Design and analysis of a high-precision uniform field scanning micro-motion platform for ultra-high field magnetic...

To meet the scanning requirements for ultra-high magnetic field strength (≥7 T) and high uniformity within Magnetic Resonance Imaging (MRI) equipment, this paper presents the design and implementation of a fully automated five-axis micro-positioning platform with a positioning accuracy of 50 μm. The platform enables full-area magnetic field measurement inside MRI devices via high-precision automatic scanning, providing data assurance for the precise current loading of the homogeneous field system. A systematic design of the motion actuator, probe fine-tuning mechanism, and probe rod of the micro-motion platform is described, utilizing 3D modeling software. A three-dimensional model of the micro-motion platform driven by a ball screw is established, and its static, dynamic, and vibration characteristics are analyzed via finite element analysis. The results show that the design scheme exhibits excellent mechanical properties, dynamic characteristics, and stability. The micro-motion platform has been successfully applied and tested on a 7 T MRI system, enabling precise scanning of magnetic field data. This study offers design insights for magnetic field scanning devices in magnetic resonance equipment.