DICOM proceeds through a volume of .dcm files and maintaining all standard as well but still it is not free from attacks. In this paper I present the RTStructure based GUI and the security model of DICOM communication. Here, I use massage digest with the metadata of each volume of DICOM. Metadata is nothing but data about data and it is required for constructing each volume of .dcm files. In my case, it is standardized and static with the help of python packages. After successful construction .dcm files, cryptographic hash function is applied. Hence, a secure RT-Structured based annotation model is ready for storing and accessing medical information among various medical devices by maintaining HIPPA and PACS standard.