Improvements in magnetic field intensity and uniformity for small-animal MRI through a high-permittivity material attachment
- Authors
- Seo, J. -H.; Han, S. -D.; Kim, K. -N.
- Issue Date
- 26-May-2016
- Publisher
- INST ENGINEERING TECHNOLOGY-IET
- Citation
- ELECTRONICS LETTERS, v.52, no.11, pp.898 - 899
- Journal Title
- ELECTRONICS LETTERS
- Volume
- 52
- Number
- 11
- Start Page
- 898
- End Page
- 899
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/8278
- DOI
- 10.1049/el.2016.0638
- ISSN
- 0013-5194
- Abstract
- The ultra-high field (UHF) small-animal MRI (sa-MRI) device provides a powerful platform for translational imaging. To achieve a high signal-to-noise ratio, as well as sufficient signal homogeneity in abdominal imaging, the RF coil has to be precisely tuned. A novel geometry for a high-permittivity material (HPM) was designed and integrated into an enlarged (90 mm) birdcage (BC) RF coil. The geometrical design of the HPM attachment was based on a computational calculation, and was compared with the commonly used 72 mm bandpass filter BC coil without any HPM attachments. The resulting RF transmission (vertical bar B-1(+)vertical bar) map clearly shows that the increased coil diameter led to a decreased vertical bar B-1(+)vertical bar intensity. However, this loss in field intensity was mitigated by optimally integrating the HPM attachment with the coil. As a result of this attachment, the proposed design exhibits superior vertical bar B-1(+)vertical bar intensity and uniformity along the main magnetic field z-direction.
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