摘要CT模拟定位是以CT图像为基础的放疗模拟定位技术，可以建立三维坐标系，精确显示肿瘤大小、侵犯范围及淋巴结转移情况，可以精确显示周边重要器官轮廓、肿瘤和重要器官之间相互位置关系，为放疗计划设计提供电子密度，是精确放疗的基础条件之一。为规范CT模拟定位临床操作技术、精确肿瘤靶区勾画和计划设计提供放疗定位质量保证，特制定本专家共识。本共识内容包括CT模拟应用概述、常见肿瘤CT模拟定位规范共识、CT模拟定位技术常用后处理、呼吸运动管理技术、CT模拟不良反应及处理和CT模拟展望等，以期指导放射治疗师、放射肿瘤医师临床实践，为患者带来生存获益。

abstractsCT-simulation positioning is a radiotherapy simulation positioning technology based on CT images, which can establish a three-dimensional coordinate system, accurately display tumor size, scope of invasion and lymph node metastasis, precisely display the contour of surrounding vital organs and the relationship between tumor and vital organs, providing electron density for the design of radiotherapy plan, which is one of the basic conditions of precise radiotherapy. Chinese Expert Consensus on Clinical Operation Guidelines of CT Simulation Positioning Technology was formulated to standardize clinical operation technology of CT simulation positioning and provide quality assurance for precise tumor target delineation and planning design. This consensus includes overview of application of CT simulation, consensus on CT simulation positioning of common tumors, common post-processing of CT simulation positioning technology, respiratory movement management technology, adverse reactions and processing of CT simulation, prospect of CT simulation, aiming to guide clinical practice of radiation therapists and radiation oncologists and bring survival benefits to patients.