中国医疗设备2018，Vol.33Issue(7)：30-32,3.DOI:10.3969/j.issn.1674-1633.2018.07.007
肿瘤放疗热塑膜伸缩特性的测试
Measurement of the Shrinkage of Thermoplastic Mask in Radiation Therapy
摘要
Abstract
Objective Radiotherapy thermoplastic mask has been widely used in tumor radiotherapy localization. This study analyzed the impact of the shrinkage of thermoplastic mask on target positioning accuracy. Methods The shrinkage of radiotherapy thermoplastic mask in free state was measured as following. Firstly, the thermoplastic mask with the specification of 100 mm×100 mm×3.2 mm was heated and stretched in a straight direction at a certain tensile ratio. Then the length of thermoplastic mask was measured at different time after stretching, and the shrinkage amplitude of thermoplastic film was analyzed with time. The relationship between different tensile ratios and contraction amplitude was analyzed according to different tensile ratios. Results The shrinkage amplitude of thermoplastic mask after thermal stretching increased approximately linearly in the first 20 minutes, and reached the maximum at the first 20 minutes. The length of thermoplastic mask remained stable after half an hour. The shrinkage of thermoplastic mask was constant within the range of 1.5-3.0, which was commonly used in clinical practice. The average shrinkage rate was 1.5%±0.1%. Conclusion The shrinkage of thermoplastic mask changed the most within 20 minutes after the stereotyping, indicating that the cooling time should not be less than 20 minutes when radiotherapy thermoplastic mask is made for patients. The shrinkage extent of thermoplastic mask is related to the tensile degree of the film, which indicates that it should be uniformly stretched to avoid excessive or too small tensile ratio.关键词
放疗热塑膜/收缩幅度/拉伸比率/定位精度Key words
thermoplastic mask/shrinkage amplitude/stretching ratio/positioning accuracy分类
医药卫生引用本文复制引用
张寅,李明辉,罗京伟..肿瘤放疗热塑膜伸缩特性的测试[J].中国医疗设备,2018,33(7):30-32,3.基金项目
国家重点研发计划精准医学研究专项子课题(2016YFC0904603). （2016YFC0904603）
