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  Analysis of RF transmit performance for a 7T dual row multichannel MRI loop array

Kozlov, M., & Turner, R. (2011). Analysis of RF transmit performance for a 7T dual row multichannel MRI loop array. In 33rd Annual International Conference of the IEEE EMBS.

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Kozlov, Mikhail1, Autor           
Turner, Robert1, Autor           
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1Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634550              

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Schlagwörter: Antenna arrays, Biomedical imaging, Computational electromagnetics
 Zusammenfassung: We present a numerical investigation of the RF fields generated inside a human head by single and dual-row loop arrays. For a uniform circular polarization (CP) mode excitation, a dual-row array has no advantage for human brain excitation. Significant improvement of B1+ homogeneity with a simultaneous increase of coverage in the axial direction can be obtained by using a dual-row array together with a static RF shim: that is, excitation of both rows separately in CP mode, while providing the upper row elements with a +90 phase shift relative to axially adjacent lower row elements. For this case the excitation efficiency over the entire brain remains practically unaffected, and the improved B1+ coverage results in a relatively smaller amount of power delivered to brain. To keep the mean B1+ across the brain equal to its value in a uniform CP excitation mode, a larger transmit power level is required. This results in a moderate increase of peak SAR10g. The location of peak SAR10g moves from the brain (uniform CP mode location) to the nose skin. The performance of dual-row arrays in transmit SENSE operation will be explored in future investigations.

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 Datum: 2011
 Publikationsstatus: Erschienen
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Veranstaltung

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Titel: 33rd Annual International Conference of the IEEE EMBS
Veranstaltungsort: Boston, MA, USA
Start-/Enddatum: 2011-08-30 - 2011-09-03

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Titel: 33rd Annual International Conference of the IEEE EMBS
Genre der Quelle: Konferenzband
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