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A method of generating homogeneous magnetic field outside permanent magnet structure is developed, in which the relationship between the saddle point position and homogeneous region is investigated. A novel monohedral permanent magnet (PM) configuration is proposed to achieve the homogeneous field in target region of magnetic resonance imaging (MRI) systems, in which a combined finite element and...
A new approach to the design of uniplanar gradient coils for fully open magnetic resonance imaging (MRI) system is proposed to build a specified gradient magnetic field in a target region. In this new methodology, the surface current density of the coil is represented by a two-dimensional Fourier series expansion. A cost function is constructed in terms of the summation of squared error and a penalty...
This paper presents a new method to simulate the magnetic characteristics of permanent magnet type of magnetic resonance imaging (MRI) device. The pulse currents in the gradient coils will introduce the effect of eddy currents and hysteresis in ferromagnetic material, which will worsen the quality of imaging. In order to reduce eddy currents in the ferromagnetic material, the passive shield made of...
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