Rotating magnets as spatial encodings for portable MRI applications
Shi, Yaokun
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https://hdl.handle.net/2142/125739
Description
Title
Rotating magnets as spatial encodings for portable MRI applications
Author(s)
Shi, Yaokun
Issue Date
2024-07-19
Director of Research (if dissertation) or Advisor (if thesis)
Haran, Kiruba S.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Low-field MRI
Abstract
Magnetic resonance imaging (MRI) has long been a preferred imaging technique due to its non-invasive nature and its ability to produce high-quality, multi-contrast images. While advancements in the field have typically focused on achieving higher field strengths for better image quality, traditional MRI devices require significant financial investment and high energy consumption for setup, operation, and maintenance. In contrast, low-field MRI devices offer a more cost-effective and energy-efficient alternative, but at the expense of image signal-to-noise ratio (SNR), which is crucial for clinical scans. This trade-off has historically hindered the development of low-field MRI. However, recent advancements in machine learning for image reconstruction and denoising have shown promising results in enhancing low-field MRI images, reigniting interest in this area.
This paper discusses the viability of a low-field, open-bore MRI device. To reduce the form factor, we implemented a novel magnetic field design based on permanent magnets and a set of custom radio-frequency coils for low operational frequencies. Furthermore, various accompanying signal acquisition, image reconstruction and image denoising techniques are discussed. We provide theoretical support and simulated results to demonstrate the potential of this design, and a prototype is assembled for preliminary testing. At the prototype's miniature scale, MRI can become a candidate for many urgent-care or on-scene imaging tasks, removing barriers to the technology.
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