Three‐dimensional ultrasound: accuracy of distance and volume measurements

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Abstract
The aim of this study was to evaluate the accuracy of three‐dimensional ultrasound distance and volume measurements using a commercially available three‐dimensional ultrasound scanner. Sixty‐two distance measurements were performed twice on an ultrasound tissue‐mimicking phantom located in a water bath. Three‐dimensional ultrasound distance measurements were compared to the actual distance. Volume measurements were made in a water bath with 21 balloons of various shapes ranging in volume from 20 ml to 490 ml. Three‐dimensional ultrasound volume measurements were compared to actual balloon volumes and to conventional two‐dimensional ultrasound volume calculations. The mean absolute error in three‐dimensional ultra‐sound distance measurements was 1.0 ± 0.8% (range, −2.3 to 4.9%) in the plane of acquisition and 1.0 ± 0.6% (range, −2.0 to −0.2%) for planes with other orientations. Three‐dimensional ultrasound volume measurements showed a mean absolute error of 6.4 ± 4.4% (range, −6.0% to +15.5%), which was considerably better than two‐dimensional ultrasound volume estimates having a mean absolute error of 12.6 ± 8.7% (range, −27.5% to +39.2 %). Volume measurements using two‐dimensional ultrasound methods were much less accurate than three‐dimensional ultrasound methods, for irregularly shaped objects. In conclusion, our data show (that three‐dimensional ultrasound measurements of distance and volume are sufficiently accurate to use clinically. Copyright © 1996 International Society of Ultrasound in Obstetrics and Gynecology

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