三维超声-二维超声、CT-二维超声磁定位图像融合技术的比较

摘要

目的：比较分析三维超声-二维超声(3DUS-US)与 CT-二维超声(CT-US)磁定位图像融合技术的准确性、简便性及可重复性。方法建立仿组织体模,两位不同经验操作者分别进行3DUS-US、CT-US 图像融合,各重复操作10次,分别记录图像融合成功率、融合时间和配准误差,并比较上述指标在两位操作者、两种技术之间的差异。结果体模的超声、CT 图像及其稳定性均满足实验要求。3DUS-US、CT-US 融合均获得成功,3DUS-US 融合的配准误差(1.70±0.42)mm、融合时间(76.00±9.99)s 均明显优于 CT-US (P =0.014,P <0.001)。3DUS-US 融合配准误差、融合时间在两位操作者之间的比较差异均无统计学意义(P =0.508,P =0.517)；而 CT-US 融合的配准误差在经验者明显低于初学者(P =0.009),融合时间两位操作者间差异则无统计学意义(P =0.234)。结论磁定位3DUS-US 图像自动融合技术在体模试验中较 CT-US 图像融合具有操作简便、无经验依赖等优势,更适合在临床上应用推广。%Objective To compare the accuracy,convenience and repeatability of 3DUS-US and CT-US image fusion technology based on electromagnetic positioning.Methods A tissue-mimicking phantom was established and used to obtain ultrasound or CT volume images.Two different operators performed 3DUS-US and CT-US image fusion and repeated 10 times,respectively.The success rate,the registration error distance and fusion time of two techniques were recorded and compared between the different operators.Results The ultrasound and CT images of the phantom and its stability could meet the demands of this experiment.3DUS-US and CT-US image fusions were successful.The registration error distance of 3DUS-US image fusion was (1 .70 ± 0.42)mm and fusion time was (76.00 ± 9.99)s,they were obviously superior to CT-US (P = 0.014,P < 0.001 ).There were no significant differences between the two operators in the registration error distance and fusion time of 3DUS-US (P =0.508,P =0.5 1 7).But the registration error distance of CT-US image fusion in experienced operator was lower than the junior (P =0.009),and fusion time had not statistical difference between the two operators (P =0.234).Conclusions The technique of 3DUS-US automatic image fusion based on electromagnetic positioning has advantages of convenience and no experiential dependence comparing with CT-US in the phantom experiments,so it is worthy of being widely popularized in clinical application.