A simple theory for vibration of MRI gradient coils
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Sociedade Brasileira de Física
2006
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| _version_ | 1876432784449339392 |
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| author | D. Tomasi |
| author_facet | D. Tomasi |
| contents | A simple theory for vibration of MRI gradient coils D. Tomasi T. Ernst Física, Astronomía y Matemáticas MRI MRI coils Vibrations of a string can provide a model for vibrations of MRI coil assemblies. The string model for thevibrations of MRI coils is presented, and compared with experimental results. Gradient coils exhibit resonantmodes because of the finite coil length, l, and the elasticity of materials that comprise the assembly. The resonancefrequencies depend on l and the Young modulus, as well as on the current distribution. Under longitudinalgradient pulses, anti-symmetrical modes of surface vibration are produced due to the symmetry of current distribution.In contrast, transverse gradient pulses produce coil bending that results in symmetrical vibration modesof the coil axis. The viscosity of the assembly materials controls the width of the vibrational resonance modes.Experimental results are in agreement with this simple string model. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46436108 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.1A Vol.36 |
| format | Artículo científico |
| id | redalyc_46436108 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | A simple theory for vibration of MRI gradient coils D. Tomasi Física, Astronomía y Matemáticas MRI MRI coils A simple theory for vibration of MRI gradient coils D. Tomasi T. Ernst Física, Astronomía y Matemáticas MRI MRI coils Vibrations of a string can provide a model for vibrations of MRI coil assemblies. The string model for thevibrations of MRI coils is presented, and compared with experimental results. Gradient coils exhibit resonantmodes because of the finite coil length, l, and the elasticity of materials that comprise the assembly. The resonancefrequencies depend on l and the Young modulus, as well as on the current distribution. Under longitudinalgradient pulses, anti-symmetrical modes of surface vibration are produced due to the symmetry of current distribution.In contrast, transverse gradient pulses produce coil bending that results in symmetrical vibration modesof the coil axis. The viscosity of the assembly materials controls the width of the vibrational resonance modes.Experimental results are in agreement with this simple string model. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46436108 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.1A Vol.36 |
| title | A simple theory for vibration of MRI gradient coils |
| topic | Física, Astronomía y Matemáticas MRI MRI coils |
| url | https://www.redalyc.org/articulo.oa?id=46436108 |