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Types of MRI sequences and their medical use
![MRI](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbCq4fhExSBgOs9iGPQWPtEahClVra8yFPK6fHd5VUsmZtegGoHHXj0teeaiFA1BGH7arZDqNHr9s5RbZOTlpRWNNGfZmJqFy1E-S5RRnbia-AQjUy6QwndYLN9wAiNXfbJERUg2Y54Yk/s280/MRI.jpg)
Magnetic Resonance Imaging is based on localizing hydrogen atoms in tissue using radiofrequency wave pulses in an applied magnetic field. As the patient lies in the scanner, a magnetic field is applied, which causes the hydrogen proton in the body to “spin” in the direction of the magnetic field. There are two major types of magnets used: permanent magnets and superconducting magnets. Permanent magnets can be thought of a two bar magnets made of metallic alloys that produce a inform magnetic field between them. Another type of magnet is a superconducting magnet, which is encased in liquid helium to prevent energy loss.