Abstract: A protected health information (PHI) service is provided which de-identifies medical study data (e.g., digital imaging and communications in medicine (DICOM) study data) and allows medical providers to control PHI data, and uploads the de-identified data to a remote service system. The PHI service, or an associated service, hosted within an organization performing scans, maintains a database of personally identifiable information, and enables the user to access PHI without having to establish a connection to a virtual private network or WiFi network of the medical service provider. The system also increases the speed, efficiency and flexibility of the technology of medical imaging and analysis over computer networks by correlating unique identifiers in the PHI Service in order to accept DICOM study data over time, and track and retrieve what PHI data has changed regardless of the chronological order in which it was received.