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A method of reconstructing an object from a series of radiation shadows

The method of finding the structure of an object by analysis of its X-ray projections obtained at different angular orientations has found a number of applications in medical physics. A piece of equipment is now commercially available which employs this technique for contrasting different areas on transverse slices through the head. Another application, which has importance in radiation therapy treatment planning, involves the finding of density information on a section through the body. This paper deals with a particular algorithm for reconstructing objects and includes an evaluation of this algorithm in terms of its faithfulness of reproduction for a number of simple objects. The problem of signal noise is discussed and a comparison of the algorithm with other methods of reconstruction is made.