Abstract

Info

Title:: Analyzing the deformation of head-neck-shoulder thermoplastic mask by OPS-based early warning system for setup errors in radiotherapy

Author(s):: HUANG Xinyang1; ZHOU Jundong2; WU Chuanfeng2; CHU Yaohua2; HU Rui2; GE Yun1; 1. School of Electronic Science and Engineering, Nanjing University, Nanjing 210046, China 2. Suzhou Municipal Hospital, Suzhou 215000, China

Keywords:: Keywords: radiotherapy optical positioning systemearly warning system for setup errors in radiotherapy thermoplastic mask deformation setup error head and neck tumors

Abstract:: Abstract: Objective To study the deformation degree of head-neck-shoulder thermoplastic mask by analyzing the data such as the deformation degrees of membrane balls collected by optical positioning system (OPS) during positioning. Methods Twenty-three patients with head and neck cancer were randomly enrolled in the study. All the patients were immobilized with head-neck-shoulder thermoplastic mask. OPS was used to monitor the 6 positioning balls on the thermoplastic mask in real time, and the deformation degree of each membrane ball during positioning was recorded. When the deviation of the deformation of the membrane ball was less than 1.0 mm, it was deemed to be within the normal range and did not affect the positioning accuracy. Results The proportions of the deviations of the 6 positioning balls within 1.0 mm were 70.3%, 62.0%, 57.4%, 61.8%, 70.5% and 65.5% respectively. Conclusion OPS-based early warning system for setup errors in radiotherapy can monitor whether the thermoplastic mask is deformed in real time. The experimental results reveal that the occurrence of thermoplastic mask deformation is relatively high, which affects the positioning accuracy.The early warning system can effectively improve the accuracy of radiotherapy positioning by detecting the deformation of thermoplastic mask in time, with high clinical value.