Coil extensions improve line shapes by removing field distortions
| Autor: | Andrew F. McDowell, Stephen A. Altobelli, Mark S. Conradi |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Nuclear and High Energy Physics Field (physics) Acoustics Biophysics Microcoil 010402 general chemistry Condensed Matter Physics 01 natural sciences Biochemistry Magnetic susceptibility 030218 nuclear medicine & medical imaging 0104 chemical sciences 03 medical and health sciences 0302 clinical medicine Electromagnetic coil Distortion Line (geometry) Scaling Radiofrequency coil |
| Zdroj: | Journal of magnetic resonance (San Diego, Calif. : 1997). 291 |
| ISSN: | 1096-0856 |
| Popis: | The static magnetic susceptibility of the rf coil can substantially distort the field B0 and be a dominant source of line broadening. A scaling argument shows that this may be a particular problem in microcoil NMR. We propose coil extensions to reduce the distortion. The actual rf coil is extended to a much longer overall length by abutted coil segments that do not carry rf current. The result is a long and nearly uniform sheath of copper wire, in terms of the static susceptibility. The line shape improvement is demonstrated at 43.9 MHz and in simulation calculations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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