Commissioning and quality assurance of Dynamic WaveArc irradiation.
Commissioning and quality assurance of Dynamic WaveArc irradiation.
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DOI：
10.1120/jacmp.v16i2.5080
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发表时间：
2015-03-08
影响因子：
2.1
通讯作者：
Hiraoka M
中科院分区：
文献类型：
--
作者：
Sato S;Miyabe Y;Takahashi K;Yamada M;Nakamura M;Ishihara Y;Yokota K;Kaneko S;Mizowaki T;Monzen H;Hiraoka M
在Vero4DRT中实现了一种新的三维单手照射技术“Dynamic waveearc”（DWA），该技术在剂量传递过程中采用同步和连续的龙门架和O环旋转。本研究的目的是制定DWA辐照的调试和质量保证程序，并评估Vero4DRT机械运动和剂量学控制的准确性。为了确定DWA辐照的机械精度和剂量精度，生成了21种不同龙门架和环旋转方向和速度的验证试验图。在记录辐照测井数据的同时对这些图案进行辐照。评估每个时间点日志中计划值与实际值在龙门位置、环位置和累积MU（分别为和）上的差异。此外，使用电离室和球形幻影测量了释放的剂量。通过与静态光束辐照的比较，考察了DWA辐照过程中辐射输出的稳定性。的平均绝对误差（MAE）在0.1°以内，最大误差在0.2°以内。的MAE在0.7 MU以内，最大误差为2.7 MU。累积MU误差仅在控制点、变化的龙门架和环速度周围观察到。大于或等于2.0 MU的龙门转动幅度不大于3.2%。结果表明，在整个辐照范围内，累积MU的较大差异的程度可以忽略不计。DWA辐照的相对输出值变化在0.2%以内，与旋转龙门的常规电弧辐照相当。最后，设计并实现了DWA辐照的验证程序。结果表明，Vero4DRT在龙门和环旋转过程中具有足够的机械精度和梁输出常数。PACS号码：87
A novel three‐dimensional unicursal irradiation technique “Dynamic WaveArc” (DWA), which employs simultaneous and continuous gantry and O‐ring rotation during dose delivery, has been implemented in Vero4DRT. The purposes of this study were to develop a commissioning and quality assurance procedure for DWA irradiation, and to assess the accuracy of the mechanical motion and dosimetric control of Vero4DRT. To determine the mechanical accuracy and the dose accuracy with DWA irradiation, 21 verification test patterns with various gantry and ring rotational directions and speeds were generated. These patterns were irradiated while recording the irradiation log data. The differences in gantry position, ring position, and accumulated MU (, and , respectively) between the planned and actual values in the log at each time point were evaluated. Furthermore, the doses delivered were measured using an ionization chamber and spherical phantom. The constancy of radiation output during DWA irradiation was examined by comparison with static beam irradiation. The mean absolute error (MAE) of and were within 0.1° and the maximum error was within 0.2°. The MAE of was within 0.7 MU, and maximum error was 2.7 MU. Errors of accumulated MU were observed only around control points, changing gantry, and ring velocity. The gantry rotational range, in which was greater than or equal to 2.0 MU, was not greater than 3.2%. It was confirmed that the extent of the large differences in accumulated MU was negligibly small during the entire irradiation range. The variation of relative output value for DWA irradiation was within 0.2%, and this was equivalent to conventional arc irradiation with a rotating gantry. In conclusion, a verification procedure for DWA irradiation was designed and implemented. The results demonstrated that Vero4DRT has adequate mechanical accuracy and beam output constancy during gantry and ring rotation. PACS number: 87
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影响因子：
3.8
作者：
Tyagi, Neelam;Yang, Kai;Yan, Di
通讯作者：
Yan, Di
影响因子：
2
作者：
Mizowaki T;Takayama K;Nagano K;Miyabe Y;Matsuo Y;Kaneko S;Kokubo M;Hiraoka M
通讯作者：
Hiraoka M
影响因子：
5.7
作者：
Fahimian, Benjamin;Yu, Victoria;Hristov, Dimitre
通讯作者：
Hristov, Dimitre
影响因子：
2.1
作者：
Popescu, Carmen C.;Beckham, Wayne A.;Vlachaki, Maria T.
通讯作者：
Vlachaki, Maria T.
DOI：
10.1016/j.ijrobp.2010.03.004
发表时间：
2011-07-01
影响因子：
7
作者：
Shaitelman, Smona F.;Kim, Leonard H.;Grills, Inga S.
通讯作者：
Grills, Inga S.