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- W2079561024 abstract "The theory and application of array coils are reviewed in the context of phased array spectroscopy. The optimization of the signal-to-noise ratio from an array of coils is developed by considering the efficiency of a phased array transmit coil. This approach avoids the need to consider noise correlation, and should be useful in future considerations of transmit phased array coils for MR spectroscopy. Methods to characterize array coil performance, including fields and coupling are briefly summarized, along with methods to minimize the effects of mutual inductance. The signal-to-noise advantages of array coils over single coils are examined for both planar and cylindrical arrays. Numerical simulations of planar arrays of 2×2, 4×4 and 8×8 elements and constant overall dimension are compared to a single coil of the same size. The results demonstrate a significant improvement in sensitivity near the array coil. Although the benefits of the array decrease as a function of distance from the array, the array sensitivity never drops below that of a single coil with the same overall dimensions, or that of a single element of the array. Similar results are obtained for a sixteen element cylindrical array, which is compared to a standard quadrature birdcage coil using both computational methods and phantom measurements. The phased array techniques reviewed are demonstrated with proton spectroscopic images of the brain. © 1997 John Wiley & Sons, Ltd." @default.
- W2079561024 created "2016-06-24" @default.
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- W2079561024 date "1997-12-01" @default.
- W2079561024 modified "2023-10-12" @default.
- W2079561024 title "Theory and application of array coils in MR spectroscopy" @default.
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- W2079561024 doi "https://doi.org/10.1002/(sici)1099-1492(199712)10:8<394::aid-nbm494>3.0.co;2-0" @default.
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