实时三维超声测量膀胱容积的初步探讨

Initial study of measuring bladder volume by real-time three-dimensional ultrasound

目的:评价实时三维超声技术测量膀胱容积的准确性与可行性,并探讨测量的最佳旋转角度。方法:使用实时三维超声采集10个模拟膀胱的橡胶水囊及33例正常成人的膀胱“锥形”三维数据库,应用其容积分析软件,用不同旋转角度:6°,9°,15°,30°测量水囊及膀胱容积;同时用二维计算公式测量水囊及膀胱容积,将三维及二维测值与实际值比较。结果:在水囊及成人膀胱容积测量,实时三维超声不同平面间角度与实际值均呈正相关(r2>0.90),两者无显著性差异(P>0.05);二维超声测值与实际值虽呈正相关(r2>0.85),但两者间有显著性差异(P<0.05)。各旋转角度之间相比较,水囊及膀胱容积测量时不同旋转角度之间无显著性差异(P>0.05);实时三维超声测量误差较二维超声明显为小(P<0.05)。结论:实时三维超声技术测量膀胱容积准确可靠,重复性高。临床应用实时三维超声测量膀胱容积时,选择平面间角度30°即可提供足够信息,为兼顾准确与简便的最佳选择。

Objective: To investigate the accuracy and feasibility for the quantitative of bladder volume with the real-time three-dimensional ultrasound(RT-3DUS) and to probe which is the best method of different rotation of inter-plan angles. Methods: Ten rubber-bursa like bladder and 33 bladders of healthy volunteers underwent real-time three-dimensional ultrasound, and volume were calculated with different inter-plan angles(6°, 9°, 15°, 30°) with the analysis software of real-time three-dimensional ultrasound. At the same time, the volume was measured with two-dimensional ultrasound(2DUS). These were compared with the true volume. Results: Measurements of real-time three-dimensional ultrasound correlated well with actual volumes(r2>0.90), and there was no significant difference between them(P>0.05); though correlated with actual volumes(r2>0.85), measurements of two-dimensional ultrasound had significant difference from actual volumes(P<0.05). In rubber-bursae and bladders of volunteers, there was no significant difference between different inter-plan angles. Measurement errors of real-time three-dimensional ultrasound were less than those of two-dimensional ultrasound significantly. Conclusion: Real-time three-dimensional ultrasound can accurately, and reliably determine bladder volume. For bladder volume, 30° inter-plane angle method was the best choice for diagnosing accuracy and convenience.