Setup error analysis during proton and heavy ion therapy for head and head neck tumor patients with fixation by thermoplastic film combined with styrofoam
10.19745/j.1003-8868.2024132
- VernacularTitle:发泡胶热塑膜组合固定方式下头部及头颈部肿瘤质子重离子治疗中的摆位误差分析
- Author:
Zhu-Lei LIU
1
;
Rui-Rui BU
;
Dan ZHOU
;
Yao LI
;
Ling-Min WU
;
Dong-Peng ZHANG
;
Jiang-Bing ZHANG
;
Dan YOU
Author Information
1. 上海市质子重离子医院放射物理科,上海 201321;上海市放射肿瘤学重点实验室,上海 201321;上海质子重离子放射治疗工程技术研究中心,上海 201321
- Keywords:
fixatoin by thermoplastic film combined with styrofoam;
proton and heavy ion therapy;
head tumor;
head neck tu-mor;
setup error
- From:
Chinese Medical Equipment Journal
2024;45(7):56-61
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the setup errors during proton and heavy ion therapy for head and head neck tumor patients fixed by thermoplastic film combined with styrofoam.Methods Totally 20 patients undergoing proton and heavy ion therapy at some hospital from January to December 2018 were selected retrospectively,of whom 10 ones had head tumors with clinical targets located in the head and the other 10 cases had head and neck tumors with clinical targets distributed in the head and neck.All the 20 patients were fixed with thermoplastic film combined with styrofoam.The head and neck images of the patients acquired after image guidance were aligned with the CT localization-based digitally reconstructed radiograph images,and the setup errors at six-dimensional directions(left-right translation,head-foot translation,forward-backward translation,isocentric rotation,pitch rotation and transverse-roll rotation)were recorded in the first five and the last five times of radiotherapy treatment.The data were processed by using the SPSS 23.0 statistical software and EXCEL.Results There were no significant differences between the head tumor patients in the setup errors at the six directions during the first and last five times of radiotherapy(P＞0.05).The head and neck tumor patients did not have obvious differences in the setup errors at the the directions of left-right translation,forward-backward translation,isocentric rotation and transverse-roll rotation(P＞0.05),while did at the directions of head-foot translation and pitch rotation(P＜0.05).The head and head neck tumor patients with the fixation by thermoplastic film combined with styrofoam had their setup errors at the six directions meet clinical requirements after calibration by the six-dimensional treatment table.Conclusion The fixation mode by thermoplastic film and styrofoam behaves well to enhance the setup repeatability for head tumor patients at the six-dimensional directions,while not so well for head neck tumor patients at the directions of head-foot translation and pitch rotation.Proper measures have to be taken to decrease the setup errors during proton and heavy ion therapy for head and head neck tumor patients.[Chinese Medical Equipment Journal,2024,45(7):56-61]
