I am new to slicer. I tried segmenting small bones from 3D DICOM images and the 3 d image quality is not very clear as shown in videos. Like bone surface are not smooth ( if I make it smooth by surface tools module, I lose surface details, don’t I?). Trying to recreate good surface details. Could an…

Could you paste here a few screenshots to illustrate what kind of input images you have and how the segmented output looks like?

This is as opposed to the following image unsegmented but built from the same CT scan usi g a dicom viewer. Surface! anatomy is clearer and surfaces are smooth [image]

The two visualizations are very different. What you segmented is a surface rendering of a surface model created from a labelmap of the segmentation. The image you pasted from the DICOM viewer is a volume rendering, which is a visualization technique directly from the volume. Read a bit on this here: …

Thank you very much @cpinter . Does this mean segmenting a small bone of about 15 mm diameter and trying to identify a 1mm sized vascular foramen on the surface is not very accurate, after segmentation.

If you need small details, and you are able to do a very accurate segmentation, then you could increase the resolution of the segmentation. There is a small box-like icon next to the master volume selector in Segment Editor. If you click it (before segmentation), select your image, then increase the…

Hi, It depends on the resolution of your CT data relative to the size of the structure that you want to see. Lets say you have data with 1mm resolution in all directions, then your 1mm vascular opening is just one voxel. Best Ron

Thank you ever so much @cpinter . This DOES help a lot

Thank you very much. Will try this. Thanks a lot again.

Thank you very much Ron Melanie

Surface details in segmenting

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lassoan (Andras Lasso) September 20, 2018, 2:51pm 9

This picture shows how to oversample the segmentation by a factor of 2:

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Editing of planar contours without converting to binary label map

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Surface details in segmenting

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