Just created an initial version of a DICOM plugin for Brayns, in 4 hours... :)
Source code is there:
https://github.com/favreau/Brayns-UC-DICOM
And you'll need the latest version of Brayns to make it work. Follow the readme instructions provided on the github page of the plugin and start enjoying cool visualization of your DICOM datasets.
This is of course work in progress, but if you keep an eye on the github repo, you will soon be able to visualize more.