Abstract

A portable magnetic resonance imaging (MRI) imager may help this medical imaging modality to reach out areas that are remote or/and hard to access, and situations that the environment is dynamic, for example, in an ambulance. Permanent magnet array is a popular option to supply the main magnetic field for imaging. It allows portability, does not consume power, and guarantees a low cost. However, the magnet field it generates does not have a linear gradient, thus the acquired signals from the system and the image are not directly linked by Fourier Transformation. There are different kind of magnet arrays that can be used in a portable system. Halbach array with a transverse magnetic field provide an option. Besides, Aubert array with a longitudinal magnetic field that was recently proposed is a good alternative [1]–[2]. For a magnet array, the field strength, field homogeneity, and field pattern are directly related to the quality of image reconstruction [3]. In this talk, different magnet arrays and the characteristics of the magnetic fields they generate for imaging in a low-field MRI system will be introduced. The effects of the magnetic fields on the image reconstruction will be analysed in detail.

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