Commissioning measurements for photon beam data on three TrueBeam linear accelerators, and comparison with Trilogy and Clinac 2100 linear accelerators.
Commissioning measurements for photon beam data on three TrueBeam linear accelerators, and comparison with Trilogy and Clinac 2100 linear accelerators.
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DOI：
10.1120/jacmp.v14i1.4077
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发表时间：
2013-01-07
影响因子：
2.1
通讯作者：
Beyer GP
中科院分区：
文献类型：
--
作者：
Beyer GP
本文介绍了3台TrueBeam直线加速器的束流数据测量结果。将TrueBeam直线加速器内的测量光束数据与来自同一制造商的其他两个直线加速器（即Clinac和Trilogy）进行了额外的评估，以识别和评估机器之间光束特性的任何差异，并评估光束匹配标准光子能量的可能性。我们在三个不同的TrueBeam线性加速器之间进行了两个标准光子能量（6 MV和15 MV）和一个无平坦滤波（“FFF”）光子能量（10 FFF）的委托光子束数据的比较。然后对光束数据进行分析，以评估结果的可重复性以及TrueBeam线性加速器之间“光束匹配”的可能性。此外，将TrueBeam线性加速器的数据与同一制造商生产的Clinac和Trilogy线性加速器模型的可比数据进行比较，以评估TrueBeam线性加速器与先前模型之间“光束匹配”的可能性。两种线性加速器模型之间的能量评估值分别为低能的6 MV和高能的15 MV。三个TrueBeam线性加速器之间的PDD和输出因子数据的变化小于1%，剖面数据的变化在1%或2mm以内。TrueBeam、Clinac和Trilogy线性加速器之间的PDD和剖面数据几乎相同（差异小于1%）。在15 MV的浅深度（）下，由于压平滤波器设计的差异，在剖面形状上观察到微小的变化。在TrueBeam和其他线性加速器之间观察到半影形状的差异；TrueBeam的数据产生了稍微大一点的半影宽度。对角线扫描显示，在距离中轴线大于20 cm的地方，剖面形状存在显著差异，这在15 MV能量处更为明显。输出因子差异主要出现在场大小谱的末端，与其他线性加速器相比，观察到的差异小于2%。TrueBeam的输出系数随油田大小的变化比之前型号的输出系数变化较小；对于6 MV来说尤其如此。发现光子束数据在不同的TrueBeam线性加速器之间是可重复的，在可接受的临床耐受性范围内。结果表明TrueBeam机头结构的可重复性以及这些类型的线性加速器之间的光束匹配潜力。与TrueBeam直线加速器测量的相同数据相比，来自Trilogy和Clinac 2100的光子束数据（6 MV和15 MV）显示出一些相似之处和一些小的变化。所发现的差异可能会影响TrueBeam与同一制造商以前的线性加速器模型之间的小场数据和非常大的场尺寸，但应该在临床接受的标准场尺寸和标准治疗范围内。PACS数字：87.56。双相障碍
This study presents the beam data measurement results from the commissioning of three TrueBeam linear accelerators. An additional evaluation of the measured beam data within the TrueBeam linear accelerators contrasted with two other linear accelerators from the same manufacturer (i.e., Clinac and Trilogy) was performed to identify and evaluate any differences in the beam characteristics between the machines and to evaluate the possibility of beam matching for standard photon energies. We performed a comparison of commissioned photon beam data for two standard photon energies (6 MV and 15 MV) and one flattening filter‐free (“FFF”) photon energy (10 FFF) between three different TrueBeam linear accelerators. An analysis of the beam data was then performed to evaluate the reproducibility of the results and the possibility of “beam matching” between the TrueBeam linear accelerators. Additionally, the data from the TrueBeam linear accelerator was compared with comparable data obtained from one Clinac and one Trilogy linear accelerator models produced by the same manufacturer to evaluate the possibility of “beam matching” between the TrueBeam linear accelerators and the previous models. The energies evaluated between the linear accelerator models are the 6 MV for low energy and the 15 MV for high energy. PDD and output factor data showed less than 1% variation and profile data showed variations within 1% or 2 mm between the three TrueBeam linear accelerators. PDD and profile data between the TrueBeam, the Clinac, and Trilogy linear accelerators were almost identical (less than 1% variation). Small variations were observed in the shape of the profile for 15 MV at shallow depths () probably due to the differences in the flattening filter design. A difference in the penumbra shape was observed between the TrueBeam and the other linear accelerators; the TrueBeam data resulted in a slightly greater penumbra width. The diagonal scans demonstrated significant differences in the profile shapes at a distance greater than 20 cm from the central axis, and this was more notable for the 15 MV energy. Output factor differences were found primarily at the ends of the field size spectrum, with observed differences of less than 2% as compared to the other linear accelerators. The TrueBeam's output factor varied less as a function of field size than the output factors for the previous models; this was especially true for the 6 MV. Photon beam data were found to be reproducible between different TrueBeam linear accelerators well within the accepted clinical tolerance of . The results indicate reproducibility in the TrueBeam machine head construction and a potential for beam matching between these types of linear accelerators. Photon beam data (6 MV and 15 MV) from the Trilogy and Clinac 2100 showed several similarities and some small variations when compared to the same data measured on the TrueBeam linear accelerator. The differences found could affect small field data and also very large field sizes in beam matching considerations between the TrueBeam and previous linear accelerator models from the same manufacturer, but should be within the accepted clinical tolerance for standard field sizes and standard treatments. PACS number: 87.56. bd
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