title: Block-iterative methods for image reconstruction from projections.
abstract: The simultaneous MART algorithm (SMART) and the expectation maximization method for likelihood maximization (EMML) are extended to block-iterative versions, BI-SMART and BI-EMML, that converge to a solution in the feasible case, for any choice of subsets. The BI-EMML reduces to the "ordered subset" EMML of Hudson et al. (1992, 1994) when their "subset balanced" property holds.
authors.affiliation: Dept. of Math., Massachusetts Univ., Lowell, MA.
authors.forename: C L
authors.initials: CL
authors.lastname: Byrne