I can imagine there not being great internet while you're building a hospital, but you know MRI rooms aren't that large, right? If you need to leave the Faraday cage, you just walk 10 feet.
Your customers are probably downloading GBs of data in advance because their reception/speeds outside the MRI room aren't sufficient.
I was making a glib comment to sum up the entirety of the issue. I actually typed up the full pedantic explanation, then deleted it. I told myself it was superfluous prose. Guess I was wrong!
Yes, the problem is that connectivity is often absent, poor, or slow combined with the fact that the app is useless without the entire dataset available. And you're collaborating with a team, so you have 10s-1000s of disconnected clients.
Your customers are probably downloading GBs of data in advance because their reception/speeds outside the MRI room aren't sufficient.