In clinical PACS the correction procedure can be implemented at two sites (Fig. 16). If image standardization is performed before archiving, the procedures are installed at the acquisition gateway and performed once. A corrected image is then archived and can be sent to the user with no preprocessing functions to be performed. However, if rough images are to be archived and standardization is to be performed at the time of an image request, the standardization procedures are installed at the archive gateway or directly at the workstation. Preprocessing functions are then performed at any time an access to the image is requested. This may slow down the system response time. However, a very important advantage of this option is that it prevents irreversible damage to images in
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