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Evaluation of gallbladder volume and emptying with a novel three‐dimensional ultrasound system: Comparison with the sum‐of‐cylinders and the ellipsoid methods

Evaluation of gallbladder volume and emptying with a novel three‐dimensional ultrasound system:... To overcome the geometrical limitations of current methods to calculate gallbladder volume from two‐dimensional sonographic images, we evaluated the accuracy and precision of a novel three‐dimensional ultrasound system (3D). In vitro accuracy of 3D volumetry (10 mL to 55 mL) was 98.1 ± 7.1% (mean ± SD) with a mean difference of 0.7 mL between the measured and the true volume (p < 0.003). Compared with the sum‐of‐cylinders (SC) and the ellipsoid (EL) methods, 3D was characterized by a significantly smaller systematic bias and closer limits of agreement with the true volume. The variation coefficient was smallest with 3D (2.4%, p < 0.02) and largest with EL (4.2%). In vivo, gallbladder volumes were on average 1.4 mL (9%) smaller with 3D than with SC (p < 0.0001) and 2.4 mL (14%) larger with EL than with SC (p < 0.0001). 3D ultrasonography accurately measures gallbladder volume and emptying. © 1996 John Wiley & Sons, Inc. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Clinical Ultrasound Wiley

Evaluation of gallbladder volume and emptying with a novel three‐dimensional ultrasound system: Comparison with the sum‐of‐cylinders and the ellipsoid methods

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References (44)

Publisher
Wiley
Copyright
Copyright © 1996 John Wiley & Sons, Inc.
ISSN
0091-2751
eISSN
1097-0096
DOI
10.1002/(SICI)1097-0096(199607/08)24:6<277::AID-JCU1>3.0.CO;2-F
pmid
8792267
Publisher site
See Article on Publisher Site

Abstract

To overcome the geometrical limitations of current methods to calculate gallbladder volume from two‐dimensional sonographic images, we evaluated the accuracy and precision of a novel three‐dimensional ultrasound system (3D). In vitro accuracy of 3D volumetry (10 mL to 55 mL) was 98.1 ± 7.1% (mean ± SD) with a mean difference of 0.7 mL between the measured and the true volume (p < 0.003). Compared with the sum‐of‐cylinders (SC) and the ellipsoid (EL) methods, 3D was characterized by a significantly smaller systematic bias and closer limits of agreement with the true volume. The variation coefficient was smallest with 3D (2.4%, p < 0.02) and largest with EL (4.2%). In vivo, gallbladder volumes were on average 1.4 mL (9%) smaller with 3D than with SC (p < 0.0001) and 2.4 mL (14%) larger with EL than with SC (p < 0.0001). 3D ultrasonography accurately measures gallbladder volume and emptying. © 1996 John Wiley & Sons, Inc.

Journal

Journal of Clinical UltrasoundWiley

Published: Jul 1, 1996

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