MRI Basics: What is MRI?

In which I explain the very basics of MRI...

Nuclear Magnetic Resonance (NMR) allows us to detect a signal due to a fundamental quantum property of atoms - spin (which I will explain in an upcoming post). Magnetic Resonance Imaging (MRI) uses these same principles to obtain images of (usually) hydrogen atoms in a substance/tissue.

(N)MRI is a non-invasive, non-ionising, imaging modality and is widely used in hospitals worldwide. What does all that mean?