This paper deals with the new concept of network based virtual collaborative environment to support clinical applications of 3D models of human tissues, created from CT/MR data. It is a topic lying between 3D tissue modeling and PACS systems. Designed system allows clinical realizations of 3D applications as a service to clinical workplaces, provided by specialized 3D laboratory, even over great distances. Problem lies within the need of doing necessary consultations, corrections and verifications distantly. This is solved by our system in the form of virtual collaborative environment. This system is built upon three-layer client-server architecture. Our application is focused on 3D tissue modeling. Generally it can be used as a basis for other similar applications.