Designing method of magnetic resonance biplane self-shielding gradient coil based on gradient inductance constraint and graphic processing unit acceleration algorithm / 中国医学影像技术

ABSTRACT

Objective: To purpose an effective solution of reducing MRI time when rapid change and gradient switching rate of gradient magnetic field are restrained by eddy current caused by self induction and mutual inductance of gradient coil in MR system. Methods: With the constraints of gradient inductance minimization and gradient magnetic field self-shielding, a mathematical model was 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 (GPU) acceleration algorithm was used to realize the calculation of gradient coil. Results: By minimizing gradient inductance, eddy current effect could be effectively reduced, the magnetic field self-shielding could be realized, the gradient switching rate was good, and the overall performance of the gradient coil could be improved. Conclusion: The new target field point method for biplane gradient coil is effective and feasible, which can realize minimization of gradient inductance and designing self-shielding gradient coil of gradient magnetic field.