To guarantee the best possible image quality, and to detect any malfunctioning, regular quality control is recommended.
The different parameters in MRI control include: the signal, geometric parameters, NMR, artifacts and spectroscopy.
The main signal parameter is the signal-to-noise ratio measurement. The measurement is carried out:
The uniformity of the emitting coils must also be evaluated, as heterogeneity of radiofrequency emission could lead to differences in flip angles in the volume, thus modifying contrast. This measurement, given as a percentage, is carried out on a homogeneous phantom, if necessary by sliding the image or increasing the number of acquisitions when the signal-to-noise ratio is low.
The aim of these tests is to check the quality of spatial encoding (slice selection, phase and frequency encoding). Useful criteria in this test include: