This article presents the design and experimental characterization of an electromagnet rampable up to 1 T and tailored to meet the demands of a magnetic resonance imaging (MRI) system conceived for spatial resolutions at the level of tens of microns. For high image quality, MRI requires a homogeneous magnetic field over the field of view (FoV) where the sample is imaged. We have opted for passive shimming based on optimal pole profiling and measure a relative field inhomogeneity of 71 parts per million over a spherical FoV of 20 mm diameter. Fringe-field lines are strongly confined to avoid interference with other devices. The magnet performance closely follows our expectations from numerical simulations in all of the experimental tests carried out. In addition, we present the solutions adopted for thermal management and the design of a mechanical structure to distribute the weight and integrate the platform to move the sample in and out of the magnet.

中文翻译：

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用于高分辨率 MRI 系统的低场斜坡磁体

本文介绍了可斜升至 1 T 的电磁体的设计和实验表征，该电磁体经过量身定制，以满足为数十微米级别的空间分辨率设想的磁共振成像 (MRI) 系统的需求。为了获得高图像质量，MRI 需要在样本成像的视场 (FoV) 上有一个均匀的磁场。我们选择了基于最佳极点分布的无源匀场，并在直径为 20 毫米的球形 FoV 上测量了百万分之 71 的相对场不均匀性。边缘场线受到严格限制，以避免干扰其他设备。在进行的所有实验测试中，磁体性能密切符合我们对数值模拟的预期。此外，