Emerging developments in tomographic imaging with hard X-rays

This year, we celebrate the 125th anniversary of medical imaging based on RONTGEN's discovery. Human hands with a metallic ring have been replicated numerous times. The early radiographs show impressive details on the bony structure. Thanks to tomographic imaging, the advanced X-ray instrumentation, the sophisticated algorithms of reconstruction and data evaluation as well as the preparation beyond the well-established staining we can make visible the micro- and nanostructures of the bone with its surrounding tissues with unequalled details, just to mention one example. This paper summarizes selected key aspects of the contributions in the 13th volume on Developments in X-ray Tomography, which have emerged over the last two years.