Mechanical Stability Influenced by Assembly Errors of a 0.5 T Mobile MRI Superconducting Magnet

Mobile MRI makes it easier to perform MRI in settings with limited resources, which improves imaging accessibility in a greater range of contexts. We present a design for an open superconducting magnet structure that is lightweight and specifically suited for mobile MRI systems in order to further the development of MRI technology. Additionally, based on superconducting magnet manufacturing and assembly tolerance requirements and engineering experience, this study parameterizes the assembly errors of large-gap superconducting magnets, including parallelism errors and translation errors. The comparative simulation analysis revealed that certain areas of superconducting magnet will experience an increase in equivalent stress due to assembly errors. Specifically, the stress increase was particularly pronounced at the junctures between the support structure and both the upper and lower support plates, as well as at the barrel and support plate junction's annular area, where tension fluctuations were noticeable. In contrast, equivalent stress changes in other areas of the magnet were not obvious, indicating a low sensitivity to assembly errors in these areas. The outcomes of this study provide a reference for the design and optimization of lightweight and open superconducting magnet structures, contributing to the safety and reliability of mobile MRI systems.