Human body coil design for magnetic resonance imaging at 7 tesla英文电子书.pdf

Human-Body Coil Design for Magnetic Resonance Imaging at 7 Tesla Roney Abraham* I, Tamer S. Ibrahim1 (1) School ofElectrical and Computer Engineering and Center for Bioengineering, The University ofOklahoma, Norman, Oklahoma Abstract In this paper, we propose a design of a 7 Tesla magnetic resonance imaging (MRI) whole-body coil. We describe some important features of the coil, both from a mechanical and electromagnetic perspective. We show the results of optimizing the coils excitation sources in a near-field phased-array manner that minimizes the standard deviation ofthe circularly polarized component ofthe transverse magnetic field, which is responsible for exciting the spins, across various cross-sections of the human body. Successful optimizations of full cross-sectional slices of the body located in the coil, as well as optimizations useful for localized imaging of a particular organ (in this case chosen to be the liver), are provided. By demonstrating the dramatic improvement in the performance of this coil utilizing the proposed complex excitation system, we show that whole-body 7 Tesla coil is physically feasible as well as probable, demonstrating great potential for future clinical and research imaging applications. Introduction Magnetic resonance imaging has been a remarkable tool in allowing doctors to examine the interior of the human body with unprecedented clarity and precision. While MRI technology has made significant advancements since its birth in the late 1970s, many more improvements have yet to be made in order to