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相关概念视频

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

8.9K
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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Updated: Jan 9, 2026

Use of a Foot-Induced Digitally Controlled Resistance Device for Functional Magnetic Resonance Imaging Evaluation in Patients with Foot Paresis
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Use of a Foot-Induced Digitally Controlled Resistance Device for Functional Magnetic Resonance Imaging Evaluation in Patients with Foot Paresis

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一个高功率的矢量网络分析仪用于测试MRI传输硬件.

Jacob Ruff, John C Bosshard, Benjamin Malone

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    此摘要是机器生成的。

    一个新的系统在没有MRI扫描仪的情况下,以高功率 (1000W) 和高速度 (微秒) 进行射频 (RF) 组件的特征. 这使得在苛刻的操作条件下故障的射频设备的调试可行.

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    科学领域:

    • 工程 工程师 工程师 工程师
    • 物理 物理学 物理
    • 医学成像技术 医学成像技术

    背景情况:

    • 无线电频率 (RF) 组件的性能对于可靠的系统运行至关重要.
    • 使用矢量网络分析仪的标准测试方法在高功率条件下可能无法发现问题,例如磁共振 (MR) 成像.
    • 调试高功率射频组件故障是具有挑战性的,因为与MRI扫描仪相关的不切实际性和成本.

    研究的目的:

    • 开发和介绍一种用于特征射频元件的新系统.
    • 为了使高功率 (1000W) 和高速度 (微秒间隔) 的射频组件和系统的测试.
    • 为RF组件调试提供对MR扫描仪的实用和经济有效的替代方案.

    主要方法:

    • 开发一个专门的RF元件表征系统.
    • 实施高功率测试能力,高达1000W.
    • 在微秒间隔获得高速测量,用于S参数分析.

    主要成果:

    • 该系统成功地特征了单端口和双端口射频组件和系统.
    • 测量结果显示,在高功率水平下,部件出现故障 (完全或部分故障).
    • 展示了系统评估设备旋转速度的能力.

    结论:

    • 开发的系统为高功率,高速的射频组件表征提供了一个实用的解决方案.
    • 它有效地识别了标准方法无法检测到的条件下的性能问题和故障.
    • 这项技术有助于开发和验证射频组件,用于像MRI成像这样的苛刻应用.