This parametric images reflect the similarity between the anisotropic diffusion of each pixel and that of its neighbors.

The owner of MRI equipment has to ensure that the equipment does fulfill the local requirements.
In some countries, the requirements are more stringent than in others; in other countries, they are nonexistent.
The user in general is unable to check power output, gradient strength, or even field strength. The manufacturer has to cover authorized hardware and software updates after the initial installation and has to give guarantee for the requirements. Specially designed computer programs usually supervise the power output of MRI devices and will not allow or will interrupt any imaging or spectroscopy procedure exceeding those limits considered safe.

See also European Medicines Agency, FDA information:
www.fda.gov/cdrh/safety/mrisafety.html

See Sequential Line Imaging.

Distribution of the relative strength of resonance as a function of frequency, which establishes a particular spectral line. Common line shapes are Lorentzian and Gaussian.

Spread in frequency of a resonance line in a MR spectrum. A common measure of the line width is full width at half maximum (FWHM).