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首页> 外文期刊>Medical Physics >Robust x-ray tubes for use within magnetic fields of MR scanners.
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Robust x-ray tubes for use within magnetic fields of MR scanners.

机译：坚固的X射线管，用于MR扫描仪的磁场。

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摘要

A hybrid system that combines an x-ray fluoroscopic system and a magnetic resonance (MR) system can provide physicians with the synergy of exquisite soft tissue contrast (from MR) and high temporal and spatial resolutions (from x ray), which may significantly benefit a number of image-guided interventional procedures. However, the system configuration may require the x-ray tube to be placed in a magnetic field, which can hinder the proper functioning of the x-ray tube by deflecting its electron beam. From knowledge of how the magnetic field affects the electron trajectories, we propose creating another magnetic field along the cathode-anode axis using either solenoids or permanent magnets to reduce the deflection of the electron beam for two cases: a strong and slightly misaligned field or a weak field that is arbitrary in direction. Theoretical analysis is presented and the electron beam is simulated in various external magnetic fields with a finite element modeling program. Results show that both correction schemes enhance the robustness of the x-ray tube operation in an externally applied magnetic field.
机译：结合了X射线荧光透视系统和磁共振（MR）系统的混合系统可以为医师提供精巧的软组织对比度（来自MR）和高时空分辨率（来自X射线）的协同作用，这可能会大大受益许多以图像为指导的介入程序。但是，系统配置可能需要将X射线管放置在磁场中，这可能会通过偏转X射线管的电子束而妨碍其正常工作。根据有关磁场如何影响电子轨迹的知识，我们建议使用螺线管或永磁体沿阴极-阳极轴创建另一个磁场，以在两种情况下减小电子束的偏转：强且略有偏移的场或在方向上是任意的弱场。进行了理论分析，并使用有限元建模程序在各种外部磁场中模拟了电子束。结果表明，两种校正方案都可以增强X射线管在外部施加的磁场中的鲁棒性。

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