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Research Article
Sonographic measurement of cervical volume in nonpregnant women using the geometric formula for a cylinder versus the three-dimensional automated virtual organ computer-aided analysis (vocal)
Article first published online: 4 MAY 2011
DOI: 10.1002/jcu.20833
Copyright © 2011 Wiley Periodicals, Inc.
Additional Information
How to Cite
Papoutsis, D., Daskalakis, G., Antonakou, A., Rodolakis, A., Mesogitis, S. and Antsaklis, A. (2011), Sonographic measurement of cervical volume in nonpregnant women using the geometric formula for a cylinder versus the three-dimensional automated virtual organ computer-aided analysis (vocal). Journal of Clinical Ultrasound, 39: 322–328. doi: 10.1002/jcu.20833
Publication History
- Issue published online: 3 JUN 2011
- Article first published online: 4 MAY 2011
- Manuscript Accepted: 7 MAR 2011
- Manuscript Received: 2 JUL 2010
- Abstract
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Keywords:
- uterine cervix;
- ultrasound;
- volume measurement;
- cylinder geometric formula;
- VOCAL
Abstract
Background.
To sonographically evaluate the volume of uterine cervix in nonpregnant women with use of the geometric formula for a cylinder and to assess agreement with the reference Virtual Organ Computer-Aided AnaLysis (VOCAL) method.
Methods.
Three-dimensional ultrasound volume datasets of the uterine cervix from 81 women were obtained prospectively within a 1-year period. Volume measurements were performed using VOCAL and the geometric formula for a cylinder. Reliability was evaluated using intraclass correlation coefficient and Bland-Altman plots were produced to examine intermethod agreement. Time needed to perform measurements was compared with Student's t test.
Results.
There was good agreement between VOCAL and the geometric formula for a cylinder (mean percentage difference, −0.78%; 95% limits of agreement, −17.59–16.03%). Measurements made by the formula for a cylinder were slightly greater than VOCAL by a mean (±SE) of 0.78% (±0.95%). A high degree of reliability was observed between the two methods (intraclass correlation coefficient, 0.97; 95%CI, 0.95–0.98). Cervical volume estimation with the geometric formula for a cylinder was faster to obtain.
Conclusions.
This method comparison study shows that the geometric formula for a cylinder has good agreement with VOCAL and can determine the volume of the cervix in a faster way. © 2011 Wiley Periodicals, Inc. J Clin Ultrasound, 2011