The Design And Implementation Of DICOM Middle Software And Access Control Model In Formation Integration Platform

With the promotion of the informatization construction in the hospital, the normal business processes of hospitals and some medical organizations have been greatly simplified, which not only improves the working efficiency, but also reduces their cost. Meanwhile, with the new progress of the medical technology and the update and improvement of the biology medical equipment, in respect of patients to get treatment, the conditions have been greatly improved. However, as every hospital operates independently, it is impossible to get patients’diagnostic data unless visiting the hospital where they have been diagnosed, which brings lots of inconvenience for patients to get subsequent diagnosis. Too often, a patient needs the same examination for his disease in a different hospital, but it is hard for the doctor to look up his medical cases and history of illness. Such problem not only causes patients to get redundant diagnose, which brings to them heavy financial burden, but also cause inconvenience to the doctor’s working. In response to the above situation, the research about the integrated medical information system has got general development.The data integrated by the integrated medical information system is patient-centered; it includes all kinds of text data and image data. The diversity and complicacy of the data requires us to design reasonable and high-efficiency database system. In the system, the image data is mainly refers to the image files which are created by various medical devices. DICOM (Digital Imaging and Communication in Medicine) standard is a current international standard, which is used in medical imaging and the image exchange between medical systems using network. The standard is followed by every medical equipment manufacturer. Therefore, as to the integrated medical information system, it is a key point to design a communication middleware which follows the DICOM standard and is used for exchanging medical image files. Meanwhile, the reliability and safety of the system can hardly be guaranteed without the robust access control mechanism.By combining with the project "Development and demonstration of the open medical information integration system", this article briefly describes the relevant technologies which are used in our project, and it briefly analyzes the current status of research and application of these technologies at home and abroad. The paper also presents the designs and implementations of the database, the authority constraint access control model and the DICOM middleware.Based on the aim and localization of the project, after analyzing the requirement of the relevant business, we designed a set of database concept model and logic model, which applies to describe the integrated medical information system. In addition, based on the set of models, we established a working database system. Based on studying many access control models, we designed and implemented the MRBAC (Multi-level Role Based Access Control) model. The model describes organization structure as information categories, and defines the security label。It also makes the organization associate with the roles that can configure the security level conveniently. The model works well in fine and coarse granularity access control on permission.In practical application system, we also design the cache strategy. The experiment shows that ARBMLC models is efficient, flexible and security.After in-depth studying the communication norms of the DICOM standard, we have designed and implemented the required service classes, based on which the client module and the server module were constructed. Our middleware not only acts as a client that can use various services, but also a server that accepts requests from outside and provides the needed services. As our system well meets the communicated requirement between medical image devices which followed the DICOM standard and medical systems, it can greatly support the image data integration, which is an important part of the medical information integration platform.The production of the thesis has been verified in the project. The aspects and problems in the current system which still need to be perfected are analyzed at the end of this article.