Adaptix Limited

Vadim Soloviev

Digital Tomosynthesis (DT) is a type of limited angle tomography providing the benefits of 3D imaging. Much like Computerized Tomography (CT), DT allows greater detection of 3D structures by viewing one slice at a time. In contrast to CT, the DT projection dataset is incomplete, which violates the tomographic sufficiency conditions and results in limited angle artefacts in the reconstructed images. The present invention provides a method of producing a tomogram in which reconstruction is performed along lines on the x-ray detector paneldefined by a point on the detector panelclosest to a point location of the x-ray emitter, to a location of a respective pixel on the perimeter of the x-ray detector panel. In this way, artefact reduction is achieved, particularly at higher cone beam angles, and at lower stand-off distances.

X-ray tomography system and method

The majority of image reconstruction algorithms are common to DT and CT, and require reconstruction volume allocation and are based on ray tracing techniques. Reconstructed three-dimensional images become available only after the entire volume is processed and the algorithm completes. The present invention performs reconstruction on a slice-by-slice basis, instead of waiting for completion of the algorithm by back-projecting each pixel in each attenuation image towards the emitter that generated that image, onto a selected reconstruction slice and determining a proportion of overlap with grid cells in the slice to obtain weighting factors in order to calculate an average back-projected intensity for each grid cell in the selected reconstruction slice.

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Begbroke, United Kingdom

Vadim Soloviev