I’ve had a MRI scan before, but not sure what you mean how it would be checked? As far as I understand it as the machine moves it makes multiple scans of the part bodypart, which can be looked at individually. But also since there are so many, they can be looked at in a way of a slow motion video and with the mouse you can go forward and backward to look at interesting areas. https://www.livescience.com/39074-what-is-an-mri.html
They take many many scans from different angles, and some clever sod wrote some software that will reconstruct data from all the scans into a single image of the brain, that evolves over time!
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