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相关概念视频

Magnetic Resonance Imaging01:24

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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MRDust:通过磁共振图像调制实现无线植入器数据上传和定位.

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    科学领域:

    • 生物医学工程 生物医学工程
    • 医疗成像医学成像
    • 传感器技术 传感器技术

    背景情况:

    • 磁共振成像 (MRI) 提供了丰富的对比度,但受到核磁共振 (NMR) 物理学的限制,影响了灵敏度和分辨率.
    • 微型植入式传感器提供局部化的生理数据,但面临通信和局部化挑战,特别是多个植入物.

    研究的目的:

    • 推出MRDust,一种活跃的"对比剂",可以将活跃的传感器植入物与MRI相结合.
    • 为了使高度局部化的生理数据直接编码到MRI图像中,增强解剖信息.
    • 通过多个植入物来证明同时进行数据通信,本地化和图像注册.

    主要方法:

    • MRDust使用微米尺度的芯片上线圈来积极调节当地的磁场.
    • 这种调制使得MR信号的振幅和相调可以用于数字数据传输.
    • 一个 900 × 990 μm2 的芯片,其芯片上的线圈直径为 630 μm,在 3T MRI 扫描仪中设计和测试了使用 Spin-Echo Echo-Planar-Imaging (SE-EPI) 序列的芯片.

    主要成果:

    • 证明了成功的声音振幅调制,将数字数据编码到MRI图像中.
    • 实现了25.58.5的对比度与噪声比率 (CNR).
    • 该设备的低功耗为130微瓦.

    结论:

    • MRDust成功地将主动传感器植入物与MRI集成,使局部生理数据的直接编码成为可能.
    • 该技术具有与多个植入物同时进行数据通信,本地化和图像注册的潜力.
    • 这种方法克服了传统的MRI和植入式传感器的局限性,为先进的医学诊断铺平了道路.