# MRI and Fourier transform to form an image

I read about how MRI works briefly, by flipping the water molecules using a magnetic field to the correct state then send the radio wave to these atoms and have it bounces back to be received by receiver coils and apply Fourier Transform to figure out the imaging. My question is, how does Fourier Transform works in this case in the receiver coil to figure out the original location of the atom, is it based on the intensity of the radio wave or something else?

Gold Member
The magnetic field varies along one axis of the body, so protons in your head emit radio waves of a slightly different frequency than protons in your feet. The Fourier transform allows one to extract the different frequencies from the overall radio signal in other to figure out where each part of the signal is coming from.

So, is the signal received from the atoms like a radio wave? I understand the signal is weak because you need coils right around the body but is it possible to strengthen this signal? Stronger signal directed at the atom would have a stronger signal bounces back? I'm talking about receiving it like a radio signal, if it's possible and someone done it before.