Figure 5.

In some cases there is no single threshold value that will correctly select the surface of interest because of partial volume effects. (A) In this example the specimen (Tapirus pinchaque: MVZ 124091) has regions of thin and thick bone. (B). Use of the half‐maximum thresholding protocol will correctly define the surface location in regions of thick bone but not in regions where the bone is too thin to reach the true CT value for bone. (C) Accordingly, the threshold will drop out surfaces defined by thin bone.