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Figure 3. Reconstruction of axial images from projection data. Projection data are never viewed directly. Rather, they are used to generate axial images. In multi–detector row CT, images used for primary axial interpretation usually have a section thickness several times larger than the minimum thickness available and may be called "thick sections." However, axial images can also be generated with a smaller section thickness, as determined by the section collimation. These are usually called "thin sections" and are essential for creating multiplanar reformatted and 3D images.
