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动态楔形
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  dynamic wedge
     Methods: The depth doses and peripheral doses were measurement for open field and Enhanced Dynamic Wedge field as well as physical wedge.
     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。
短句来源
     Results: (1) depth doses and peripheral doses for Enhanced Dynamic Wedge fields was very similar to those for open fields;
     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;
短句来源
     Conclusion: depth doses measured for open fields can also be used for Enhanced Dynamic Wedge fields dose calculation.
     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;
短句来源
     This system has been used to acquire a 3dimension dosage distribution of dynamic wedge modulator and the transient process of beam dosage.
     利用本系统的实时性,在国内首次实现了放疗加速器动态楔形剂量分布和束流过渡过程的测量。
短句来源
  “动态楔形”译为未确定词的双语例句
     In off axis fields formed by the upper independent jaws,only the EDWFs of 60 degree had the tendency to increase when the field center moved toward the toe of the wedge,the rest gave the opposite results.
     对于仅由上叶独立准直器非对称而形成的离轴方野 ,6 0°动态楔形野中心轴线上楔形因子随照射野中心位置坐标增大而增大 ,而其余的则都减小 ;
短句来源
  相似匹配句对
     DynamicState
     动态
短句来源
     DYNAMIC
     动态
短句来源
     Characteristics of wedge factor of an enhanced dynamic wedge on Varian 600C accelerator
     瓦里安加速器扩充型动态楔形楔形因子特性研究
短句来源
     Zero-Point Determination of Dynamic Angle Measurement with Grating Wedge-Plate Interferometer
     光栅楔形平板干涉法动态角度测量系统零点的确定
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  dynamic wedge
This sequence of contractional and extensional deformative events permits a tectonic interpretation in the framework of the dynamic wedge theory based on the evolution in the time of the stress configuration applied to a portion of the crust.
      
Calculation of enhanced dynamic wedge factors for symmetric and asymmetric photon fields, Med.
      
The current Varian implementation is entitled enhanced dynamic wedge, or EDW.
      
With this study it is intended to understand the physical aspects of radiation field when modulated by a dynamic wedge.
      


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...

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.

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。

This paper describes a realtime beam profile imaging system for actinotheraphy accelerator. With the flash Xray imager and the technique of digital image processing, a realtime 3demension dosage image is created from the intensity profile of the accelerator beam in real time. This system helps to obtain all the physical characters of the beam in any section plane, such as FWHM, penumbra, peak value, symmetry and homogeneity. This system has been used to acquire a 3dimension dosage distribution of dynamic...

This paper describes a realtime beam profile imaging system for actinotheraphy accelerator. With the flash Xray imager and the technique of digital image processing, a realtime 3demension dosage image is created from the intensity profile of the accelerator beam in real time. This system helps to obtain all the physical characters of the beam in any section plane, such as FWHM, penumbra, peak value, symmetry and homogeneity. This system has been used to acquire a 3dimension dosage distribution of dynamic wedge modulator and the transient process of beam dosage. The system configure and the tested beam profile images are also presented.

介绍了一种放疗加速器束流剂量实时成像系统,采用数字化脉冲X射线成像技术获取放疗加速器的束流强度分布图像,并利用数字图像处理技术生成实时3D剂量图。利用该系统可以实时、直观地获得加速器束流强度的相对分布曲面,给出任意剖面的束流强度分布曲线和FWHM、半影、峰值、对称度、均整度等参数。利用本系统的实时性,在国内首次实现了放疗加速器动态楔形剂量分布和束流过渡过程的测量。给出了系统配置和实测的放疗加速器束流强度分布图像。

ObjectiveTo study the characteristics of wedge factor of enhanced dynamic wedge (EDW) on Varian 600C linear accelerator . MethodsEnhanced dynamic wedge factors (EDWFs) of different jaw settings were measured on a Varian 600C linear accelerator with FARMER 2570 dosimeter and 2571 0.6 ml Thimble ion chamber. At the same time,equations were used to compute EDWFs of symmetric and asymmetric fields and off axis points. The same measurements were carried out on 30 degree physical wedge in contrast to EDW. The accelerator's...

ObjectiveTo study the characteristics of wedge factor of enhanced dynamic wedge (EDW) on Varian 600C linear accelerator . MethodsEnhanced dynamic wedge factors (EDWFs) of different jaw settings were measured on a Varian 600C linear accelerator with FARMER 2570 dosimeter and 2571 0.6 ml Thimble ion chamber. At the same time,equations were used to compute EDWFs of symmetric and asymmetric fields and off axis points. The same measurements were carried out on 30 degree physical wedge in contrast to EDW. The accelerator's jaw position was described according to IEC radiotherapy equipment coordinate standard. Results The EDWFs of symmetric field decreased smoothly while the field size increased. Under the same field,EDWFs decreased as the wedge angle increased and the increasing extent became apparent when the field became larger. In off axis fields formed by the upper independent jaws,only the EDWFs of 60 degree had the tendency to increase when the field center moved toward the toe of the wedge,the rest gave the opposite results. The EDWFs of fixed points varied only by 0.5 percent when the fixed jaw remained at the same place and the moving jaw and lower jaws stayed at different positions. But the WF of 30 degree physical wedge increased by 2.9 percent when the lower jaw settings increased from 4 cm to 40 cm. The EDWFs derived from analytic equations for symmetric and asymmetric fields coincided well with measured results. But at off-axis points,the differences between calculated values and measured data were apparent. ConclusionsThe curve of EDWF versus field size is very smooth. The EDWF of fixed point only depends on the position of the stationary upper jaw,and is affected little by the moving upper jaw and lower jaws. The EDWFs of off axis fields are much more complex than those of physical wedge; it shouldn't be confused in clinical application. The conversion method of rectangular field to square field is of no use when EDW field is confronted. Analytic methods are highly conformal with the calculation of EDWFs of symmetric and asymmetric fields.

目的 探讨瓦里安扩充型动态楔形板 (EDW )楔形因子的特性。方法 对瓦里安 6 0 0C直线加速器 6MVX射线 ,用砝玛 2 5 70剂量仪和 2 5 71指形电离室对不同的挡块设置情况下EDW的楔形因子进行测量 ,同时应用文献中给出的方程进行计算 ,将二者的结果进行对比分析。结果 同一EDW下对称照射野的楔形因子随照射野的增大而平滑减小 ,对于同一照射野 ,楔形因子随楔形板角度的增大而减小 ,减小幅度随照射野的增大而增大。楔形因子的离轴分布与物理楔形板的相似 ,呈近似指数变化。对于仅由上叶独立准直器非对称而形成的离轴方野 ,6 0°动态楔形野中心轴线上楔形因子随照射野中心位置坐标增大而增大 ,而其余的则都减小 ;同一EDW下 ,同一位置的楔形因子随照射野的增大而减小。对于固定的测量点 ,EDW的楔形因子与运动挡块的初始位置无关。楔形因子与下挡块开放大小无关。除楔形因子的离轴分布的计算值与实测值差异略大外 ,对称和离轴方野中心轴线上的楔形因子的符合性较好。结论 瓦里安加速器EDW楔形因子呈平滑变化 ;固定点的楔形因子只与固定挡块的位置有关 ,与运动挡块初始位置和下叶挡块开放大小无关...

目的 探讨瓦里安扩充型动态楔形板 (EDW )楔形因子的特性。方法 对瓦里安 6 0 0C直线加速器 6MVX射线 ,用砝玛 2 5 70剂量仪和 2 5 71指形电离室对不同的挡块设置情况下EDW的楔形因子进行测量 ,同时应用文献中给出的方程进行计算 ,将二者的结果进行对比分析。结果 同一EDW下对称照射野的楔形因子随照射野的增大而平滑减小 ,对于同一照射野 ,楔形因子随楔形板角度的增大而减小 ,减小幅度随照射野的增大而增大。楔形因子的离轴分布与物理楔形板的相似 ,呈近似指数变化。对于仅由上叶独立准直器非对称而形成的离轴方野 ,6 0°动态楔形野中心轴线上楔形因子随照射野中心位置坐标增大而增大 ,而其余的则都减小 ;同一EDW下 ,同一位置的楔形因子随照射野的增大而减小。对于固定的测量点 ,EDW的楔形因子与运动挡块的初始位置无关。楔形因子与下挡块开放大小无关。除楔形因子的离轴分布的计算值与实测值差异略大外 ,对称和离轴方野中心轴线上的楔形因子的符合性较好。结论 瓦里安加速器EDW楔形因子呈平滑变化 ;固定点的楔形因子只与固定挡块的位置有关 ,与运动挡块初始位置和下叶挡块开放大小无关 ;离轴方野楔形因子分布较为复杂 ,在临床使用中应谨慎 ,切忌与物理楔形板相混淆 ,对于物理楔形板适用的等效方野

 
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