Title: adrature Coil System for Simultaneous on of Magnetic Resonance Signals
Abstract: The magnetic field intensity of a flexible quadrature coil system for magnetic resonance imaging is modeled and simulated. The calculated signal to noise ratio of the coil system is verified experimentally using a coil constructed with the model's dimensions. It is found that flexing the coil over a thirty degree range preserves the high signal to noise ratio and increases the clinical utility of such a system. I. INTRODUCTIQN Simultaneous reception of magnetic resonance signals from a plurality of noninteracting coils has been shown to provide a high signal to noise ratio (SNR) and a large field of view (FOV) (l). Quadrature coils have been shown to increase SNR over linear coils of equivalent size (2). It is desirable in some applications to allow the coil structure to flex over the region of interest (ROI) to obtain high SNR. In this paper, we present an improved coil design which can interface to multichannel systems with a significant degree of flexibility while preserving the simultaneous reception and quadrature detection properties. 11. BACKGRQUND The nuclear magnetic resonance (NMR) system is a clinically useful tool in the medical diagnostic imaging industry. The phenomenon of NMR was first used as an analytical tool for spectral analysis of various nuclei. Today, NMR has demonstrated the ability to show the physiological state and vascularity of tissues throughout the human body. A clinical NMR system utilizes static and changing magnetic fields along with radio frequency energy to probe the properties of the Hydrogen atom. A RF pulse is applied to the human body in the presence of an extemal magnetic field. The Hydrogen protons absorb this energy and move to a higher energy state. When the pulse is removed, the protons return to their original energy state and give up transitional energy which is detected by a RF receiver coil. A RF receiver coil consist of a simple LC resonant circuit, designed to cover the area of interest and resonates at the transitional energy's frequency.
Publication Year: 1995
Publication Date: 1995-01-01
Language: en
Type: article
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