新型人工電磁介質在磁共振成像中的應用研究
[Abstract]:The new artificial electromagnetic medium is a kind of artificial composite material which has some supernormal physical properties which are not possessed by some natural materials. The electromagnetic properties of artificial electromagnetic medium are mainly determined by the structure rather than the composition material. In recent decades, its applications in left-handed materials, perfect lenses, slow waves, electromagnetic devices and recessive materials have been studied in theory and experiment. Magnetic resonance imaging (MRI) technology has important applications in brain science, neurophysiology and cognitive neuroscience. In this paper, the application of artificial electromagnetic superlens with equivalent negative permeability in NMR medical imaging is studied. The main contents of this paper are as follows: firstly, the electromagnetic transmission characteristics of the basic open circuit resonant structure unit are studied. We propose a flat plate electromagnetic superlens based on the basic structure of the open loop inner closed loop outside the open loop resonance unit. By using the homogenization theory, the electromagnetic superlens with negative equivalent permeability is obtained. The high resolution detection and localization scanning imaging of tumor cells in human tissues are studied theoretically, and the potential application of plate electromagnetic superlens in medical imaging is pointed out. Secondly, we propose a curved cylindrical electromagnetic superlens structure based on a single open-loop resonant element and load a non-magnetic capacitance at the opening. The focusing characteristics of the superlens are discussed in depth. In clinical experiments, the device has a good focusing effect on the surface coil signal under the existing GE 1.5 T MRI system, and effectively improves the detection depth of the surface coil. At the same time, due to the bending structure of the electromagnetic superlens, we point out its application in super-resolution imaging, the device can effectively reduce the signal interference of various electromagnetic sources, so it can be used in the parallel imaging of MRI system. Due to the discrete characteristics of the structure of artificial electromagnetic medium superlens, the signal-to-noise ratio (SNR) of magnetic resonance imaging is weakened to a certain extent, and the structure will be optimized at the later stage. Finally, the paper summarizes the full text and puts forward the prospect of future research.
【學位授予單位】:浙江大學
【學位級別】:碩士
【學位授予年份】:2012
【分類號】:R445.2
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