The variable block ART algorithmic scheme allows the processing of groups of equations (i.e., blocks) which need not be fixed but may rather vary dynamically throughout iterations. The number of blocks, their sizes and the assignment of equations to blocks may all vary, provided that the weights attached to the equations do not fade out in a certain technical sense. Besides encompassing row-action ART, Block-ART and Cimmino-type SIRT, the variable block ART scheme opens new, and as yet unexplored, vistas in algebraic image reconstruction techniques.
|Title of host publication||Mathematical Methods in Tomography|
|Editors||Gabor T. Herman, Alfred K. Louis, Frank Natterer|
|Place of Publication||Berlin|
|Number of pages||8|
|State||Published - 1991|
|Name||Lecture Notes in Mathematics|