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Accuracy of prostate volume measurements in vitro using three-dimensional ultrasound
T L Elliot1, D B Downey, S Tong
1Department of Diagnostic Radiology and Nuclear Medicine, University Hospital, University of Western Ontario, London, Canada.
Rationale And Objectives:
We assessed the ability of a three-dimensional (3D) ultrasound imaging system to measure accurately prostate volume.
Methods:
Multiple two-dimensional ultrasound images of cadaver prostates scanned in a water bath were reconstructed into three-dimensional (3D) images. The volumes of the prostates were calculated from these 3D images and compared with the actual volumes. Multiple 3D ultrasound volume readings were evaluated for precision.
Results:
The slope of the best-fit line correlating 3D ultrasound estimated volume and true volume was 1.006 +/- 0.007. The average error was 0.36 +/- 1.17 cm3; the coefficient of determination (r2), which is the measure of the straight-line relationship, was .9997; and the standard error was 1.15 cm3.
Conclusion:
Three-dimensional ultrasound images accurately reflect true prostate volumes measured in vitro.