数字断层融合技术不同重建方法对肺磨玻璃结节检出影响的研究

Effects of different reconstructions of digital tomosynthesis on pulmonary ground glass nodules detection：an experimerntal study

摘要:

目的：应用胸部仿真体模评价数字断层融合技术（digital tomosynthesis，DTS）不同重建方法对肺磨玻璃结节检出的影响。方法：对置入模拟结节的仿真体模进行DTS扫描后，采用位移叠加法（shift-add，SA）及滤波反投影法（filtered back projec－tion，FBP）2种方法分别重建图像。由2名放射科医师对阳性结节进行计数，分析2种方法对肺结节检出的影响。结果：FBP（thickness++）及SA对肺结节的总检出率分别为71.67%、26.67%，差异有统计学意义（P＜0.05）。FBP 5种重建模式中FBP（thick－ness）的结节检出率稍高于其它4种模式，5种模式的结节检出率差异无统计学意义（P ＞0.05）。结论：DTS是CT及胸片的重要补充，FBP对肺结节检出优于SA。

Abstract:

Objective：To evaluate the effects of different reconstruction methods of digital tomosynthesis on pulmonary ground glass nodules detection using a chest anthropomorphic phantom. Methods：Using the methods of shift-add（SA） and filtered back projection （FBP） to reconstruct image respectively after scanning the phantom implanted with simulation nodules. Two radiologists counted the positive nodules and evaluated the effect of pulmonary nodules detection by two methods. Results：Total detection rates of pulmonary nodules by FBP（thickness++） and SA were 71.67% and 26.67%，with statistically significant difference（P<0.05）. Total detection rates of pulmonary nodules by FBP（thickness） was higher than other four kinds of FBP but without statistically significant differences（P >0.05）. Conclusions：DTS is an important supplement of digital radiography and CT；the method of FBP is better than SA in pul－monary nodule detecting.