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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 2. Array SNR normalized by the corresponding ultimate intrinsic SNR as a function of number of coils, for various main magnetic field strengths and voxel positions (r) inside a homogeneous sphere with 8.4 cm radius.

Figure 2

Ultimate intrinsic SNR can be approached closely with a sufficient number of coils for a voxel in the center of the sphere (a). Array performance with respect to the ultimate limits decreases for voxel positions closer to the surface of the sample (b, c). Including coil noise contributions to the array SNR further reduces performance with respect to the best possible SNR, especially for larger number of coils and lower main magnetic field strength (d–f). Note that the vertical axis limits are optimized for each plot.