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. Author manuscript; available in PMC: 2015 Jun 17.
Published in final edited form as: Concepts Magn Reson Part B Magn Reson Eng. 2015 Mar 23;44(3):53–65. doi: 10.1002/cmr.b.21268

Figure 3. Array SNR normalized by the corresponding ultimate intrinsic SNR for a voxel in the center of a uniform spherical phantom (r = 0) as a function of number of coils, for different main magnetic field strength and sample size.

Figure 3

SNR performance at 1.5 T and 3 T is almost unchanged for different sphere radii (a–c). SNR performance at 7 T and 9.4 T increases as the size of the phantom decreases and it is not significantly affected by the inclusion of coil noise in the SNR calculation (d–f). At 1.5 T and 3 T, coil noise significantly affects performance and becomes more dominant as the number of coils increases (d, e). However, when the sphere size is large, sample noise is higher and dominates even at 1.5 T and 3 T (f).