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肺部肿瘤在放疗中随呼吸运动和心脏搏动 ,其在三维空间的位置会随时间变化而改变。CT模拟定位的扫描方式是一种螺旋向前的断层扫描方式 ,它的影像只是反映肺部肿瘤在某一特定时间内所处的相对位置 ,不能反映肺部肿瘤全面的活动情况 ,因此在临床应用中受到质疑[1] ;而门控技术及
Pulmonary tumors in the radiotherapy with respiratory motion and heart beat, its position in the three-dimensional space will change over time. The CT scanning mode is a spiral forward tomography. Its image reflects the relative position of the lung tumor at a specific time and does not reflect the overall tumor activity in the lung. Therefore, in the clinical Applications have been questioned [1]; while gating technology and