Department of Radiation Oncology, Washington University School of Medicine, 4921 Parkview Place, St Louis, Missouri.
Department of Radiation Oncology, Scott and White Clinic, Temple, Texas.
Pract Radiat Oncol. 2013 Oct-Dec;3(4):e199-208. doi: 10.1016/j.prro.2012.11.013. Epub 2013 Jan 15.
Traditionally, initial and weekly chart checks involve checking various parameters in the treatment management system against the expected treatment parameters and machine settings. This process is time-consuming and labor intensive. We explore utilizing the Varian TrueBeam log files (Varian Medical System, Palo Alto, CA), which contain the complete delivery parameters for an end-to-end verification of daily patient treatments.
An in-house software tool for 3-dimensional (3D) conformal therapy, enhanced dynamic wedge delivery, intensity modulated radiation therapy (IMRT), volumetric modulated radiation therapy, flattening filter-free mode, and electron therapy treatment verification was developed. The software reads the Varian TrueBeam log files, extracts the delivered parameters, and compares them against the original treatment planning data. In addition to providing an end-to-end data transfer integrity check, the tool also verifies the accuracy of treatment deliveries. This is performed as part of the initial chart check for IMRT plans and after first fraction for the 3D plans. The software was validated for consistency and accuracy for IMRT and 3D fields.
Based on the validation results the accuracy of MLC, jaw and gantry positions were well within the expected values. The patient quality assurance results for 127 IMRT patients and 51 conventional fields were within 0.25 mm for multileaf collimator positions, 0.3 degree for gantry angles, 0.13 monitor units for monitor unit delivery accuracy, and 1 mm for jaw positions. The delivered dose rates for the flattening filter-free modes were within 1% of the planned dose rates.
The end-to-end data transfer check using TrueBeam log files and the treatment delivery parameter accuracy check provides an efficient, reliable beam parameter check process for various radiation delivery techniques.
传统上，初始和每周图表检查涉及检查治疗管理系统中的各种参数，以与预期的治疗参数和机器设置相对照。这个过程既耗时又费力。我们探索利用瓦里安 TrueBeam 日志文件（瓦里安医疗系统，加利福尼亚州帕洛阿尔托），其中包含端到端验证每日患者治疗的完整交付参数。
为 3 维（3D）适形治疗、增强动态楔形交付、调强放射治疗（IMRT）、容积调强放射治疗、无平坦滤波器模式和电子治疗验证开发了一种内部软件工具。该软件读取瓦里安 TrueBeam 日志文件，提取交付参数，并将其与原始治疗计划数据进行比较。除了提供端到端数据传输完整性检查外，该工具还验证了治疗交付的准确性。这是作为 IMRT 计划初始图表检查的一部分以及 3D 计划的第一个分数进行的。该软件经过验证，可确保 IMRT 和 3D 场的一致性和准确性。
根据验证结果，MLC、机架和龙门架位置的精度在预期值内。127 例 IMRT 患者和 51 例常规场的患者质量保证结果为：多叶准直器位置为 0.25 毫米，龙门架角度为 0.3 度，MU 传递精度为 0.13MU，颌位置为 1 毫米。无平坦滤波器模式的传递剂量率在计划剂量率的 1%以内。
使用 TrueBeam 日志文件进行端到端数据传输检查和治疗交付参数准确性检查为各种放射治疗技术提供了一种高效、可靠的光束参数检查过程。
