不同距离目标三维超声容积自动测量技术准确度的实验研究

目的：评价对不同距离目标三维超声容积自动测量（ virtual organ computer aided analysis ，VOCAL）技术的准确度。方法应用VOCAL技术对19个不规则不变形水囊模型在距离探头表面1 cm、3 cm、6 cm、9 cm、12 cm处分别作容积自动测量。结果 VOCAL测量不规则水囊在距探头1 cm、3 cm、6 cm、9 cm、12 cm处体积的准确度分别为（99.80±2.63）％、（95.06±3.34）％、（91.37±4.23）％、（88.65±4.44）％、（80.98±9.11）％。系统偏倚（测量差值的平均值）及一致界限（测量差值平均值±2SD）分别为（-0.66±5.18）ml、（-9.07±6.82）ml、（-14.36±6.96）ml、（-21.09±8.39）ml、（-28.37±10.51）ml，相关系数（r）分别为0.992、0.989、0.987、0.981、0.968。结论随目标距离探头数值增加，其测量准确度降低，误差加大，系统偏倚增大，相关系数减小。

A research on the accuracy of automatic three-dimensional ultrasound volume measurement towards targets at different depths

Objective To investigate and evaluate the accuracy of automatic three-dimensional ultrasound volume measure-ment to target different depths .Methods 19 irregular water sacs with fixed sharps were scanned at 1 cm,3 cm,6 cm,9 cm and 12 cm distance away from the surface of the probe using automatic 3DUS volume measurement .Results The accuracy of the volume measure-ments were （99.80 ±2.63）%（1 cm distance）,（95.06 ±3.34）%（3 cm distance）,（91.37 ±4.23）%（6 cm distance）,（88.65 ± 4.44）%（9 cm distance） and （80.98 ±9.11）%（12 cm distance）.The corresponding system biases and limits of arrangement were （-0.66 ±5.18）ml,（-9.07 ±6.82）ml,（-14.36 ±6.96）ml,（ -21.09 ±8.39）ml,and （ -28.37 ±10.51）ml respectively.The correlation coefficients were 0.992,0.989,0.987,0.981,and 0.968 successively.Conclusion The research data indicates that the in-crease of the distance from the targets to the probe will lead to increased measurement errors therefore decreased accuracy .Meanwhile, as the distance increased ,the system bias increases and correlation coefficients will be reduced .