Design of Phased Array and Multiple Coil Probes for High Frequency Magnetic Resonance Microscopy and Spectroscopy
Zhang, Xiaozhong
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https://hdl.handle.net/2142/80866
Description
Title
Design of Phased Array and Multiple Coil Probes for High Frequency Magnetic Resonance Microscopy and Spectroscopy
Author(s)
Zhang, Xiaozhong
Issue Date
2004
Doctoral Committee Chair(s)
Andrew G. Webb
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Language
eng
Abstract
In terms of magnetic resonance imaging, recent developments in the field of phased array coils have also been used to increase sensitivity. Typically, such an arrangement requires a homogeneous transmit coil, with the array being used only for signal reception. In this thesis a more flexible arrangement has been designed, in which a four-coil transmit/receive system has been designed for microimaging studies at 200 MHz. This design also removes the requirement for specialized preamplifiers that are normally integrated into phased arrays. At high frequencies, for imaging samples with large volume, e.g., mice and plants, phased array technology is particularly suitable to increase the SNR, compared with conventional probe designs. A transmit-receive phased array probe has been designed for imaging studies at 600 MHz, with a balanced coil configuration and low-loss capacitive decoupling. MRI samples with a large length-to-diameter ratio, such as plant stems, can be imaged with high SNR. A 600-MHz surface phased array probe has been designed to work with a large transmit coil for MRI experiments of samples where high localized resolution is desired, such as spinal cord imaging in mice. This probe is also suitable for studies of organs such as the heart.
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