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Performance of large-size superconducting coil in 0.21T MRI system
1Jockey Club MRI Engineering Center, University of Hong Kong, Hong Kong, China. leekarhof@hotmail.com
IEEE Transactions on Bio-Medical Engineering
|November 13, 2004
Summary
Large high-temperature superconductor (HTS) coils significantly improve magnetic resonance imaging (MRI) quality by increasing the field of view (FOV). These HTS coils offer substantial signal-to-noise ratio (SNR) gains over traditional copper coils for various human body parts.
Area of Science:
- Medical Imaging Physics
- Materials Science
- Superconductivity Applications
Background:
- High-temperature superconductors (HTS) possess low electrical resistivity, making them suitable for enhancing magnetic resonance imaging (MRI) receiver coils.
- Conventional HTS coils, typically surface coils, have limited fields of view (FOV), restricting their use to small samples or peripheral human anatomies.
- Image quality improvements with HTS coils diminish as the ratio of sample noise to coil noise increases, further limiting their application.
Purpose of the Study:
- To evaluate the performance of large-size HTS coils in enhancing the FOV for improved MRI.
- To compare the signal-to-noise ratio (SNR) and sensitivity profiles of large HTS coils against copper and cooled copper coils.
- To demonstrate the clinical utility of large HTS coils in human imaging of various body parts.
Main Methods:
- Fabrication and utilization of large-size HTS coils with mean diameters of 2.5, 3.5, and 5.5 inches.
- Performance evaluation using phantom and human MRI scans, comparing HTS coils with copper and cooled copper surface coils.
- Theoretical modeling to predict and validate experimental results for SNR and sensitivity profiles.
Main Results:
- Large HTS coils demonstrated significant SNR gains: 250% for 2.5- and 3.5-inch coils, and 200% for the 5.5-inch coil, compared to same-sized copper coils.
- The enhanced FOV of large HTS coils was validated through phantom and human imaging of the wrist, feet, and head.
- Factors influencing large HTS coil performance, such as coil-to-sample spacing and coil-loading effects, were analyzed.
Conclusions:
- Large-size HTS coils effectively expand the FOV and substantially improve MRI SNR, overcoming limitations of smaller conventional HTS coils.
- HTS coils offer a significant advantage over copper coils for human imaging, enabling better visualization of various anatomical regions.
- Further research into optimizing coil design and mitigating performance-affecting factors is crucial for broader clinical adoption of large HTS coils.