It is possible to regenerate your local imagebox via the "filesystem" option. Click "filesystem", then select the folder of your imagebox (default: c:\kpacs\imagebox), uncheck the "check for dicom compliancy" option because all files in the imagebox are dicom compliant and this would slow down the process. Click "Accept" and the imagebox will be searched through. Select all studies that where found and click "viewer". The database will be regenerated (this may take a while for large databases).
For complete regeneration make a copy of the whole imagebox folder (for instance "c:\k-pacs\imagebox-copy", clear local database (go to "local settings" and select "clear local imagebox"). Do as descibed above with the imagebox-copy folder.