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Open birdcage coil for head imaging at 7T.
Nikulin, Anton V; Vignaud, Alexandre; Avdievich, Nikolai I; Berrahou, Djamel; de Rosny, Julien; Ourir, Abdelwaheb.
Afiliación
  • Nikulin AV; Institut Langevin, ESPCI Paris, CNRS, PSL University, Paris, France.
  • Vignaud A; Université Paris-Saclay, CEA, CNRS, BAOBAB, NeuroSpin, Gif-sur-Yvette, France.
  • Avdievich NI; High-Field MR Center, Max Planck Institute for Biological Cybernetics, Tübingen, Germany.
  • Berrahou D; Multiwave Innovation SAS, Marseille, France.
  • de Rosny J; Institut Langevin, ESPCI Paris, CNRS, PSL University, Paris, France.
  • Ourir A; Institut Langevin, ESPCI Paris, CNRS, PSL University, Paris, France.
Magn Reson Med ; 86(4): 2290-2300, 2021 10.
Article en En | MEDLINE | ID: mdl-34080734
PURPOSE: To theoretically describe, design, and test the new geometry of the birdcage coil for 7 Tesla anatomical brain imaging, which includes a large window on top, without deliberately jeopardizing its homogeneity and efficiency. This opencage will not only improve patient comfort but also enable the volunteer to follow functional MRI stimuli. This design could also facilitate the tracking of patient compliance and enable better correction of the movement. METHODS: Via the transfer matrix approach, a birdcage-like coil with a nonperiodic distribution of rungs is constructed with optimized currents in the coil rungs. Subsequently, the coil is adjusted in full-wave simulations. Then, the coil is assembled, fine-tuned, and matched on the bench. Finally, these results are confirmed experimentally on a phantom and in vivo. RESULTS: Indeed, the computed isolation of -14.9 dB between the feeding ports of the coil and the symmetry of the circular polarized mode pattern transmit RF magnetic field ( B1+ ) showed that the coil was properly optimized. An experimental assessment of the developed coil showed competitive transmit efficiency and coverage compared with the conventional birdcage coil of similar size. CONCLUSION: The proposed opencage coil can be designed and work without a dramatic drop of performance in terms of the B1+ field homogeneity, transmit efficiency ( B1+ / Pref ), peak local specific absorption rate ( SAR10g ) and SAR efficiency ( B1+ / SAR10g ).
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Imagen por Resonancia Magnética / Cabeza Límite: Humans Idioma: En Revista: Magn Reson Med Asunto de la revista: DIAGNOSTICO POR IMAGEM Año: 2021 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Imagen por Resonancia Magnética / Cabeza Límite: Humans Idioma: En Revista: Magn Reson Med Asunto de la revista: DIAGNOSTICO POR IMAGEM Año: 2021 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Estados Unidos