摘要目的：探讨基于磁定位三维超声-超声(3DUS-US)单模态图像自动融合技术的准确性及可行性。方法制作实验大体模型,利用自由臂三维超声与实时超声进行图像自动融合,并设计慢速组与快速组,观察自由臂三维超声不同扫查速度对图像融合效果的影响；另外,由两名经验不同的操作者分别进行3DUS-US 图像自动融合,记录融合所需时间及配准误差,分析不同操作者之间的重复性。结果大体模型的外观、稳定性及超声图像质量均满足实验要求。3DUS-US 图像自动融合成功率100%(40/40),慢速组图像融合配准误差(1.44±0.64)mm,明显低于快速组的(2.56±0.53)mm,差异有统计学意义(P <0.001)。两名操作者图像融合配准误差及融合时间比较差异均无统计学意义(P =0.508,P =0.517)。结论基于磁定位3DUS-US 图像自动融合技术准确、可行,可应用于临床。

abstractsObjective To evaluate the feasibility and accuracy of three-dimensional ultrasound-ultrasound (3DUS-US)automatic image fusion technology based on electromagnetic positioning.Methods The experimental phantom was constructed to acquire ultrasonic images by agarose gel and additives,which was used as the experimental object.3DUS imaging with free-hand and real-time ultrasound imaging automatic registrations were performed based on electromagnetic positioning.To investigate the effect of 3DUS-US image fusion under different scanning speed by free-hand,the fast and slow groups were designed. In addition,a junior operator and a senior operator performed 3DUS-US automatic registrations,and recorded the operating time and registration error,respectively.The repeatability between two operators was analyzed.Results The macroscopic appearance,stability and ultrasonic image of the phantom met the demand of this research.The success rate of 3DUS-US automatic image fusion technology was 100%(40/40).The slow group's registration error distance was (1 .44 ± 0.64)mm,which was obviously lower than the fast group's (2.56±0.53)mm,the difference was statistically significant (P <0.001).There were no statistically differences of the registration error and operating time between the two operators (P =0.508,P = 0.5 1 7 ).Conclusions The technology of 3DUS-US automatic registration based on electromagnetic positioning was feasible and accurate,which is worth applying into the clinical treatment.