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. 2014 Aug 21;7:34. doi: 10.3389/fneng.2014.00034

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Copyright © 2014 Xie, Martini, Hassler, Kirch, Stieglitz, Seifert and Hofmann.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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OCT images reveal that the signal of flexible microelectrode underneath the fiber catheter declined. (A) At 1 week, the flexible electrode can be seen distinctly in the OCT image with a approximately 12 dB peak height in the A-scan plot. (B) In contrast to the enhanced OCT signal of the brain tissue, the signal of the flexible electrode severely declined. (C) Interestingly, at 3 weeks p.i. the OCT image illustrates 2 distinguishable tissue layers. The backscattering intensity of the flexible electrode remains noticeable.