VTK raycasting aliasing lines

Tried to generate raycasting for a knee CT, but the resulting image shows some aliasing lines, as shown in the image. Anyone can help me out? Thanks!

This already looks very nice, but if you think it is necessary then you can enable jittering or set smaller SampleDistance and/or ImageSampleDistance manually.

Really appreciate your help!!!
After apply .SetUseJittering the image get much better.

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