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Item Open Access Acquisition and processing of data in a tomographic imaging apparatus(2019) Kingston A; Latham S; Sheppard A; Myers G; Recur B; Li HT; Varslot TA method of investigating a specimen using a tomographic imaging apparatus using a stage for producing relative motion of a source with respect to a specimen , so as to allow the source and a detector to image the specimen along a series of different viewing axes and a processing apparatus for assembling a tomographic image of at least part of the specimen . The investigation is carried out by considering a virtual reference surface that surrounds the specimen and is substantially centered thereon , considering an incoming point of intersection of each of said viewing axes with this reference surface , thereby generating a set of such intersec tion points corresponding to the series of viewing axes , choosing discrete viewing axes in the series so as to cause the set to comprise a two - dimensional lattice of points located areally on the reference surface in a substantially uniform distribution.Item Open Access Data processing in a tomographic imaging apparatus(2018) Kingston A; Latham S; Sheppard A; Myers G; Recur B; Li HTA method of investigating a specimen using a tomographic imaging apparatus , by performing , in multiple iterations , the following steps : ( i ) Using a Back Projection technique to produce an initial tomogram from a set of initial images ; ( ii ) Subjecting said initial tomogram to a mathematical filtering operation , thereby producing an adjusted tomogram ; ( iii ) Using a Forward Projection technique on said adjusted tomogram to dissociate it into a set of calcu lated images ; ( iv ) Repeating steps ( i ) - ( iii ) until said calculated images satisfy an acceptance criterion .