[沧海一粟]

I have a 3D image of tubular object. To calculate the length of the tubular object, I want to get the skeleton of it firstly. I know that BinaryThinningImageFilter can computes one-pixel-wide edges of  a 2D image. But I don't know whether is there any filter can compute one-pixel-wide edges of 3D image ? If not, how can I get the skeleton of 3D image ?
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