Magnetic resonance imaging (MRI)
Magnetic Resonance Imaging (MRI) works in a completely different way than CT. It produces images based on the interaction between a strong magnetic field, radiofrequency impulses and tissue protons.
The contrast between tissues is not constant: water, for example, yields a signal that is white (hyperintense) or black (hypointense) in the images, according to the radiofrequency impulse sequence used. The different contrasts are used to study the normal and abnormal anatomy of patients; the combination of different sections and sequences is necessary to achieve full diagnostic information.
In radiology, MRI is one of the most sophisticated and expensive devices. The Diagnostic Imaging depertment of the Istituto Veterinario of Novara has a MRI particularly appropriate for studies in small animals.