Wendykier Jacek, Bieniasiewicz Marcin, Grządziel Aleksandra, Jedynak Tadeusz, Kośniewski Wiktor, Reudelsdorf Marta, Wendykier Piotr
Radiotherapy and Brachytherapy Planning Department, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Gliwice Branch, Wybrzeże Armii Krajowej 15, 44-101 Gliwice, Poland.
Radiotherapy Department, Opole Oncology Center, Katowicka 66a, 45-060 Opole, Poland; Institute of Physics, University of Opole, Oleska 48, 45-052 Opole, Poland.
Rep Pract Oncol Radiother. 2016 May-Jun;21(3):168-73. doi: 10.1016/j.rpor.2015.12.007. Epub 2016 Feb 13.
This work addresses the problem of treatment planning system commissioning by introducing a new method of determination of boundaries between high and low gradient in beam profile.
The commissioning of a treatment planning system is a very important task in the radiation therapy. One of the main goals of this task is to compare two field profiles: measured and calculated. Applying points of 80% and 120% of nominal field size can lead to the incorrect determination of boundaries, especially for small field sizes.
The method that is based on the beam profile gradient allows for proper assignment of boundaries between high and low gradient regions even for small fields. TRS 430 recommendations for commissioning were used.
The described method allows a separation between high and low gradient, because it directly uses the value of the gradient of a profile. For small fields, the boundaries determined by the new method allow a commissioning of a treatment planning system according to the TRS 430, while the point of 80% of nominal field size is already in the high gradient region.
The method of determining the boundaries by using the beam profile gradient can be extremely helpful during the commissioning of the treatment planning system for Intensity Modulated Radiation Therapy or for other techniques which require very small field sizes.
本研究通过引入一种确定射束轮廓中高梯度和低梯度之间边界的新方法，来解决治疗计划系统的调试问题。
治疗计划系统的调试是放射治疗中一项非常重要的任务。该任务的主要目标之一是比较两个野轮廓：测量值和计算值。应用标称野尺寸80%和120%的点可能会导致边界的错误确定，尤其是对于小野尺寸。
基于射束轮廓梯度的方法即使对于小野也能正确划分高梯度和低梯度区域之间的边界。使用了TRS 430调试建议。
所描述的方法能够区分高梯度和低梯度，因为它直接使用轮廓梯度值。对于小野，新方法确定的边界允许根据TRS 430对治疗计划系统进行调试，而标称野尺寸80%的点已经处于高梯度区域。
利用射束轮廓梯度确定边界的方法在调强放射治疗或其他需要非常小野尺寸的技术的治疗计划系统调试过程中可能会非常有帮助。
