PUBLICATION
High Q calcium titanate cylindrical dielectric resonators for magnetic resonance microimaging
- Authors
- Haines, K., Neuberger, T., Lanagan, M., Semouchkina, E., and Webb, A.G.
- ID
- ZDB-PUB-090807-20
- Date
- 2009
- Source
- Journal of magnetic resonance (San Diego, Calif. : 1997) 200(2): 349-353 (Journal)
- Registered Authors
- Webb, Ashley
- Keywords
- Dielectric, Ceramic, High frequency resonator, Microimaging
- MeSH Terms
-
- Calcium Compounds*
- Equipment Design
- Equipment Failure Analysis
- Image Enhancement/instrumentation*
- Magnetic Resonance Imaging/methods*
- Magnetics/instrumentation*
- Oxides*
- Phantoms, Imaging
- Sensitivity and Specificity
- Titanium*
- Transducers*
- PubMed
- 19656696 Full text @ J. Magn. Reson.
Citation
Haines, K., Neuberger, T., Lanagan, M., Semouchkina, E., and Webb, A.G. (2009) High Q calcium titanate cylindrical dielectric resonators for magnetic resonance microimaging. Journal of magnetic resonance (San Diego, Calif. : 1997). 200(2):349-353.
Abstract
At high magnetic fields radiation losses, wavelength effects, self-resonance, and the high resistance of typical components all contribute to increased losses in conventional RF coil designs. High permittivity ceramic dielectric resonators create strong uniform magnetic fields in a compact structure at high frequencies and can potentially solve some of the challenges of high field coil design. In this study an NMR probe was constructed for operation at 600MHz (14.1T) using an inductively fed CaTiO(3) (relative permittivity of 156) cylindrical hollow bore dielectric resonator. The design has an unmatched Q value greater than 2000, and the electric field is largely confined to the dielectric itself, with near zero values in the hollow bore which accommodates the sample. Experimental and simulation mapping of the RF field show good agreement, with the ceramic resonator giving a pulse width approximately 25% less than a loop gap resonator of similar inner dimensions. High resolution images, with voxel dimensions less than 50mum(3), have been acquired from fixed zebrafish samples, showing excellent delineation of several fine structures.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping