Radiographic imaging and tomography (RadIT) come in many types such as x-ray imaging and tomography (IT), proton IT, neutron IT, muon IT, and more. We identify five RadIT themes: physics, sources, detectors, methods, and data science, which are integral parts of image interpretation and 3D tomographic reconstruction. Traditionally, RadIT has been driven by medicine, non-destructive testing, material sciences, and security applications. The latest thrusts of growth come from automation, machine vision, additive manufacturing, and virtual reality (the "metaverse"). The five RadIT themes parallel their counterparts in optical IT. Synergies among different forms of RadIT and with optical IT motivate further advances towards multi-modal IT and quantum IT.
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