Multi-objective optimization of gradient coil for benchtop magnetic resonance imaging system with high-resolution

doi:10.1088/1674-1056/23/2/028703

Abstract Significant high magnetic gradient field strength is essential to obtaining high-resolution images in a benchtop magnetic resonance imaging (BT-MRI) system with permanent magnet. Extending minimum wire spacing and maximum wire width of gradient coils is one of the key solutions to minimize the maximum current density so as to reduce the local heating and generate higher magnetic field gradient strength. However, maximum current density is hard to optimize together with field linearity, stored magnetic energy, and power dissipation by the traditional target field method. In this paper, a new multi-objective method is proposed to optimize the maximum current density, field linearity, stored magnetic energy, and power dissipation in MRI gradient coils. The simulation and experimental results show that the minimum wire spacings are improved by 159% and 62% for the transverse and longitudinal gradient coil respectively. The maximum wire width increases from 0.5 mm to 1.5 mm. Maximum gradient field strengths of 157 mT/m and 405 mT/m for transverse and longitudinal coil are achieved, respectively. The experimental results in BT-MRI instrument demonstrate that the MRI images with in-plane resolution of 50 μm can be obtained by using the designed coils.

Keywords: magnetic resonance imaging gradient coil target field method wire spacing

Received: 15 April 2013
Revised: 03 May 2013
Accepted manuscript online:

PACS:	87.61.-c	(Magnetic resonance imaging)
	84.32.Hh	(Inductors and coils; wiring)
	02.30.Zz	(Inverse problems)

Fund: Project supported by the Natural Science Foundation of the Ministry of Science and Technology of China (Grant No. 2011ZX05008004) and the Science Fund of the Committee of Science and Technology of Beijing, China.

Corresponding Authors: Wang Wei-Min
E-mail: wmw@pku.edu.cn

About author: 87.61.-c; 84.32.Hh; 02.30.Zz

Cite this article:

Wang Long-Qing (王龙庆), Wang Wei-Min (王为民) Multi-objective optimization of gradient coil for benchtop magnetic resonance imaging system with high-resolution 2014 Chin. Phys. B 23 028703

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Multi-objective optimization of gradient coil for benchtop magnetic resonance imaging system with high-resolution

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