MRI is basically a huge magnet that emits energy (Radio-frequency pulse) into the body.
Radiofrequency pulse causes the protons in H+ atoms to spin in different directions from which it used to spin.
When the pulse stops .. the protons go back to spinning in the normal direction .. it releases energy.
As tissues vary in a number of protons in it .. the energy emitted differ from tissue to tissue.
Interpreting this energy using certain techniques enables us to represent every tissue in a unique density.
We are going to discuss some of the most commonly used<unk>  and when to use each one of them.
This video simplifies the concept of T1 and T2 relaxation times and their application in MRI.
MRI sequences
Earth's field NMR
Pain MRI
Spinal stenosis x ray
Magnetic resonance angiography
Spectroscopy
Neurochemistry
Mononucleosis/Imaging studies