6.4.2 Client/Server Model
The three major features of the client/server model are:
(1) Images are centrally archive at the PACS server.
(2) From a single worklist at the client workstation, an end-user selects images via the archive server.
(3) Because workstations have no cache storage, images are flushed after reading.
Data work flow of the client/server PACS model is shown in Figure6.3. Following the numerals:
1. Images from an exam acquired by the imaging modality are sent to the PACS archive server.
2. PACS archive server stores the exam.
3. End-user workstations, or client workstations, have access to entire patient/study database of archive server. End-user may select preset filters on the main worklist to shorten the number of worklist entries for easier navigation.
4. Once exam is located on worklist and selected, images from the PACS exam are loaded from the server directly into the memory of the client workstation for viewing. Historical PACS exams are loaded in the same manner.
5. Once end-user has completed reading/reviewing the exam, the image data are flushed from memory, leaving no image data in local storage on the client workstation.
Figure 6.3 Client/server architecture general data flow. Major features are images are centarlly archived in the server, images are requested from the server through a worklist at the workstation, workstations have no cache storage, and images are flushed after reading. See text for explanation of work flow steps in numerals.