Target volume margins and positioning errors in radiotherapy for nasopharyngeal carcinoma using Halcyon linear accelerator
10.3969/j.issn.1005-202X.2023.12.002
- VernacularTitle:Halcyon直线加速器在鼻咽癌放疗中靶区外放边界及摆位误差分析
- Author:
Jiehong SU
1
;
Xiaping WEI
;
Zihan ZHOU
;
Yanxin DONG
;
Yi ZHU
;
Yuwei YAO
;
Yeming LIU
;
Mingchao HUANG
;
Jing DONG
;
Xiaowei HUANG
Author Information
1. 广州中医药大学金沙洲医院肿瘤放射治疗中心,广东广州 510080
- Keywords:
nasopharyngeal carcinoma;
Halcyon;
cone-beam computed tomography;
positioning error;
target volume margin
- From:Chinese Journal of Medical Physics
2023;40(12):1459-1462
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the target volume margins and positioning errors in the radiotherapy for nasopharyngeal carcinoma(NPC)using the cone-beam computed tomography(CBCT)of Halcyon linear accelerator for providing a reference for the margin from clinical target volume to planning target volume(CTV-to-PTV margin)in the radiotherapy for NPC using Halcyon linear accelerator,hence improving treatment precision and effectiveness.Methods A total of 117 NPC patients who received volumetric modulated arc therapy using Halcyon linear accelerator from May 2020 to June 2022 in Jinshazhou Hospital of Guangzhou University of Chinese Medicine were enrolled.The 3861 CBCT images collected from the patients were matched with the CT images to obtain the correction values of the treatment couch in lateral(Lat),longitudinal(Lng)and vertical(Vrt)directions for positioning error analysis.The CTV-to-PTV margin was obtained by the equation(margin =2.5∑+0.7δ).Results The positioning errors in the radiotherapy for NPC using Halcyon linear accelerator were 0.10(0.00,0.10)cm,0.10(0.00,0.20)cm and 0.20(0.10,0.30)cm in Lat,Lng and Vrt directions,respectively.The CTV-to-PTV margins in Lat,Lng and Vrt directions were 0.12,0.12 and 0.09 cm,respectively.Conclusion Low positioning errors can be achieved for NPC patients undergoing image-guided treatment using Halcyon linear accelerator.
