Automated PCB X-ray inspection is an important quality control technology using either 2D or 3D X-ray imaging to detect defects in products during the production process. AXI complements automated optical inspection (AOI) by detecting defects that are invisible to optical cameras such as voids in ball grid arrays (BGAs), widely used in surface mount packaging. Different types of X-ray detector can be used for the automated inspection of PCBs, but which type is the best suited to the task?