一种计算光子束加速器体模散射因子的分析方法。
An Analytical Method to Calculate Phantom Scatter Factor for Photon Beam Accelerators.
作者信息
Birgani Mohammad Javad Tahmasebi, Chegeni Nahid, Behrooz Mohammad Ali, Bagheri Marziyeh, Danyaei Amir, Shamsi Azin
机构信息
Ph.D. of Medical Physics, Professor, Department of Medical Physics and Radiation Therapy and Medical Physics Department, Golestan Hospital, Jundishapur University of Medical Sciences, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences: Ahvaz, Iran.
Ph.D. of Medical Physics, Assistant Professor, Department of Medical Physics, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences: Ahvaz, Iran.
出版信息
Electron Physician. 2017 Jan 25;9(1):3523-3528. doi: 10.19082/3523. eCollection 2017 Jan.
INTRODUCTION
One of the important input factors in the commissioning of the radiotherapy treatment planning systems is the phantom scatter factor (Sp) which requires the same collimator opening for all radiation fields. In this study, we have proposed an analytical method to overcome this issue.
METHODS
The measurements were performed using Siemens Primus Plus with photon energy 6 MV for field sizes from 5×5cm to 40×40cm. Phantom scatter factor was measured through the division of total scatter output factors (Scp), and collimator scatter factor (Sc).
RESULTS
The mean percent difference between the measured and calculated Sp was 1.00% and -3.11% for 5×5, 40×40 cm field size respectively.
CONCLUSION
This method is applicable especially for small fields used in IMRT which, measuring collimator scatter factor is not reliable due to the lateral electron disequilibrium.
引言
放射治疗计划系统调试中的重要输入因素之一是体模散射因子（Sp），它要求所有辐射野的准直器开口相同。在本研究中，我们提出了一种分析方法来克服这个问题。
方法
使用西门子Primus Plus在光子能量为6 MV的条件下，对5×5cm至40×40cm的射野尺寸进行测量。通过总散射输出因子（Scp）与准直器散射因子（Sc）相除来测量体模散射因子。
结果
对于5×5cm和40×40cm的射野尺寸，测量值与计算值之间的平均百分比差异分别为1.00%和 -3.11%。
结论
该方法特别适用于调强放射治疗中使用的小射野，因为由于横向电子不平衡，测量准直器散射因子并不可靠。
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