Cooling Performance Elevation of a 3T Animal Gradient Assembly with Hollow Pipe Axial Gradient Coil

The cooling performance of gradient coils is an important indicator of magnetic resonance imaging (MRI), which is closely related to the image resolution of MRI. This article uses COMSOL Multiphysics finite element software to conduct heat transfer simulation analysis on magnetic resonance imaging gradient coils, providing technical support for the design and finite element simulation of efficient heat dissipation gradient coils. Firstly, point data for the coil winding is obtained through the target field-based method. Then, a three-dimensional model is created using Solidworks. Finally, the three-dimensional model of the gradient coil is imported into COMSOL for multi-physical simulation coupling simulation and analysis, including magnetic field and solid heat transfer. In this paper, the temperature distribution of two groups of gradient coils with different cooling structures is simulated when the X coil current, Y coil current and Z coil current are separately supplied. Among them, one group is a gradient coil using a hollow water-cooled plastic pipe cooling structure, and the other group is a gradient coil using a hollow wire water-cooled structure. Comparing the heat transfer simulation results of two sets of gradient coils, it is found that gradient coils with hollow wire water-cooled structures have better heat dissipation performance, which is of great reference significance for the cooling structure design of actual gradient coils.