See Spin Spin Coupling.

Spin dephasing for complex flow patterns like turbulence. This effect must be taken into account when evaluating the extent of vascular stenosis. The degree of the signal loss depends on the flow model and pulse sequence used.

(J) The SI unit of work or energy.
Definition: The work done by a force of 1 newton acting to move an object through a distance of 1 meter in the direction in which the force is applied.
Since kinetic energy is one half the mass times the square of the velocity, 1 joule is the kinetic energy of a mass of two kilograms moving at a velocity of 1 m/sec.
The joule is named for the British physicist James P. Joule.