动态楔形板和物理楔形板对射线深度剂量与射野外周边剂量的影响

The influence to present depth doses and peripheral doses by enhanced dynamic wedge and physical wedge

目的:探讨动态楔形板和物理楔形板对射线深度剂量与射野外周边剂量的影响。方法:利用电离室法测量平野、动态楔形野、物理楔形野的深度剂量和射野外周边剂量。结果:动态楔形野的深度剂量和射野外周边剂量接近于平野的深度剂量和射野外周边剂量;而物理楔形野的深度剂量和射野外周边剂量高于平野的深度剂量和射野外周边剂量。结论:剂量计算时,动态楔形野可以利用平野的深度剂量,而物理楔形野需采用楔形深度剂量;使用物理楔形板时应注意相邻野或野外敏感器官的受量。

Purpose: To understand the influence to depth doses and peripheral doses by Enhanced Dynamic Wedge and physical wedge.Methods: The depth doses and peripheral doses were measurement for open field and Enhanced Dynamic Wedge field as well as physical wedge.Results: (1) depth doses and peripheral doses for Enhanced Dynamic Wedge fields was very similar to those for open fields; (2) depth doses and peripheral doses for physical wedge fields was large than those for open fields. Conclusion: depth doses measured for open fields can also be used for Enhanced Dynamic Wedge fields dose calculation. Wedge depth dose must be used in the physical wedge fields dose calculation. It should be pay attend to peripheral doses for physical wedge fields in the clinic.