“…This Special Issue received submissions focused on the most diverse research areas and coming from several different countries—from Europe to the US and Australia. After a rigorous review process, 23 manuscripts were selected—19 research articles and 4 review papers—illustrating the applications of X-ray digital radiography and computed tomography in many sectors, from medical imaging [ 1 , 2 , 3 ] to the investigation of cultural heritage objects [ 4 , 5 , 6 ], combining X-ray and neutron imaging [ 7 ].…”