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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
Author(s) -
Pauletzki Jürgen,
Sackmann Michael,
Holl Joseph,
Paumgartner Gustav
Publication year - 1996
Publication title -
journal of clinical ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.272
H-Index - 61
eISSN - 1097-0096
pISSN - 0091-2751
DOI - 10.1002/(sici)1097-0096(199607/08)24:6<277::aid-jcu1>3.0.co;2-f
Subject(s) - gallbladder , 3d ultrasound , ellipsoid , medicine , ultrasound , ultrasonography , volume (thermodynamics) , limits of agreement , nuclear medicine , mean difference , coefficient of variation , radiology , mathematics , surgery , statistics , confidence interval , physics , quantum mechanics , astronomy
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.