Hi Anton
I've not tried it recently, but there is no reason I know of for it to not work. It has worked previously. Last time I tried was in the single core days of the Pi, and it worked but the database was fairly slow. I believe David Platten tried it with a multi-core Raspberry Pi and it was ok.
I am confident that it would be competent to import the data. It would probably struggle with performance with large databases when using the web interface and exports, or if you wanted to calculate and render skin dose maps. 30 CT RDSRs a day wouldn't break a sweat.
I haven't used the Orthanc web viewer much, but I would expect that to be fine too.
Good luck - it would be interesting to hear how you get on!
Kind regards
Ed