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目的通过对CTsim定位病例的分析,找出使用放疗体位固定膜方法中存在的影响摆位准确性的因素,找到解决办法,提高摆位的准确性和重复性。方法在MEDTEC体模固定板对称中轴上加刻纵向定位参考线,它将和固定板上原有的左右刻度尺一起构成完整的定位参考线组。患者在仰卧到固定板上后对应在体表标记激光定位参考线,然后扣体模,选定扫描参考层,粘贴X线标记点,并拉CT正位平片和侧位平片,对比分析所获得的影像结果。结果57例患者中52例的定位摆位和复位摆位两个过程之间的重复性偏差≤3mm,其他5例重复偏差较大,而且这5例均找到原因并予纠正。结论使用方法是否得当至关重要,笔者研究方法可以获得非常好的摆位重复性。
OBJECTIVE: To analyze the CTsim localization cases and find out the factors affecting the accuracy of placement in the fixed-radiotherapy using the radiotherapy position-fixing film method and to find solutions to improve the accuracy and repeatability of the setup. Method The longitudinal reference line was engraved on the symmetrical central axis of the MEDTEC phantom fixed plate, which together with the original left and right scales on the fixed plate form a complete positioning reference line set. Patient supine to the fixed plate corresponding to the body surface marker laser positioning reference line, and then deducted body mode, the selected scan reference layer, paste the X-ray points, and pull the CT orthoplanas and lateral plain film, comparative analysis The resulting imagery. Results The repeatability deviation between the two procedures was less than 3 mm in 52 patients and the other 5 patients had greater repeatability in 57 patients. All of these 5 patients were found and corrected. Conclusions Whether the method of use is appropriate or not is of crucial importance. The author’s research method can achieve very good placement repeatability.