| Zhou Benmei,Zha Xiaoying,Tan Yong,Xiao Peng,Hu Mingzong.Applying an ArcCHECK detector to the dose verification for ultra-long target volumes of cervical cancer[J].Chinese Journal of Radiological Medicine and Protection,2023,43(8):601-606 |
| Applying an ArcCHECK detector to the dose verification for ultra-long target volumes of cervical cancer |
| Received:February 08, 2023 |
| DOI：10.3760/cma.j.cn112271-20230208-00029 |
| KeyWords:Cervical cancer Ultra-long target volume Dose verification Gamma pass rate |
| FundProject:宜宾市科技计划项目（2021SF015） |
| Author Name | Affiliation | E-mail | | Zhou Benmei | Cancer Center, Second People's Hospital of Yibin City, Yibin 644000, China | | | Zha Xiaoying | Cancer Center, Second People's Hospital of Yibin City, Yibin 644000, China | | | Tan Yong | Cancer Center, Second People's Hospital of Yibin City, Yibin 644000, China | | | Xiao Peng | Cancer Center, Second People's Hospital of Yibin City, Yibin 644000, China | | | Hu Mingzong | Cancer Center, Second People's Hospital of Yibin City, Yibin 644000, China | 2276287859@qq.com |
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| Abstract:: |
| Objective To explore the feasibility of applying an ArcCHECK detector to the dose verification for ultra-long target volumes of cervical cancer.Methods This study retrospectively selected patients suffering from cervical cancer with ultra-long target volumes (lengths: ≥ 26 cm; 50 cases; the ultra-long target volume group) and conventional target volumes (lengths:< 26 cm; 50 cases; the conventional target volume group). Subsequently, this study designed treatment plans using the Volumetric Modulated Arc Therapy (VMAT) technique and then collected and verified doses using an ArcCHECK detector. The dose detection for the conventional target volume group was performed at the central point of the detector (marked by iso and Short-0 cm). Then, the detector was moved for 5 cm along the bed exit direction (marked by iso 1), followed by the dose verification of the ultra-long target volume group (marked by Long-5 cm) and conventional target volume group (marked by Short-5 cm). The geometric parameters (the length and volume of a target volume), mechanical parameters (machine hop count and the duration of irradiation), and gamma pass rates (GPRs) under different detection conditions of each group were analyzed.Results The target lengths, target volumes, machine hop counts, and irradiation durations of the ultra-long target group were higher than those of the conventional target group (t=2.61-18.56, P < 0.05). For the conventional target group, the GPRs at iso 1 were significantly lower than those at iso (t=2.14-8.17, P < 0.05). Meanwhile, the GPRs at iso 1 of the ultra-long target volume group were significantly lower than those of the conventional target volume group (t=-4.70 to -2.73, P < 0.01). The GPRs of each group met clinical requirements for criteria of both 3%/3 mm and 3%/2 mm.Conclusions The deviation of the positioning center and the length of the target volume serve as primary factors affecting the dose verification result of cervical cancer. For ultra-long target volumes, dose verification can be performed by moving the positioning center, thus ensuring treatment accuracy for cervical cancer patients. |
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