焦片距
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镜片焦距 Lens F number ; mm
单片多焦距结构 one-piece multifocal construction
焦点-胶片距离 focus-to-film distance
焦一片距 Focus-to-film distance ; FFD
Focal pitch
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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.
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