We use eRAD. They have the ability to accept studies from outside of the office without a VPN.
I have not used these vendors, but you might want to check them out.
Xrayline.com – Cloud-based
RamSoft
I am not sure if Dcm4Che.org has a diagnostic viewer, but it is open-source. You would have to pay someone to set it up, but you can download the software for free.
Thanks,
Brian Williams
Co-Administrator
Operations
Diagnostic Imaging Associates, Inc.
698 12th St SE
Suite 145
Salem, OR 97301