Development of a temperature-variable magnetic resonance imaging system using a 1.0T yokeless permanent magnet |
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Authors: | Terada Y Tamada D Kose K |
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Institution: | Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan |
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Abstract: | A temperature variable magnetic resonance imaging (MRI) system has been developed using a 1.0 T permanent magnet. A permanent magnet, gradient coils, radiofrequency coil, and shim coil were installed in a temperature variable thermostatic bath. First, the variation in the magnetic field inhomogeneity with temperature was measured. The inhomogeneity has a specific spatial symmetry, which scales linearly with temperature, and a single-channel shim coil was designed to compensate for the inhomogeneity. The inhomogeneity was drastically reduced by shimming over a wide range of temperature from −5 °C to 45 °C. MR images of an okra pod acquired at different temperatures demonstrated the high potential of the system for visualizing thermally sensitive properties. |
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Keywords: | Permanent magnet Temperature control Inhomogeneity Single-channel shim coil |
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