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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)
Author(s) -
Papoutsis Dimitrios,
Daskalakis George,
Antonakou Angeliki,
Rodolakis Alexandros,
Mesogitis Spiridon,
Antsaklis Aris
Publication year - 2011
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/jcu.20833
Subject(s) - intraclass correlation , medicine , cylinder , volume (thermodynamics) , ultrasound , reliability (semiconductor) , correlation coefficient , nuclear medicine , reproducibility , mathematics , statistics , geometry , radiology , physics , quantum mechanics , power (physics)
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