Department of Medical Physics, Hospital Universitario Santa Lucia, Cartagena, Spain.
Phys Med. 2013 Jun;29(4):341-9. doi: 10.1016/j.ejmp.2012.05.003. Epub 2012 May 30.
A redundant independent dosimetric calculation (RIDC) prior to treatment has become a basic part of the QA process for 3D conventional radiotherapy, and is strongly recommended in several international publications. On the other hand, the rapid growth in the number of intensity modulated treatments has led to a significant increase in the workflow associated with QA treatments. Diamond ("K&S Associates") is RIDC software which is capable of calculating VMAT (Volumetric Modulated Arc Therapy) fields. Modeling, validation and commissioning are necessary steps thereby making it a useful tool for VMAT QA. In this paper, a procedure for the validation of the calculation algorithm is demonstrated. A set 3D conventional field was verified in two ways: firstly, a comparison was made between Diamond calculations and experimental measures obtaining an average deviation of -0.1 ± 0.7%(1SD), and secondly, a comparison made between Diamond and the treatment planning system (TPS) Eclipse, obtaining an average deviation of 0.4 ± 0.8%(1SD). For both steps, a plastic slab phantom was used. VMAT validation was carried out by analyzing 59 VMAT plans in two ways: first, Diamond calculation versus experimental measurement with an average deviation of -0.2 ± 1.7%(1SD), and second, Diamond calculation versus TPS calculation with an average deviation of 0.0 ± 1.6%(1SD). In this phase a homogeneous cylindrical phantom was used. These results led us to consider this calculation algorithm validated for use in VMAT verifications.
在治疗前进行冗余独立剂量计算（RIDC）已经成为三维常规放射治疗质量保证（QA）过程的基本组成部分，并且在几个国际出版物中强烈推荐。另一方面，强度调制治疗数量的快速增长导致与 QA 治疗相关的工作流程显著增加。Diamond（“K&S Associates”）是一种能够计算容积调强弧形治疗（VMAT）场的 RIDC 软件。建模、验证和调试是必要的步骤，因此使其成为 VMAT QA 的有用工具。本文展示了一种验证计算算法的程序。通过两种方式验证了一组三维常规场：首先，将 Diamond 计算与实验测量进行比较，平均偏差为-0.1 ± 0.7%（1SD），其次，将 Diamond 与治疗计划系统（TPS）Eclipse 进行比较，平均偏差为 0.4 ± 0.8%（1SD）。对于这两个步骤，均使用了塑料平板体模。通过两种方式对 59 个 VMAT 计划进行了 VMAT 验证：首先，Diamond 计算与实验测量的平均偏差为-0.2 ± 1.7%（1SD），其次，Diamond 计算与 TPS 计算的平均偏差为 0.0 ± 1.6%（1SD）。在这个阶段，使用了一个均匀的圆柱形体模。这些结果使我们认为该计算算法可用于 VMAT 验证。
