本文探讨了Octavius 4D系统用于容积旋转调强放射治疗（VMAT）三维剂量验证的稳定性。比较分析了semiflex电离室和Octavius 729探测器阵列在6 MV、10 MV射束下对射野大小、剂量线性、剂量率线性和射野输出因子的响应。测量观察Octavius 4D系统旋转过程中角度仪示值与机架角的角度偏差。用3 %/3 mm标准分析（10×10）cm2旋转照射计划和VMAT计划机架归零与旋转照射的二维剂量分布；用3%/3 mm gamma分析标准评估VMAT计划。结果显示，预热剂量大于6 Gy是探测器稳定的必要条件。探测器阵列剂量响应是线性的，不同标称剂量率下剂量测量是稳定的。旋转照射过程中加速器机架角和Octavius 4D模体旋转角度误差在0.4°以内。6 MV和10 MV射束VMAT计划在分析标准为3%/3 mm时，三维剂量分布的平均通过率分别为96.03%和95.56%，满足临床计划剂量验证的标准。Octavius4D模体联合Octavius 729探测器阵列是一套稳定性装置，用于治疗前验证VMAT计划是可靠的。
", "ds_source": "文章比较分析了semiflex电离室和Octavius 729探测器阵列在6 MV、10 MV射束下对射野大小、剂量线性、剂量率线性和射野输出因子的响应等。
", "ds_process_way": "利用Octavius 4D系统加工
", "ds_quality": "良好
", "ds_acq_start_time": "2017-01-01 00:00:00", "ds_acq_end_time": "2019-12-31 00:00:00", "ds_acq_place": "甘肃兰州", "ds_acq_lon_east": null, "ds_acq_lat_south": null, "ds_acq_lon_west": null, "ds_acq_lat_north": null, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "apply-access", "ds_total_size": 11943466, "ds_files_count": 2, "ds_format": "pdf", "ds_space_res": null, "ds_time_res": "", "ds_coordinate": "无", "ds_projection": "", "ds_thumbnail": "4b497eca-fbaa-402f-88eb-08eabed65783.png", "ds_thumb_from": 0, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "", "ds_from_station": null, "organization_id": "9971252d-7beb-4464-bc08-bdcc5a1d7dd1", "ds_serv_man": "敏玉芳", "ds_serv_phone": "0931-4967596", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": [], "quality_level": 3, "publish_time": "2023-12-28 08:59:03", "last_updated": "2023-12-28 08:59:03", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.NCDC.IMP.DB4137.2023", "i18n": { "en": { "title": "Stability analysis of Octavius 4D system", "ds_format": "", "ds_source": "The response of semiflex ionization chamber and Octavius 729 detector array to field size, dose linearity, dose rate linearity and field output factor under 6 MV and 10 MV beams are compared and analyzed.
", "ds_quality": "good
", "ds_ref_way": "", "ds_abstract": "\"This paper discusses the stability of Octavius 4D system in three-dimensional dose verification of volumetric intensity modulated radiation therapy (VMAT). The response of semiflex ionization chamber and Octavius 729 detector array to field size, dose linearity, dose rate linearity and field output factor under 6 MV and 10 MV beams are compared and analyzed. Measure and observe the angle deviation between the indicator value of the goniometer and the frame angle during the rotation of Octavius 4D system. 3% / 3 mm standard (10 × 10) The two-dimensional dose distribution of rotation irradiation plan and VMAT plan were compared; The VMAT plan was evaluated with 3% / 3 mm gamma analysis standard. The results show that the preheating dose greater than 6 Gy is necessary for the stability of the detector. The dose response of detector array is linear, and the dose measurement is stable under different nominal dose rates. The error between the angle of accelerator frame and the rotation angle of Octavius 4D phantom is less than 0.4 ° Within. When the analysis standard of 6 MV and 10 MV beam VMAT was 3% / 3 mm, the average passing rate of three-dimensional dose distribution was 96.03% and 95.56%, respectively, which met the standard of clinical dose verification. Octavius 4D phantom combined with Octavius 729 detector array is a set of stability device, which is used to verify the reliability of VMAT plan before treatment“
", "ds_time_res": "", "ds_acq_place": "Lanzhou, Gansu", "ds_space_res": "", "ds_projection": "", "ds_process_way": "Machining with Octavius 4D system
", "ds_ref_instruction": "" } }, "submit_center_id": "ncdc", "data_level": 0, "license_type": "https://creativecommons.org/licenses/by/4.0/", "doi_reg_from": "reg_local", "cstr_reg_from": "reg_local", "doi_not_reg_reason": null, "cstr_not_reg_reason": null, "is_paper_in_submitting": false, "ds_topic_tags": [ "Octavius 4D系统", "容积旋转调强放射疗法", "探测器矩阵", "γ通过率", "稳定性" ], "ds_subject_tags": [], "ds_class_tags": [], "ds_locus_tags": [ "兰州", "甘肃省" ], "ds_time_tags": [ 2018 ], "ds_contributors": [ { "true_name": "肖国青", "email": "xiaogq@impcas.ac.cn", "work_for": "中国科学院近代物理研究所", "country": "中国" } ], "ds_meta_authors": [ { "true_name": "肖国青", "email": "xiaogq@impcas.ac.cn", "work_for": "中国科学院近代物理研究所", "country": "中国" } ], "ds_managers": [ { "true_name": "肖国青", "email": "xiaogq@impcas.ac.cn", "work_for": "中国科学院近代物理研究所", "country": "中国" } ], "category": "其他" }