Spherical harmonic inductive detection coils for dynamic pre-emphasis
| Autor: | Karl Edler, David I. Hoult |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Physics
Acoustics Transducers Reproducibility of Results Spherical harmonics Shim (magnetism) Equipment Design Magnetic field gradient Image Enhancement Magnetic Resonance Imaging Sensitivity and Specificity Magnetic field law.invention Equipment Failure Analysis Magnetics Nuclear magnetic resonance law Electromagnetic coil Rise time Eddy current Computer-Aided Design Radiology Nuclear Medicine and imaging |
| Zdroj: | Magnetic Resonance in Medicine. 60:277-287 |
| ISSN: | 1522-2594 0740-3194 |
| DOI: | 10.1002/mrm.21693 |
| Popis: | The issue of eddy currents induced by the rapid switching of magnetic field gradients is a long-standing problem. A new method for dealing with this problem is presented whereby spatial harmonic components of the magnetic field are continuously sensed, through their temporal rates of change, and corrected. In this way, the effects of the eddy currents on the magnetic field can be detected and correction currents applied to the appropriate gradient or shim coils in a time much less than the rise time of the gradients. This new methodology has the potential to dynamically shape eddy current corrections for multiple spatial harmonic components of the field. Magn Reson Med 60:277–287, 2008. © 2008 Wiley-Liss, Inc. |
| Databáze: | OpenAIRE |
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