MRI Terminology

2. Preferred unit of magnetic flux density or magnetic field intensity.
5. Single or multiple loops of wire designed to produce a magnetic field from current flowing through the wire or to detect a changing magnetic field by voltage induced in the wire.
8. Ability of an imaging process to distinguish adjacent soft tissues from one another.
10. MRI technique used to minimize motion artifacts.
11. A contrast agent used in MRI.

1. Unit of magnetic flux density in the older CGS system.
2. Longitudinal relaxation time. Characteristic time constant for spins to tend to align themselves with the external magnetic field.
3. Transverse relaxation time. Characteristic time constant for loss of phase coherence among spins oriented at an angle to the main magnetic field owing to interacti9on between the spins.
4. Area of the anatomy that is being imaged.
6. Stray magnetic field that exists outside the imager.
7. Atmospheric gases such as nitrogen and helium that have been cooled sufficiently to condense into a liquid.
9. Signal-to-noise ratio-enhancing technique in which the same MRI signal is repeatedly acquired two or more times and then is combined and averaged.