IMPAX 6.5.1 Server Knowledge Base home > Configuring IMPAX Server with Administration Tools > Relevant Prior Manager
IMPAX supports two types of caches: the image cache and the web cache. The web cache holds images from the Curator, which uses wavelet compression to create them. The web cache copy is typically sufficient for display, prefetching, and printing purposes, but not suitable for transmission to other DICOM devices.
For relevant priors, if a copy exists in the image cache (either by lossy compression or lossless compression), then no prefetching from the Archive Server needs to be done. If nothing exists in the image cache the IMPAX database always defaults to retrieving the lossless DICOM images from the Archive Server when prefetching relevant priors. However, you can configure a site-wide map_ini setting to prefetch wavelets from the web cache instead, if they exist. The user can always view the original image if necessary through the Image area.
To prefetch wavelets by default
Log into the Database Server.
To check the current wavelet prefetching setting, type:
select * from MAP_INI where ini_section = 'MVF_SCP'
The wavelet prefetching setting is stored in USE_WAVELET_FOR_PREFETCHING. If it is set to FALSE (the default setting), the web cache locations are ignored when prefetching and the relevant priors are retrieved from the Archive Server.
To update the setting so that wavelets from web cache are prefetched, type:
update map_ini set ini_value = 'TRUE' where ini_key = 'USE_WAVELET_FOR_PREFETCHING' and ini_section = 'MVF_SCP'
To restart the MVF_SCP process and have this new map_ini setting take effect, type:
signal kill 0 MVF_SCP
Using CLUI, repeat step 5 for each machine in the cluster having the MVF_SCP process running.
See also
Topic number: 9470 Applies to: IMPAX 6.5.1 Server Knowledge Base |