| 黄清明.基于梯度电感约束和GPU加速算法的磁共振双平面自屏蔽梯度线圈设计方法[J].中国医学影像技术,2020,36(3): |
| 基于梯度电感约束和GPU加速算法的磁共振双平面自屏蔽梯度线圈设计方法 |
| Design method of magnetic resonance biplane self-shielding gradient coil based on gradient inductance constraint and GPU acceleration algorithm |
| 投稿时间：2019-05-11 修订日期：2020-03-23 |
| DOI： |
| 中文关键词: 梯度线圈 涡流 梯度电感 自屏蔽 加速算法 |
| 英文关键词:Gradient coil Eddy current Gradient inductance Self-shielding Acceleration algorithm |
| 基金项目:国家重大科学仪器设备开发专项资助项目（2013YQ170463）、上海市高校“高峰高原”学科Ⅱ类高原学科建设项目（20180063）、上海健康医学院教师教学能力专项“培优计划”项目（PY（19）06-G1-01）和上海健康医学院医教协同（产教融合）应用型人才示范项目（JG（19）06-B2-01） |
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| 中文摘要: |
| 目的 针对磁共振成像系统(Magnetic Resonance Imaging,简记为MRI)梯度线圈的自感和互感引起的涡流,会抑制梯度磁场的快速变化,影响梯度切换率,减缓磁共振成像时间的问题。方法 采用梯度电感最小化和梯度磁场自屏蔽等约束条件,结合目标场点法建立数学模型,求解双平面梯度线圈的绕线分布,以减小梯度线圈的磁场能量,降低涡流等对梯度线圈性能的影响。同时,为缩短数值计算工具MATLAB软件对以上复杂数学模型矩阵求解的运算时间,采用图形处理单元(Graphic Processing Unit,简记为GPU)加速算法实现梯度线圈的设计计算。结果 采用最小化梯度电感,能有效降低涡流影响,实现磁场自屏蔽,具有良好的梯度切换率,改善了梯度线圈的整体性能。结论 本文的双平面梯度线圈新型目标场点法算法有效可行,能够实现梯度电感最小化和梯度磁场的自屏蔽的梯度线圈设计。 |
| 英文摘要: |
| Objective For the eddy current caused by self-inductance and mutual inductance of gradient coil in magnetic resonance imaging system, the fast change of gradient magnetic field will be restrained, the gradient switching rate will be affected, and the time of magnetic resonance imaging will be slowed down. Methods With the constraints of gradient inductance minimization and gradient magnetic field self-shielding, a mathematical model is established by combining the target field point method to solve the winding distribution of the double-plane gradient coil, so as to reduce the magnetic field energy of the gradient coil and the eddy current on the performance of the gradient coil. At the same time, in order to shorten the operation time of solving the above complex mathematical model matrix by MATLAB software, Graphic Processing Unit acceleration algorithm is used to realize the calculation of gradient coil. Results By minimizing the gradient inductance, the eddy current effect can be effectively reduced, the magnetic field self-shielding can be realized, the gradient switching rate is good, and the overall performance of the gradient coil can be improved. Conclusion The new target field point method for biplane gradient coil is effective and feasible, which can realize the minimization of gradient inductance and the self-shielding gradient coil design of gradient magnetic field. |
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