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- W1963500154 abstract "This study proposes a method to empirically minimize mutual inductance, using passive end-ring circular paddles, with neighboring coil loops placed in a non-overlapped configuration. The proposed concepts are validated through B1-field simulations for resonant coils at fo = 300.5 MHz, having various sizes (3–10 cm), and for paddles with sizes ranging from 16 to 30 mm, and bench tests on constructed 4 × 4 cm2 two- (1 × 2) and four-coil loop (2 × 2) planar arrays. Simulation results yield total mean percentage B1-field differences of only 7.03% between the two non-overlapping coil array configurations (paddles vs. no-paddles). Pair-wise comparisons of elicited mean B1-field differences from the use of different circular and rectangular paddle sizes, yield values <5.3%. Theoretical calculation of the normalized mutual coupling coefficient in the non-overlapped coil configuration reduces to almost zero with optimally sized-paddles having a radius of approximately 28% the coil’s largest dimension. In the absence of paddles, differences in the split of resonance peaks of 9.9 MHz were observed for the two coils in the 1 × 2 array, which vanished with paddle placement. Single coil responses (unloaded/loaded) without paddles, and responses from array coils with use of optimally-sized paddles yielded quality factor ratios that ranged between 1.1–1.86 and 1.0–1.5, respectively. Phantom and mouse loaded reflection coefficients S11/S22 were −16.7/−16.2 dB and −28.2/−16.1 dB, for the two array loops, respectively. Under unloaded conditions and in the absence of paddles, split resonances were observed for the 1 × 2 array, yielding transmission coefficients of −5.5 to −8.1 dB, reversing to single resonance responses upon paddle placements, with transmission coefficients of −14.4 to −15.6 dB." @default.
- W1963500154 created "2016-06-24" @default.
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- W1963500154 date "2012-09-01" @default.
- W1963500154 modified "2023-09-28" @default.
- W1963500154 title "Elimination of mutual inductance in NMR phased arrays: The paddle design revisited" @default.
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- W1963500154 doi "https://doi.org/10.1016/j.jmr.2012.06.005" @default.
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