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. Author manuscript; available in PMC: 2018 Jul 1.
Published in final edited form as: Magn Reson Med. 2016 Aug 8;78(1):387–398. doi: 10.1002/mrm.26339

Figure 2.

Figure 2

(a) Individualized restraining helmets with curved surface designed for the 8-channel external array. A 3D printed coil support with inner surface that matches the external curved surface of the helmets was used to build the external array. Because the coil support fits into different individualized restraint helmets with curved surface, the same coil can be used for different animals. (b) Top view of the external array showing the coil layout in a 2 × 4 configuration. (c) Picture of the external array with individual FR4 circuit boards for each channel, with the tuning/matching network and floating bazooka baluns for each element in the 8-channel embedded array. (d) Close up view of the coil elements showing the bent wires where the loops are overlapped in the region indicated by the solid box in (c). (e) 8-channel external array loaded with a phantom and connected to the 8-channel preamplifier box.