an implement consisting of a broad blade or scoop attached to a long handle, used for taking up, removing, or throwing loose matter, as earth, snow, or coal. 2. any fairly large contrivance or machine with a broad blade or scoop for taking up or removing loose matter: a steam shovel. 3. a shovelful.
Cone beam computed tomography. Cone beam computed tomography. MeSH. Cone beam computed tomography (or CBCT, also referred to as C-arm CT, cone beam volume CT, or flat panel CT) is a medical imaging technique consisting of X-ray computed tomography where the X-rays are divergent, forming a cone.
The truncated cone is a lot like a lampshade. I've drawn one below with some helping lines labelled t, b, h and w : So t is the diameter of the circular top of the cone, b is the diameter of the circular bottom, h is the height of the cone and w is the diagonal width.