Diagnostic imaging including computed tomography (CT) is very important for dental implant treatment. The precise information obtained by imaging examination can ensure safe, effective implant treatment. CT data is the ultimate private information, and so it should be handled carefully to protect privacy. This review explains the rules to be followed for protecting private information when handling digital data including CT data. It also explains how to obtain appropriate CT data to be used for implant simulation, as well as important diagnostic findings on CT for implant treatment.