document: Polarization of the RF field in a human head at high field : a study with a quadrature surface coil at 7.0 T The RF field intensity distribution in the human brain becomes inhomogeneous due to wave behavior at high field . This is further complicated by the spatial distribution of RF field polarization that must be considered to predict image intensity distribution . An additional layer of complexity is involved when a quadrature coil is used for transmission and reception . To study such complicated RF field behavior , a computer modeling method was employed to investigate the RF field of a quadrature surface coil at 300 MHz . Theoretical and experimental results for a phantom and the human head at 7.0 T are presented . The results are theoretically important and practically useful for high-field quadrature coil design and application
doc_bio_tags: O O O O O O O O O O O O O O O O O B I I O O O O B I I I O O B I O O O O O O O O O O O O O O O O B I O B I I O O O O O O B I I O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O O O O O B I I O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
extractive_keyphrases: rf field intensity distribution human brain rf field polarization quadrature surface coil spatial distribution image intensity distribution computer modeling 300 mhz
abstractive_keyphrases: high field mri high-field coil design whole-body mri phantom samples segmented images 3d multitissue head model gradient echo images finite difference time domain method maxwell wave equations reception fields transmission fields 7.0 t