An MRI system for imaging a body-part of a patient under analysis, wherein the MRI system comprises an MRI scanner for applying a magnetic field to the body-part and for measuring a response signal of the body-part to the magnetic field, a computing machine for generating one or more images of the body-part from the response signal, an injector head assembly for injecting at least one medical fluid into the patient, the injector head assembly comprising a control unit for controlling operation of the injector head assembly and a clock unit for providing a clock signal of the control unit thereto, the clock signal having a clock frequency, characterized in that the MRI system comprises a memory structure (425;450) storing an indication of a plurality of candidate values of the clock frequency, means (410,420,435,445,455) for triggering an adjusting of the clock frequency, in an operative condition of the MRI system wherein the MRI system is in an MRI installation ready to be used by one or more health care professionals to analyze the body-part of the patient, comprising a) means (410;435) for entering an adjusting command manually by the health care professionals in response to a detection of artifacts in the images by the health care professionals and means (420;445) for triggering the adjusting of the clock frequency in response to the adjusting command; and/or b) means for monitoring the images generated by the MRI system, means for detecting a degradation of the images according to artefacts thereof, and means for triggering the adjusting of the clock frequency in response to the degradation of the images, means (420;445) for selecting a new value different from a current value of the clock frequency automatically among the candidate values indicated in the memory structure (425;450) in response to said triggering the adjustment, and means (420;445) for adjusting the clock frequency from the current value to the new value. an MRI scanner for applying a magnetic field to the body-part and for measuring a response signal of the body-part to the magnetic field, a computing machine for generating one or more images of the body-part from the response signal, an injector head assembly for injecting at least one medical fluid into the patient, the injector head assembly comprising a control unit for controlling operation of the injector head assembly and a clock unit for providing a clock signal of the control unit thereto, the clock signal having a clock frequency, a memory structure (425;450) storing an indication of a plurality of candidate values of the clock frequency, means (410,420,435,445,455) for triggering an adjusting of the clock frequency, in an operative condition of the MRI system wherein the MRI system is in an MRI installation ready to be used by one or more health care professionals to analyze the body-part of the patient, comprising a) means (410;435) for entering an adjusting command manually by the health care professionals in response to a detection of artifacts in the images by the health care professionals and means (420;445) for triggering the adjusting of the clock frequency in response to the adjusting command; and/or b) means for monitoring the images generated by the MRI system, means for detecting a degradation of the images according to artefacts thereof, and means for triggering the adjusting of the clock frequency in response to the degradation of the images, a) means (410;435) for entering an adjusting command manually by the health care professionals in response to a detection of artifacts in the images by the health care professionals and means (420;445) for triggering the adjusting of the clock frequency in response to the adjusting command; and/or b) means for monitoring the images generated by the MRI system, means for detecting a degradation of the images according to artefacts thereof, and means for triggering the adjusting of the clock frequency in response to the degradation of the images, means (420;445) for selecting a new value different from a current value of the clock frequency automatically among the candidate values indicated in the memory structure (425;450) in response to said triggering the adjustment, and means (420;445) for adjusting the clock frequency from the current value to the new value.