In magnetic resonance imaging, the use of array detection and the number of detector elements have seen a steady increase over the past two decades. As a result, per-channel analog connection via long coaxial cable, as commonly used, poses an increasing challenge in terms of handling, safety, and coupling among cables. This situation is exacerbated when complementary recording of radiofrequency transmission or NMR-based magnetic field sensing further add to channel counts. A generic way of addressing this trend is the transition to digital signal transmission, enabled by digitization and first-level digital processing close to detector coils and sensors in the magnet bore. The foremost challenge that comes with this approach is to achieve high dynamic range, linearity, and phase stability despite interference by strong static, audiofrequency, and radiofrequency fields. The present work reports implementation of a 16-channel in-bore receiver, performing signal digitization and processing with subsequent optical transmission over fiber. Along with descriptions of the system design and construction, performance evaluation is reported. The resulting device is fully MRI compatible providing practically equal performance and signal quality compared to state-of-the-art RF digitizers operating outside the magnet. Its use is demonstrated by examples of head imaging and magnetic field recording.

中文翻译：

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磁共振成像的内孔接收器。

在磁共振成像中，在过去的二十年中，阵列检测的使用和检测器元件的数量一直稳定增长。结果，通常通过长同轴电缆进行的每通道模拟连接在处理，安全性和电缆之间的耦合方面提出了越来越大的挑战。当射频传输或基于NMR的磁场感应的补充记录进一步增加通道数时，这种情况会加剧。解决此趋势的通用方法是向数字信号传输过渡，方法是通过数字化和接近磁体孔中检测线圈和传感器的第一级数字处理来实现。这种方法面临的首要挑战是，尽管受到强大的静态，音频，和射频场。本工作报告了16通道孔内接收器的实现，执行信号数字化和处理，以及随后的光纤传输。连同对系统设计和构造的描述一起，报告了性能评估。所产生的设备与MRI完全兼容，与在磁体外部运行的最新RF数字化仪相比，可提供几乎相同的性能和信号质量。头部成像和磁场记录的例子证明了它的使用。所产生的设备与MRI完全兼容，与在磁体外部运行的最新RF数字化仪相比，可提供几乎相同的性能和信号质量。头部成像和磁场记录的例子证明了它的使用。所产生的设备与MRI完全兼容，与在磁体外部运行的最新RF数字化仪相比，可提供几乎相同的性能和信号质量。头部成像和磁场记录的例子证明了它的使用。