Transportable x-ray CT systems for Cultural Heritage diagnostics: Development, operation and case studies.

X-ray Computed Tomography (CT) is a pivotal non-destructive technique in Cultural Heritage diagnostics, offering 3D insights into object structures. Our X-ray imaging group has developed two compact and transportable systems for on-site and laboratory analysis of artworks and archaeological artifacts, at different resolutions. Both systems feature a VARIAN PS2520D flat panel detector, with a pixel size of 127 μm ensuring high-resolution imaging. The first, employing a KEVEX PXS10 microfocus X-ray tube, excels in medium-size object analysis, providing a voxel size of 50-100 μm. Conversely, the second system, featuring a YXLON SMART EVO 200D 1 mm focal spot X-ray tube, is intended for large-size objects with a typical resolution of 200-300 μm. These systems have been instrumental in the investigation of a wide range of objects different in nature, shape and size, showcasing their versatility and efficacy in Cultural Heritage preservation and restoration endeavours. In this study, we provide details about the development of these CT devices, outlining their functionality, technical specifications, and demonstrating their application through real case studies with specific examples.