Definitions for "Back projection"
Mathematical procedure for the reconstruction of the CT image, based on the smearing of the individual rays within a view (projection) back along the direction in which they were measured. Spatial filtration ( convolution) of the raw data is necessary before back projection in order to reduce artefacts.
A technique of reconstructing images from projections taken of an object at interval angles.
Projectors built into the set and set up behind the screen, together with sound and lighting controls etc. Back projection usually provides a brighter screen image because the projectors are closer to the screen. Requires at least 3 metres extra space in the room.