Zhang Peng, Shi Yikai, Wang Wendong, Wang Yaohui
School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, China.
School of Medicine, Southern China University of Technology, Guangzhou, Guangdong, China.
Technol Health Care. 2018;26(1):119-132. doi: 10.3233/THC-171081.
To design planar gradient coil for MRI applications without discretization of continuous current density and loop-loop connection errors.
In the new design method, the coil current is represented using a spiral curve function described by just a few control parameters. Using a proper parametric equation set, an ensemble of spiral contours is reshaped to satisfy the coil design requirements, such as gradient linearity, inductance and shielding.
In the given case study, by using the spiral coil design, the magnetic field errors in the imaging area were reduced from 5.19% (non-spiral design) to 4.47% (spiral design) for the transverse gradient coils, and for the longitudinal gradient coil design, the magnetic field errors were reduced to 5.02% (spiral design). The numerical evaluation shows that when compared with conventional wire loop, the inductance and resistance of spiral coil was reduced by 11.55% and 8.12% for x gradient coil, respectively.
A novel spiral gradient coil design for biplanar MRI systems, the new design offers better magnetic field gradients, smooth contours than the conventional connected counterpart, which improves manufacturability.
设计用于MRI应用的平面梯度线圈，避免连续电流密度离散化和线圈-线圈连接误差。
在新的设计方法中，线圈电流用仅由几个控制参数描述的螺旋曲线函数表示。使用适当的参数方程组，对一组螺旋轮廓进行重塑，以满足线圈设计要求，如梯度线性、电感和屏蔽。
在给定的案例研究中，对于横向梯度线圈，通过使用螺旋线圈设计，成像区域的磁场误差从5.19%（非螺旋设计）降低到4.47%（螺旋设计）；对于纵向梯度线圈设计，磁场误差降低到5.02%（螺旋设计）。数值评估表明，与传统线环相比，x梯度线圈的螺旋线圈电感和电阻分别降低了11.55%和8.12%。
一种用于双平面MRI系统的新型螺旋梯度线圈设计，与传统的连接式线圈相比，新设计提供了更好的磁场梯度、更平滑的轮廓，提高了可制造性。
