Abstract
Radiograms which retain three-dimensional information about an object can be recorded using coded apertures. Recovering this information as slice images necessitates a decoding step. We describe here an improved lensmatrix decoding method. For this method the coded radiogram is (incoherently) imaged simultaneously by several compound imaging elements composed of lens-kinoform pairs. The lenses provide shifting and focusing for the decoding, while the kinoforms provide spatial filtering to suppress images of undesired slices.