These are individual emitters operated in multiple groups where each illuminates a region of interest between the emitter array and the detector array, so that the cone of radiation beams projected onto the detector array from any emitter single in any group is substantially spatially separated from the corresponding projected cones from all other emitters in the same group. at least the 3d portion of the space between the emitting panel and the detector panel is represented by volume elements 3d (voxels), wherein at least some voxels represent respective portions of such space that are crossed by corresponding portions of a plurality of radiation rays, each of which extends from a respective emitter to a respective detector and are associated with respective absorption coefficients representative of the radiation absorption characteristic of a corresponding portion of roi. The image reconstruction process is an iterative process in which neighboring voxels that have similar calculated coefficients are combined into larger voxels, where neighboring voxels that have different calculated coefficients are divided into smaller voxels, and new absorption coefficients are calculated.trata-se de emissores individuais operados em múltiplos grupos em que cada um ilumina uma região de interesse entre o arranjo de emissor e o arranjo de detector, de modo que o cone de raios de radiação projetados sobre o arranjo de detector a partir de qualquer emissor único em qualquer grupo seja substancialmente separado de modo espacial dos cones projetados correspondentes a partir de todos os outros emissores no mesmo grupo. pelo menos a porção de roi do espaço 3d entre o painel emissor e o painel detector é representada por elementos de volume 3d (voxels), em que pelo menos alguns voxels representam porções respectivas de tal espaço que são cruzadas por porções correspondentes de uma pluralidade de raios de radiação, em que cada uma se estende a partir um respectivo emissor a um respectiv
