My understanding of an MRI is that it takes a cross-section image of your body and pieces it back together digitally. So it’s not exactly taking an instant snapshot, but instead is compositing several images taken over a duration of time.
Now, if your heart is pumping during the scan (which I’m hoping it does), then wouldn’t the size of the heart vary between each image?
Do they do something to account for this in the software, or do they physically do something during the scan?
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I asked my supervisor this when I was at uni and she said one method is to record the heartbeat and synchronise the image capture so that it takes the scans at the same point of each pump 🙂
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