A Simplified Approach for Determination of Inflection Points of Flattening Filter-Free Photon Beam Using In-House Developed Software and Derivation of Reference Levels.

IF 0.7 Q4 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Journal of Medical Physics Pub Date : 2023-07-01 Epub Date: 2023-09-18 DOI:10.4103/jmp.jmp_50_23

Smriti Sharma, D K Dixit, S D Sharma, Amit Sharma, G Sahani, Ritu Raj Upreti, R A Kinhikar, P K Dash Sharma

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Abstract

Aim: This article aimed to present the salient features of the in-house developed Java program for the determination of inflection point and dosimetric parameters of flattening filter-free (FFF) photon beam. Reference levels for the dosimetric parameters of the FFF photon beams were also presented.

Materials and methods: Beam profiles of 6 MV FFF and 10 MV FFF photon beams for a collimator setting of 20 cm × 20 cm measured at 10 cm depth in an isocentric setup acquired from various institutions were analyzed using an in-house developed Java program and manual method. The values of reference dose value (RDV), field size, penumbra, and degree of un-flatness (defined as the lateral separation between 90% [X_90%], 75% [X_75%], and 60% [X_60%] dose points on the profile) were calculated and compared. The reference values of field size, penumbra, and degree of un-flatness were also determined for Varian and Elekta medical electron linear accelerators (LINACs).

Results: The maximum differences for RDV determined using the Java method and manual method are 2.4% and 2.7% for 6 and 10 MV FFF photon beams, respectively. The maximum difference between the values of field size, penumbra, and degree of un-flatness determined using Java and manual methods is within 1.3 mm. The reference values of field size and penumbra for Varian LINACs are 19.94 ± 0.10 cm and 0.83 ± 0.08 cm (6 MV FFF) and 19.95 ± 0.10 cm and 0.83 ± 0.08 cm (10 MV FFF). Similarly, the reference values of field size and penumbra for Elekta LINACs are 20.02 ± 0.09 cm and 0.94 ± 0.12 cm (6 MV FFF) and 20.03 ± 0.11 cm and 0.97 ± 0.16 cm (10 MV FFF).

Conclusions: A software program was developed in Java for analyzing the beam profiles of FFF photon beams. The results of Java-derived values of dosimetric parameters of FFF photon beams were found in good agreement with the values determined using the manual method. The reference values of these parameters were also derived and quoted using a large cohort of the data.

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利用自行开发的软件和参考能级的推导，简化了确定无滤波平坦光子光束拐点的方法。

目的:介绍自行开发的用于确定无压平滤波(FFF)光子束拐点和剂量学参数的Java程序的特点。给出了FFF光子光束剂量学参数的参考水平。材料和方法:利用自制的Java程序和手工方法，分析了从不同机构获得的6毫伏FFF和10毫伏FFF光子光束的光束轮廓，这些光束在20厘米× 20厘米的准直器设置下，在10厘米深的等心装置中测量。计算并比较参考剂量值(RDV)、场大小、半暗带和非平坦度(定义为轮廓上90% [X90%]、75% [X75%]和60% [X60%]剂量点之间的横向距离)的值。还确定了Varian和Elekta医用电子直线加速器(LINACs)的场大小、半影和非平坦度的参考值。结果:对于6 MV和10 MV FFF光子束，Java法和手工法测定的RDV最大差异分别为2.4%和2.7%。使用Java和手工方法测定的场大小、半影和不平整度值的最大差异在1.3 mm以内。瓦里安LINACs的视场大小和半影参考值分别为19.94±0.10 cm和0.83±0.08 cm (6 MV FFF)和19.95±0.10 cm和0.83±0.08 cm (10 MV FFF)。同样，Elekta LINACs的视场大小和半影参考值分别为20.02±0.09 cm和0.94±0.12 cm (6 MV FFF)和20.03±0.11 cm和0.97±0.16 cm (10 MV FFF)。结论:用Java语言开发了FFF光子光束轮廓分析软件。java导出的FFF光子光束剂量学参数值与手工方法测定的值吻合较好。这些参数的参考值也通过大量的队列数据推导和引用。

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来源期刊

Journal of Medical Physics RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-

CiteScore

1.10

自引率

11.10%

发文量

审稿时长

30 weeks

期刊介绍： JOURNAL OF MEDICAL PHYSICS is the official journal of Association of Medical Physicists of India (AMPI). The association has been bringing out a quarterly publication since 1976. Till the end of 1993, it was known as Medical Physics Bulletin, which then became Journal of Medical Physics. The main objective of the Journal is to serve as a vehicle of communication to highlight all aspects of the practice of medical radiation physics. The areas covered include all aspects of the application of radiation physics to biological sciences, radiotherapy, radiodiagnosis, nuclear medicine, dosimetry and radiation protection. Papers / manuscripts dealing with the aspects of physics related to cancer therapy / radiobiology also fall within the scope of the journal.