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)
✍ Scribed by Dimitrios Papoutsis; George Daskalakis; Angeliki Antonakou; Alexandros Rodolakis; Spiridon Mesogitis; Aris Antsaklis
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 441 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0091-2751
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✦ Synopsis
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