Region of interest tomography of bigger than detector samples

For many neutron tomography setups, the maximum sample size for tomography is limited by a comparatively small beam cross section. However, it is not well known outside the medical field that it is possible to perform region-of-interest tomography of sections inside the object that fit into the beam and detector area. Approximately valid reconstruction data appear in a circle with a diameter of approximately the detector width, but with incomplete data and strong artifacts outside that circle. These artifacts can be removed either by mathematical means or by simple geometrical cutting of the reconstructed data, enabling the examination of samples bigger than the detector or beam area.