Feasibility Study of Using XRV-124 Scintillation Detector for Collinearity Measurement in Uniform Scanning Proton Therapy.

IF 2.1 Q3 ONCOLOGY International Journal of Particle Therapy Pub Date : 2022-04-22 eCollection Date: 2022-01-01 DOI:10.14338/IJPT-21-00040.1
Biniam Tesfamicael, Colton Eckert, Suresh Rana
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引用次数: 1

Abstract

Purpose: The purpose of this work is to study the feasibility of using an XRV-124 scintillation detector in measuring the collinearity of the x-ray system and uniform scanning proton beam.

Methods: A brass aperture for Snout 10 was manufactured. The center of the aperture had an opening of 1 cm in diameter (4 cm for the film measurements). The 2D kV x-ray images of the XRV-124 were acquired such that the marker inside the detector is aligned to the imaging isocenter. After obtaining the optimal camera settings, a uniform scanning proton beam was delivered for various ranges (12 g/cm2 to 28 g/cm2 in step size of 2 g/cm2). For each range, 10 monitor units (MU) of the first layer were delivered to the XRV-124 detector. Collinearity tests were repeated by using EDR2 and EBT3 films following our current quality assurance protocol in practice. The results from the XRV-124 measurements were compared against the collinearity results from EDR2 and EBT3 films.

Results and discussion: The collinearity results were evaluated in the horizontal (x) and vertical (y) directions. The average deviation in collinearity in the x-direction was -0.24 ± 0.30 mm, 0.57 ± 0.39 mm, and -0.27 ± 0.14 mm for EDR2, EBT3, and XRV-124, respectively. In the y-direction, the average deviation was 0.39 ± 0.07 mm, 0.29 ± 0.14 mm, and 0.39 ± 0.03 mm for EDR2, EBT3, and XRV-124, respectively.

Conclusion: The measurement results from the XRV-124 and films are in good agreement. Compared to film, the use of the XRV-124 detector for collinearity measurements in uniform scanning protons is more efficient and provides results in real time.

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XRV-124闪烁探测器用于均匀扫描质子治疗共线性测量的可行性研究。
目的:研究用XRV-124闪烁探测器测量x射线系统和均匀扫描质子束共线性的可行性。方法:制作10号口鼻的黄铜孔。光圈中心的开口直径为1厘米(薄膜测量为4厘米)。获得了XRV-124的二维kV x射线图像,使得探测器内部的标记与成像等中心对齐。在获得最佳相机设置后,在不同范围内(12 g/cm2至28 g/cm2,步长为2 g/cm2)均匀扫描质子束。对于每个量程,将第一层的10个监视器(MU)交付给XRV-124探测器。使用EDR2和EBT3薄膜,按照我们目前的质量保证方案重复共线性测试。XRV-124的测量结果与EDR2和EBT3薄膜的共线性结果进行了比较。结果与讨论:在水平(x)和垂直(y)方向上评价共线性结果。EDR2、EBT3和XRV-124的x方向共线性平均偏差分别为-0.24±0.30 mm、0.57±0.39 mm和-0.27±0.14 mm。在y方向上,EDR2、EBT3和XRV-124的平均偏差分别为0.39±0.07 mm、0.29±0.14 mm和0.39±0.03 mm。结论:XRV-124的测量结果与薄膜的测量结果吻合较好。与胶片相比,使用XRV-124探测器在均匀扫描质子中进行共线性测量更有效,并提供实时结果。
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来源期刊
International Journal of Particle Therapy
International Journal of Particle Therapy Medicine-Radiology, Nuclear Medicine and Imaging
CiteScore
3.70
自引率
5.90%
发文量
23
审稿时长
20 weeks
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