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Correlation Time
The characteristic time between significant fluctuations in the local magnetic field experienced by a spin due to molecular motions. For values of the correlation time such that the magnetic field as a function of time has large Fourier components near the resonance frequency, the T1 relaxation time will be shortened.
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The ability of magnetic compounds to increase the relaxation rates of the surrounding water proton spins.
Relaxivity is used to improve the contrast of the image, and to study tissue specific areas where the contrast agent better diffuses or to perform functional magnetic resonance imaging.
The relaxivity of MRI contrast agents depends on the molecular structure and kinetic of the complex. To increase the number of water molecules that are in the inner sphere of the complex, or to slow down the molecular rotational correlation time, are possibilities to improve the water relaxivity.
Relaxivity units ( r1, r2 ) are mM-1 * sec-1 (at varying temperatures).

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Measurements of the relaxivity of gadolinium chelates in tissues in vivo(.pdf)
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Audio Frequency ArtifactInfoSheet: - Artifacts - 
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Quick Overview

Artifact Information
NAME Audio frequency
DESCRIPTION Ghosting, lines or spots
REASON Wrong modulation at audio rate, wrong audio signal
HELP AC-line synchronization

Two types of audio-frequency problems are possible:

1. Modulation of the MR signal at an audio rate 2. Audio signal component at digitizer input
Problem 1 looks like ghosts, weak copies of the real image, displaced along the phase encoding direction. The number and intensity of the ghosts depends upon the relationship between the period of the audio modulation and the repetition time.
Problem 2 shows up as lines or spots at the appropriate points along the frequency direction. If there is no correlation between the audio period and TR, lines are generated or discrete spots occur.

Image Guidance
Both problems can be lessened by use of AC-line synchronization (line trigger).

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