Study of significance of head fixation in the chest wall field combined with supraclavicular field radiotherapy for breast cancer
10.3760/cma.j.issn.1004-4221.2018.05.013
- VernacularTitle:乳腺癌胸壁野结合锁骨上野放疗时头部固定的重要性研究
- Author:
Tao XIE
1
;
Qing XU
;
Jiayuan PENG
;
Yiran MENG
;
Shikuo GUAN
;
Zhaozhi YANG
;
Xin MEI
;
Xiaoli YU
Author Information
1. 复旦大学上海医学院肿瘤学系 复旦大学附属肿瘤医院放射治疗科
- Keywords:
Head fixation;
Multi-functional board;
Set-up error;
Breast neoplasm/radiotherapy
- From:
Chinese Journal of Radiation Oncology
2018;27(5):500-503
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the importance of head fixation in chest wall field combined with supraclavicular field radiotherapy for breast cancer by comparing the displacement error and dosimetric differences caused by multi-functional body board and breast bracket.Methods Thirty patients with breast cancer were randomly divided into groups A and B.In group A,patients were fixed with multi-functional body board and head thermoplastic film.In group B,patients were fixed with traditional breast brackets.Each patient received CBCT scan before and after radiotherapy.Both setup errors and intra-fractional displacements in the x-,y-and z-axis,V100 and V95 were calculated.Statistical analyses were performed using the independent sample t-test.Results The displacement errors in groups A and B before and after radiotherapy were (1.24± 0.42),(1.71± 0.61) and (2.25± 1.04) mm vs.(3.67± 2.05),(3.78± 1.74),(4.65±2.66) mm in the x-,y-and z-axis,respectively (P=0.033,0.027,0.020).The intra-fractional displacements in groups A and B were (1.10±0.66),(1.13±0.59),(1.11 ±0.62) mm vs.(2.48±0.88),(2.21 ±0.98),(3.53±2.01) mm in the x-,y-and z-axis,respectively (P=0.030,0.021,0.013).The V100 in groups A and B were (94.27± 3.20) ％ and (99.08± 0.60) ％ (P =0.065),and (89.48± 4.70) ％ and (96.53± 2.50) ％ for V95 (P =0.002),respectively.Conclusion The risk of displacement error is significantly reduced using multi-functional body board,which enhances the accuracy of radiation dose in chest wall and supraclavicular fields of breast cancer patients.
