fdk(1) on Linux
The text 2bc5cf63c1c6, as Debian 8 (Jessie) shipped it.
cone-beam reconstruction from projections using the FDK algorithm The term FDK refers to the authors Feldkamp, Davis, and Kress who wrote the seminal paper "Practical cone-beam algorithm" in 1984. Their paper describes a filtered back-projection reconstruction algorithm for cone-beam geometries. The fdk program in plastimatch is an implmenetation of the FDK algorithm.