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Three‐Dimensional Ultrasonographic Bladder Volume Measurement
Author(s) -
Suwanrath Chitkasaem,
Suntharasaj Thitima,
Sirapatanapipat Hemmasak,
Geater Alan
Publication year - 2009
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.7863/jum.2009.28.7.847
Subject(s) - medicine , ultrasonography , volume (thermodynamics) , radiology , quantum mechanics , physics
Objective. The purpose of this study was to investigate the reliability of Virtual Organ Computer‐Aided Analysis (VOCAL; GE Healthcare, Kretztechnik, Zipf, Austria) using the 4 standard rotation steps to measure the bladder volume with 3‐dimensional (3D) ultrasonography. Methods. Using the 4 standard rotation steps of VOCAL, 2 independent observers made 3D volume measurement data sets from the urinary bladder (n = 180). Sets of 30, 20, 12, and 6 planes were obtained from the sequential rotations of 6°, 9°, 15°, and 30°, respectively. The internal contours of the bladders were determined manually. Reliability was evaluated with the intraclass correlation coefficient (ICC), and Bland‐Altman plots were generated to examine bias and agreement. One‐way analysis of variance was used to compare bladder volume measurements between the angles. P < .05 was considered statistically significant. Results. A high degree of reliability was observed between pairs of different rotation angles (ICC, 0.994–0.999). There was good agreement between all pairs of different rotation angles, with percentages of the mean difference ranging from −0.9% to 1.8%. No significant difference was found for bladder volume measurements by the VOCAL technique with varying rotation steps. Intraobserver and interobserver reliabilities were high (ICC, 0.994–0.998). Conclusions. Urinary bladder volume measurement by the VOCAL technique using different rotation steps is highly reliable. A plane rotation of 30° produces the fastest result.