Effects of different immobilization modes on setup errors for lower limb radiation therapy guided by ExacTrac image guidance system
10.19745/j.1003-8868.2024050
- VernacularTitle:ExacTrac影像引导系统引导下不同固定方式对下肢放射治疗患者摆位误差的影响研究
- Author:
Wei-Juan JIA
1
;
Jun ZHOU
;
Can LUO
;
Yi-Bing ZHOU
Author Information
1. 陆军军医大学第二附属医院肿瘤科,重庆 400037
- Keywords:
ExacTrac image guidance system;
lower limb tumor;
immobilization mode;
radiotherapy;
setup error
- From:
Chinese Medical Equipment Journal
2024;45(3):61-65
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the effects of different immobilization modes on the setup errors for lower limb radiation therapy guided by ExacTrac image guidance system.Methods Totally 145 patients who completed radiation therapy for lower limb tumors at some hospital from October 2019 to November 2022 were selected retrospectively,and then divided into a vacuum negative pressure pad group(Group A,n=46),a thermoplastic membrane group(Group B,n=50)and a thong shoe group(Group C,n=49)based on their immobilization methods.For the three groups of patients the target areas were outlined and the radiotherapy plans were formulated according to unified standards.ExacTrac image guidance system was used for position verification and setup error recording at six directions of anterior-posterior(AP),head-foot(SI),left-right(LR),rotation around AP(Yaw),rotation around SI(Roll)and rotation around LR(Pitch).Results The differences between the 3 groups in LR,AP and Roll directions were all statistically significant(P＜0.05);the setup errors in LR,AP and Roll directions were significantly lower in group B than in the other 2 groups(P＜0.05),and the setup errors in LR and AP directions were significantly lower in group C than in group A(P＜0.05).The setup errors with the three immobilization modes all met clinical requirements after correction.Conclusion Thermoplastic membrane immobilization may enhance the accuracy of body fixation and decrease setup errors during lower limb radiotherapy,and it's recommended be prioritized for body immobilization.[Chinese Medical Equipment Journal,2024,45(3):61-65]
