Design Considerations for Ultra High Field MRI Magnet Systems

Abstract

Magnetic field strength has always been an important parameter to consider for Magnetic Resonance Imaging (MRI). It is generally agreed that the Signal to Noise Ratio (SNR) is approximately proportional to magnetic field strength [1,2], although other more subtle effects, such as chemical shift dispersion and susceptibility, also scale with field strength and can cause problems for good anatomical imaging. However, it is no surprise to learn that the engineering challenges presented by the commercial construction of higher field MRI systems are formidable. This chapter is an opportunity to introduce these to a wider audience.