As far as I've ever heard, an MRI without contrast has no risk itself, and any risk comes from acting on the data.
Beyond that, there is a reliance that you do not have any implants etc., even some tattoos. And you tell the truth about it. From the clinics point of view too risky.
Instead, think about interacting with someone who a) is so convinced that they need an exploratory MRI but b) can't convince a doctor of that need. I'd be afraid that either I'll be stuck dealing with someone perseverating over a totally normal anatomical variation (and everyone has a few). If they get sick later, I might also get dragged into a debate over whether I should have noticed something on that scan, done a different scan, or whatever, possibly with big legal implications.
This is why our techs will happily scan a fruit or something, but don't run an ad-hoc clinic.
This one was specifically a comment about "zero risk" on MRI, it's not true. Low risk, sure. But people have been hurt.
I also suspect any clinician is going to look askance at a low risk action that isn't necessary, but the potential liability is the kicker here.
Nothing is totally risk free, but compared to most medical procedures--and most activities of daily living--MRIs are a walk in the park. For a subject with no implanted devices, I would bet the drive to the scan center is much more dangerous. I just flipped through MAUDE (https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfMAUDE/d...) and I couldn't find any adverse events that were more severe than a small burn or blister.
There have been deaths of course, also, but not due to normal operation.
> The magnetic fields that change with time create loud knocking noises which may harm hearing if adequate ear protection is not used. They may also cause peripheral muscle or nerve stimulation that may feel like a twitching sensation.
> The radiofrequency energy used during the MRI scan could lead to heating of the body. The potential for heating is greater during long MRI examinations.
Minimal, perhaps negligible? Absolutely. Worth risking a license for a mere $3k? Probably not.