Hi jodogne. I just started using Orthanc in a simple project to translate and organize images between a clinical PACS system and a research XNAT instance. It's been an absolute breeze to use.
The REST interface is wonderful, especially when compared to the frustrating world of XNAT. This project is extremely well done. Congrats! I'm looking forward to using it more. If an XNAT-like system were built on top of this, the world would be a better place, in my opinion. Thanks for such a great piece of software!