胰腺在普通X线钡餐透视下仅部分胰头与十二指肠有较好的对比,其余部位因无理想的对比,在模拟机下定位有困难。B超的体表标志亦很难准确建立。依CT图象可以较准确地将胰腺肿瘤投影在腹壁上,进行放疗照射野的设计。从1987年10月至1992年1月,我们依据全身CT扫描片测量并在病人体表投影实际复原进行定位,取得了较好的放疗效果,总结如下。 Pancreas in the normal X-ray barium meal perspective only part of the pancreas head and duodenum have a good contrast, the remaining parts due to no ideal contrast, difficult to locate under the simulator. It is also difficult to establish accurate B-surface marks. According to the CT images, pancreatic tumors can be accurately projected on the abdominal wall and radiotherapy radiation fields can be designed. From October 1987 to January 1992, we took measurements based on whole-body CT scans and located the actual reconstruction of the patient’s body surface to achieve better radiotherapy outcomes, summarized as follows.