After the recent studies on virtual learning communities of medical education were described, the per-sonal service of learning resources in virtual learning communities was elaborated in aspects of personal learning re-sources and platform with medical online open learning platform, namely the basic medical teaching resource net-workas an example .

Objective CR's advantages of flexibility are analysed, and its reasonable clinical use are evaluated. Methods To compare CR and general roentgenography. Results CR system is one of main X-ray photography. Conclusion Because of the unique advantages of CR, CR and DR will be still clinically equally important in the future for a long period of time.