Surface fraction calculates the fraction of bone volume in an image by comparing meshes created from bone particles and the whole image. A mesh is a collection of triangular faces that defines the shape of an object in 3D graphics. The plug-in assumes that all foreground voxels represent bone.
Areas of bone that project above the bone surface can be globally referred to as projections. They are attachment points for tendons and ligaments, with their shape and size being indicative of the force exerted through the attachment to the bone. Below, we explore the different types of bony projections within this category.
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