标准滤线栅便于形成在收集边缘提供高磁场和高梯度的要素，压降较低。
Standard grids have advantageously shaped elements to provide high magnetic field and gradient near collecting edges, while causing very low pressure drop.
结论：考虑病人的吸收剂量和避免影像失真，摄影焦-片距的选择应与滤线栅的焦距相匹配。
Conclusion: Considering the absorbed dose of the patients and avoiding the image distortion, it is suggested that the selection of focus-film distance should be matched with the tube and grid.
为快速、准确地检测X线滤线栅的对散射X线的吸收能力和使用效果，研制了游线材几何性能测试系统。
A computerize system for testing the geometrical performance of grids are developed for fast and precisely controlling medical X-ray grid ability for absorbing scattered ray and its utility effect.
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