**8. MRI and artifacts**

The quality of MR images depends on multiple factors that can significantly alter the outcome of the tests and therefore, the diagnosis of lesions. The so-called artifacts can determine impairment in the image formation and may be inherent to the method (apparatus, pulse sequence) and those related to the patient (involuntary physiologic recurrent movements and involuntary non recurrent movements). The physiological recurrent movements are related to breathing and heartbeat, while involuntary non periodic can be determined by swallowing or spontaneous movements of patients. The artifacts generally can alter the quality of the image during its acquisition. Therefore, in some cases, they interfere with the interpretation of the diagnosis [21,31].
