Obiective To study the regularity of three-dimensional displacement in respiration of lung cancer. Methods Af-ter CT scanning, the CT images were transferred into target planning system (TPS) to obtain three-dimensional reconstruc-tion images. Then target drawing and noting of target position, tumor volume, lung function, patient gender, age and weight were performed. The images during the course of inspiration and expiration in simulator were scanned and transferred into TPS by DICOM RT port. At last, the three-dimensional displacement curve of the interested points(X,Y and Z axis) could be obtained. Results The three-dimensional real time displacement curve of lung cancer interested points could be estab-fished by the way of collecting simulator images and drawing interested points. The maximum displacement range of the interested points were 4.2mm in Z-axis(head-foot direction), 3.8ram in X-axis(left-right direction), 2.9ram in Y-axis(ante-rior-posterior direction). Conclusion The three--dimensional real time displacement curve of lung cancer at any point of the target can be established by collecting the dynamic images in simulator and reconstructing of the corresponding images in target planning system through the DICOM RT.%目的:研究肺部肿瘤受呼吸运动影响发生三维位移的规律.方法:肺癌患者在CT扫描结束后,将图像输入计划系统进行三维重建.勾画靶区.记录患者的靶区住置、肿瘤体积、肺功能、性别、年龄、体重等相关参数.在模拟机下从0°和90°分别拍摄患者的吸气和呼气图像,将图像用Dicom RT接口存储并传输到计剐系统,将图像序列重建后进行靶区勾画.三维重建后可得到感兴趣点在X、Y、Z三维方向的位移曲线.结果:用采集模拟机图像序列和感兴趣点勾画的方法,建立了肺部肿瘤上感兴趣点的三维实时位移曲线.此点在Z轴(头脚方向1的最大位移幅度为4.2 mm,在X轴(左右方向)的最大位移幅度为3.8 mm,在Y轴(前后方向)的最大位移幅度为2.9mm.结论:用模拟机采集肺部肿瘤的动态图像,通过DICOM RT接口传至放疗计划系统重建,可以建立靶区上任意点的三维实时位移曲线.
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