...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Radiation oncology >Quality assurance of non-coplanar, volumetric-modulated arc therapy employing a C-arm linear accelerator, featuring continuous patient couch rotation
【24h】

Quality assurance of non-coplanar, volumetric-modulated arc therapy employing a C-arm linear accelerator, featuring continuous patient couch rotation

机译：采用C臂线性加速器的非共面，体积调制电弧疗法的质量保证，具有患者卧榻连续旋转的特点

获取原文
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

To perform quality assurance of non-coplanar, volumetric-modulated arc therapy featuring continuous couch rotation (CCR-VMAT) using a C-arm linear accelerator. We planned and delivered CCR-VMAT using the TrueBeam Developer Mode. Treatment plans were created for both a C-shaped phantom and five prostate cancer patients using seven CCR trajectories that lacked collisions; we used RayStation software (ver. 4.7) to this end. Subsequently, verification plans were generated. The mean absolute error (MAE) between the center of an MV-imaged steel ball and the radiation field was calculated using the Winston–Lutz test. The MAEs between planned and actual irradiation values were also calculated from trajectory logs. In addition, correlation coefficients (r values) among the MAEs of gantry angle, couch angle, and multi-leaf collimator (MLC) position, and mechanical parameters including gantry speed, couch speed, MLC speed, and beam output, were estimated. The dosimetric accuracies of planned and measured values were also assessed using ArcCHECK. The MAEs ±2 standard deviations as revealed by the Winston–Lutz test for all trajectories were 0.3?±?0.3?mm in two dimensions. The MAEs of the gantry, couch, and MLC positions calculated from all trajectory logs were within 0.04°, 0.08°, and 0.02?mm, respectively. Deviations in the couch angle (r?=?0.98, p??0.05) and MLC position (r?=?0.86, p??0.05) increased significantly with speed. The MAE of the beam output error was less than 0.01 MU. The mean gamma passing rate?±?2 SD (range) of the 3%/3?mm, 3%/1?mm, and 5%/1?mm was 98.1?±?1.9% (95.7–99.6%), 87.2?±?2.8% (80.2–96.7%), and 96.3?±?2.8% (93.9–99.6%), respectively. CCR-VMAT delivered via the TrueBeam Developer Mode was associated with high-level geometric and mechanical accuracy, thus affording to high dosimetric accuracy. The CCR-VMAT performance was stable regardless of the trajectory chosen.
机译：要使用C臂线性加速器进行具有连续卧榻旋转（CCR-VMAT）的非共面容积调制电弧疗法的质量保证。我们使用TrueBeam开发人员模式计划并交付了CCR-VMAT。使用七种没有碰撞的CCR轨迹为C形体模和五名前列腺癌患者制定了治疗计划。为此，我们使用了RayStation软件（4.7版）。随后，生成了验证计划。使用Winston-Lutz检验计算了MV成像钢球中心与辐射场之间的平均绝对误差（MAE）。还可以从轨迹记录中计算出计划辐射值与实际辐射值之间的MAE。另外，估计了机架角度，床架角度和多叶准直仪（MLC）位置的MAE之间的相关系数（r值），以及包括机架速度，床架速度，MLC速度和光束输出在内的机械参数。计划和测量值的剂量精确度也使用ArcCHECK进行了评估。由Winston-Lutz测试显示，所有轨迹的MAE±2标准偏差在两个维度上均为0.3？±？0.3？mm。根据所有轨迹测得的龙门架，床架和MLC位置的MAE分别在0.04°，0.08°和0.02？mm之内。横卧角的偏差（rα＝ 0.98，p ＜0.05）和MLC位置（r ＝ 0.86，p ＜0.05）随速度显着增加。光束输出误差的MAE小于0.01MU。 3％/ 3？mm，3％/ 1？mm和5％/ 1？mm的平均伽玛通过率？±？2 SD（范围）为98.1？±？1.9％（95.7–99.6％），分别为87.2±2.8％（80.2–96.7％）和96.3±2.8％（93.9–99.6％）。通过TrueBeam开发人员模式交付的CCR-VMAT具有较高的几何和机械精度，因此具有很高的剂量学精度。无论选择哪种轨迹，CCR-VMAT性能都是稳定的。

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号