1. A radiographic imaging system, comprising: an imaging system having plural radiographic sources and an array of radiographic detection areas, wherein i) different sets of the radiographic detection areas sense radiation transmitted by different ones of the radiographic sources, ii) each relationship between a given one of the radiographic sources and a given one of the radiographic detection areas that senses its radiation corresponds to a relationship between a radiographic source and radiographic detection area in a multiple scan pass, single source imaging system model, and iii) relationships between the sets of radiographic detection areas correspond to translations of the radiographic detection areas in the single source imaging system model; an image acquisition system to operate the imaging system as a specimen to be imaged moves relative to the imaging system in a plurality of scan passes; and a motion control system to vary relative positions of the imaging system and specimen to thereby provide the plurality of scan passes, wherein at least some of the scan passes cause radiation from at least two of the radiographic sources to be i) transmitted through a specimen region of interest, and ii) detected by radiographic detection areas belonging to at least two corresponding sets of radiographic detection areas.