This type of bone is not white, but is a grayish color on a CT scan image. The spongy bone, which is less dense and contains fatty bone marrow, can be seen in the center of the iliac bones and sacrum on this image. The white color indicates that it is very dense. In the CT scan image shown in Figure 1, the hard, dense cortical bone is seen as a bright white outer surface of these pelvic bones. Take this CT scan of the pelvis, for example. On a CT scan you can see these two different types of bone. The inner core of most bones contains fatty bone marrow, and is made of much softer bone that is less dense, called spongy bone. This tough outer part of the bone is very hard and is what gives bones their strength. Most bones have a very hard, very dense outer layer comprised of cortical bone. Bones are not solid, even though they may appear to be so. Before we dive in, let's take a moment to discuss what the medullary cavity of a bone is and why it's a problem if you're trying to 3D print bone models made from a CT scan.
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