Adolfsson Emelie, Wesolowska Paulina, Izewska Joanna, Lund Eva, Tedgren Åsa Carlsson
Department of Radiation Physics and Department of Medical and Health Sciences, Linköping University, SE-581 85 Linköping, Sweden.
International Atomic Energy Agency, Dosimetry and Medical Radiation Physics Section, 1020 Vienna, Austria.
Radiat Prot Dosimetry. 2019 Dec 31;186(1):119-122. doi: 10.1093/rpd/ncy289.
The aim of this study was to test two different solid state dosimetry systems for the purpose of end-to-end audits of radiotherapy volumetric modulated arc therapy (VMAT) technique; a lithium formate electron paramagnetic resonance system and a lithium fluoride thermoluminescent dosimetry system. As a complement to the solid state systems, ion chamber measurements were performed. A polystyrene phantom with a planning target volume (PTV) and an organ at risk (OAR) structure was scanned using CT. A VMAT dose plan was optimized to deliver 2 Gy to the target volume and to minimize the dose to the OAR. The different detectors were inserted into the phantom and the planned dose distribution was delivered. The measured doses were compared to the treatment planning system (TPS) calculated doses. Good agreement was found between the TPS calculated and the measured doses, well accepted for the dose determinations in remote dosimetry audits of VMAT treatment technique.
本研究的目的是测试两种不同的固态剂量测定系统，用于放射治疗容积调强弧形治疗（VMAT）技术的端到端审核；一种是甲酸锂电子顺磁共振系统，另一种是氟化锂热释光剂量测定系统。作为固态系统的补充，进行了电离室测量。使用CT扫描了一个带有计划靶区（PTV）和危及器官（OAR）结构的聚苯乙烯体模。优化VMAT剂量计划，以向靶区输送2 Gy的剂量，并使OAR的剂量最小化。将不同的探测器插入体模中，并输送计划的剂量分布。将测量的剂量与治疗计划系统（TPS）计算的剂量进行比较。发现TPS计算剂量与测量剂量之间具有良好的一致性，这在VMAT治疗技术的远程剂量测定审核中的剂量确定中是可以接受的。
