how to hide/ decrease the opacity of bone to measure thickness of metatarsal bone?

how to hide/ decrease the opacity of bone to measure thickness of metatarsal bone?

Have you segmented the bones or just use volume rendering to show the bones?
Can you post a screenshot that illustrates what is your exact need?

Good afternoon sir, thanks for your reply, i want to find the internal diameter of shaft of metatarsals. So if bone becomes transparent it will be easier to calculate the morphometrics easily and correctly. Kindly help.
Please find attached screenshot for your reference.


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