Integration should be the key requirement in any new RIS procurement and so the solution will depend on your proposed EPR/ICRS solution and PACS solution. Ideally you want desktop integration with both. Your LSP should now be the first point of contact.
With an ICRS, a RIS is really a legacy system as many of the functions (e.g. patient demographics, appointment booking, digitial dictation and reporting can potentially be taken over by common services on the ICRS system.
For specific OBS requirements for a RIS, the RCR document Clinical Radiology and Electronic Records provides a useful overview and the requirements for integration with PACS a covered broadly in the national OBS.
I do not have any documents but do suggest you include a consideration of IHE in the specification and tendering exercise. www.rsna.org/IHE then FAQ; also http://www.ihe-uk.org/. This will assist with workflow and interoperability with non-radiology information systems.
I would be interested to hear from users of the Torex (formerly Amersham) RMS radiology information system.
Having just taken the post as PACS Project manager, I am pulling out hair as I forsee major integration nightmares ahead. There appear to be fundamental issues with response times, call-centre and fault-logs.
Interestingly enough, it appears that Torex has been selected as the supplier (with Accenture) for the north-east cluster...
I have created an IHE specific document for RIS requirements, feel free to use, it. I have more detailed documentation and methodology including scenarios, scripts for Proof of Concept PACS, RIS etc... Rex Osborn RT....