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目的:评价视觉反馈呼吸训练模块在左侧乳腺癌深吸气屏气放射治疗中的应用。方法:30例左侧乳腺癌保乳术后拟行全乳放疗患者经宣教培训后全部符合深吸气屏气要求，使用主动呼吸控制设备控制屏气状态行CT定位。将其随机分为使用(A组)和未使用(B组)视觉反馈呼吸训练方法两组各15例。A组使用光学体表监测系统的视觉反馈呼吸训练模块实现，B组使用音频互动方法指导患者屏气。通过分析光学体表实时治疗数据，比较两组患者不同治疗分次间呼吸的可重复性以及一个分次内多次屏气的稳定性，两组患者完成治疗所需屏气次数以及治疗时间。使用GraphPad Prism 6.0软件进行数据处理和作图，使用SPSS 21.0软件进行均值分析和正态性检验。结果:视觉反馈呼吸训练方法使患者的可重复性从1.5 mm降至0.7 mm (n P<0.05)，稳定性从1.1 mm降至0.8 mm (n P<0.05)，治疗所需屏气次数平均从4.6次降至2.4次(n P<0.05)，平均出束时间和总治疗时间分别从336 s和847 s降至235 s和602 s (n P<0.05)。n 结论:基于视觉反馈的呼吸训练模块可以提高左侧乳腺癌深吸气屏气放疗的可重复性和稳定性，有效减少憋气次数和治疗时间。“,”Objective:To evaluate the application of visual feedback coaching method, which is embedded in an optical surface monitoring system, in deep inspiration breath holding during the radiotherapy in left breast cancer patients after breast-conserving surgery.Methods:Thirty patients with left breast cancer, who were scheduled to receive the whole breast radiotherapy after breast-conserving surgery, met the requirements of deep inspiration breath holding after respiratory coaching with the visual feedback coaching module in the optical surface monitoring system. Active breathing control equipment was used to control breath-holding state and CT simulation was performed. During treatment, optical surface monitoring system was used to guide radiotherapy. All patients were randomly divided into two groups. In group A (n n=15), visual feedback respiratory training method was utilized and not employed in group B (n n=15). In group A, the visual feedback coaching bar of the optical surface monitoring system was implemented, while audio interactive method was employed to guide patients to hold their breath. Real-time data of optical body surface monitoring were used to compare the interfraction reproducibility and intrafraction stability of breath holding fraction between two groups. Besides, the number of breath holding and treatment time per fraction were also compared. GraphPad prism 6.0 software was used for data processing and mapping, and SPSS 21.0 software was used for analyzing mean value and normality testing.n Results:Compared with the control group, the reproducibility in the experiment group was reduced from 1.5 mm to 0.7 mm, the stability was reduced from 1.1 mm to 0.8 mm, the mean number of breath holding required per fraction was decreased from 4.6 to 2.4, the mean beam-on time per fraction from 336 s to 235 s, and the treatment time per fraction was shortened from 847 s to 602 s (all n P<0.05), respectively.n Conclusions:The application of visual feedback coaching method can improve the reproducibility and stability of breath holding during radiotherapy for left breast cancer, and it can also effectively reduce the number of breath holding and shorten the treatment time per fraction.