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Journal of Ultrasound in Medicine, Vol 15, Issue 9 627-632, Copyright © 1996 by American Institute of Ultrasound in Medicine
In vivo three-dimensional sonographic measurement of organ volume: validation in the urinary bladder
M. Riccabona, T. R. Nelson, D. H. Pretorius and T. E. Davidson
Department of Radiology, University of California, San Diego, La Jolla 92093-0610, USA.
The purpose of this study was to assess the accuracy of in vivo measurement
of organ volume using 3DUS and compare the results to 2D sonographic
methods using the urinary bladder as the target organ and voided urine
volume for validation. Fifty normal volunteers were studied. 2D volume
measurements were based on length, width, and depth data and assumed a
regular geometric model. 3D volume measurements were based on masked slices
with the voxels integrated over the entire bladder. Voided urine volumes
ranged from 35 ml to 701 ml. Residual urine volume was present in 48% of
the subjects and ranged from 1% to 14% of the voided volume. 2D volume
estimates for all 50 subjects had a mean absolute value of the error of
27.5% +/- 17.8%. 3D volume measurements had a mean absolute value of the
error of 4.3% +/- 3.7% (transverse) and 5.6% +/- 3.8% (longitudinal). 3DUS
provided more accurate volume measurements than 2DUS, particularly for
irregularly shaped organs.
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