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Types of MRI sequences and their medical use
Summarizing the complicated and varied technology in the field of MRI in a brief description represents a challenge. However, it is helpful to know the basic types MR techniques and terminology as the technology has become ubiquitous in patient care. The following is by no means a complete description of MR technology but can help to orient someone new to the field. 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.
