[madacol]

You should also take into account patients that are already worried, and how much peace it brings when the scan results come clean

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But I am really worried with a deeper issue.

A full-body MRI scan provides information, and supposedly with no harm (at least physically)

According to your arguments, the medical system doesn't currently know what to do with it to provide an overall benefit (Allow me to be skeptical, but let's roll with it)

So your attitude is to not collect the information in the first place. I assume you are thinking that because there are no immediate benefits and lots of cost

But I'm sure there are, at least, future benefits. Why not instead start learning from this new source of information to do good in the future?, like at least, collect it for future references / comparisons with future scans

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If you still think the benefits do not compensate the cost, then fine, that's a completely personal decision that should not be imposed to others.

Doctor's role is to communicate as accurately as possible the benefits/harm of an action, and let patients decide for themselves if the cost is worth it or not

[Panzer04]

The root of the issue seems to be that general scans are simply not that informative unless problems are very obvious or couched with other symptoms. If they can't tell the difference between a benign lump and a tumor without additional information then they don't actually serve a useful purpose. Garbage data is useless, after all.

Using them in a targeted manner because the patient is reporting symptoms or somesuch appears to be a different use case. The signal to noise ratio of an untargeted scan is otherwise too high to be of much value determining treatment.