Abstract：Objective To analyze the reliability level of positron emission tomography/magnetic resonance imaging (PET/MR)
equipment during clinical using the basic method of reliability verification. Methods The data including maintenance and work log
of two PET/MR equipment (PET/MR-1 and PET/MR-2) for a certain period of time were extracted, and the reliability parameters,
maintainability parameters, supportability parameters, availability and core component status of the equipment were analyzed. The
reliability level of the two equipments was compared. Results The total failure time of PET/MR-2 was 253.0 h less than that of PET/
MR-1, reducing 27.4%. The mean interfailure time of PET/MR-2 was 206.2 h longer than that of PET/MR-1 (P<0.05). There was no statistical difference in the reliability parameters of the two devices (P>0.05), and the state parameters of the core components
basically maintained stable operation. However, the PET/MR-1 caused two major failures of the core components due to the failure
of the auxiliary system. Conclusion Based on the basic method of reliability verification, the analysis of the reliability level of PET/
MR equipment in the clinical use process can provide an objective evaluation of the long-term stability of the equipment for medical
institutions, and indicate the direction of the key points of maintenance work.
