Development of the 0.01 C temperature system using the phase change thermal storage coolant for the small permanent magnet for MRI

MRI用小型永磁体相变蓄热冷却剂0.01℃温度系统的开发

• 批准号: 23656156
• 负责人: OGAWA Kuniyasu
• 金额: $ 3万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23656156/
• 关键词: MRI; 温度制御; 周波数安定化; 核磁気共鳴法; 永久磁石; 相変化

In a small permanent magnet, when heat flows in from the magnetic circumference, a magnetic temperature changes and magnetic field intensity changes. Magneto temperature is stabilized by making the magnetic circumference circulate through a phase change thermal storage medium as a coolant. In this research, it tried to raise the stability of a magnetic field by making the circumference of a neodymium magnetic body circulate through the phase change thermal storage medium which controlled temperature. The small permanent magnet which can circulate through a coolant for this purpose was manufactured.The magnet circumference and a gradient field coil were made to circulate through a coolant, and magneto temperature was stabilized. As a result, the magnetic field was stable by circulating a coolant. On the other hand, when a phase change thermal storage medium was used for a coolant, the effect of stabilization seldom appeared.

在小型永磁体中，当热量从磁体周围流入时，磁体温度会发生变化，磁场强度也会发生变化。 通过使磁体圆周通过作为冷却剂的相变蓄热介质循环来稳定磁体温度。 在这项研究中，试图通过使钕磁体的圆周通过控制温度的相变蓄热介质循环来提高磁场的稳定性。 为此，制造了可在冷却剂中循环的小型永磁体。使磁体圆周和梯度磁场线圈在冷却剂中循环，从而稳定了磁电机的温度。 结果，通过使冷却剂循环，磁场变得稳定。 另一方面，当相变蓄热介质用作冷却剂时，很少出现稳定效果。