Robust x-ray tubes for use within magnetic fields of MR scanners.
Robust x-ray tubes for use within magnetic fields of MR scanners.
复制标题
适用于 MR 扫描仪磁场的坚固 X 射线管。
DOI：
10.1118/1.1944267
复制
发表时间：
2005
期刊：
影响因子：
3.8
通讯作者：
Pelc,NorbertJ
中科院分区：
文献类型：
--
作者：
Wen,Zhifei;Fahrig,Rebecca;Pelc,NorbertJ
结合X射线透视系统和磁共振（MR）系统的混合系统可以为医生提供精致的软组织对比度（来自MR）和高时间和空间分辨率（来自X射线）的协同作用，这可能会显着受益于许多图像引导介入手术。但是，系统配置可能需要将X射线管放置在磁场中，这可能会通过偏转其电子束而阻碍X射线管的正常功能。从磁场如何影响电子轨迹的知识，我们建议创建另一个磁场沿着阴极-阳极轴使用永磁体或永磁体，以减少偏转的电子束的两种情况下：一个强大的和轻微错位的字段或弱场是任意的方向。理论分析和电子束在不同的外部磁场与有限元模拟程序。结果表明，两种校正方案均增强了X射线管在外部施加磁场中运行的鲁棒性。
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.