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• W2170216891 abstract "Abstract A major problem in the development of high field (>100 MHz) large volume (>6000 cm 3 ) MR coils is the interaction of the coil with the subject as well as the radiation loss to the environment. To reduce subject perturbation of the coil resonance modes, a volume coil that uses an array of freely rotating resonant elements radially mounted between two concentric cylinders was designed for operation at 170 MHz. Substantial electromagnetic energy is stored in the resonant elements outside the sample region without compromising the efficiency of the overall coil. This stored energy reduces the effect of the subject on the circuit and maintains a high Q , facilitating the tuning and matching of the coil. The unloaded Q of the coil is 680; when loaded with a head, it was 129. The ratio of 5.3 of the unloaded to loaded Q supports the notion that the efficiency of the coil was maintained in comparison with previous designs. The power requirement and signal‐to‐noise performance are significantly improved. The coil is tuned by a mechanism that imparts the same degree of rotation on all of the elements simultaneously, varying their degree of mutual coupling and preserving the overall coil symmetry. A thin radiofrequency shield is an integral part of the coil to reduce the radiation effect, which is a significant loss mechanism at high fields. MR images were collected at 4T using this coil design with high sensitivity and B 1 , homogeneity." @default.
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• W2170216891 date "1994-10-01" @default.
• W2170216891 modified "2023-09-29" @default.
• W2170216891 title "The design and test of a new volume coil for high field imaging" @default.
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• W2170216891 doi "https://doi.org/10.1002/mrm.1910320411" @default.
• W2170216891 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2890274" @default.
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