Commissioning of the TrueBeam STx 6 MV FFF Beam in the RayStation Treatment Planning System for SRS and SBRT Treatments

• 作者: Yongsook C. Lee Yongbok Kim
• 来源期刊: 医学物理学、临床工程、放射肿瘤学(英文)
• 学科: 物理学
• 关键词: Commissioning TrueBeam STx 6 MV Flattening-Filter Free (FFF) RayStation Stereotactic Radiosurgery (SRS) and Stereotactic Body Radiation Therapy (SBRT)
• 年，卷（期）: 2021,（1）
• 页码范围: 16-37
• 页数: 22页
• 分类号: O57

摘要

<strong>Purpose:</strong> The purpose of this study is to provide technical information on commissioning the TrueBeam STx 6 MV flattening-filter free (FFF) beam in the RayStation treatment planning system (TPS) for stereotactic radiosurgery (SRS) and stereotactic body radiation therapy (SBRT) treatments. <strong>Methods:</strong> For beam modeling, percent depth dose curves, profiles and output factors for jaw-collimated fields and stereotactic cones as well as X-jaws transmission were measured. For multi-leaf collimator (MLC) modeling, MLC model parameters such as offset, gain, curvature, leaf tip width, tongue and groove and transmission were determined and output factors for MLC-collimated fields were measured. Absolute dose calibration was also performed. For beam model and MLC model validation, the American Association of Physicists in Medicine Task Group-119 plans, clinical SRS and SBRT plans and end-to-end testing were performed. <strong>Results:</strong> Beam characteristics of the 6 MV FFF beam agreed well with those in the literature. Validation results showed that our beam model and MLC model were acceptable for SRS and SBRT treatments. <strong>Conclusions:</strong> The technical information and dosimetric data provided in this study will be a useful reference for other clinics/institutions which will commission the same machine energy in the RayStation TPS.