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Estimation of the amniotic fluid volume using the Cavalieri method on ultrasound images
Author(s) -
Sahin B,
Alper T,
Kökçü A,
Malatyalioglu E,
Kosif R
Publication year - 2003
Publication title -
international journal of gynecology and obstetrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 97
eISSN - 1879-3479
pISSN - 0020-7292
DOI - 10.1016/s0020-7292(03)00122-x
Subject(s) - ultrasound , amniotic fluid , volume (thermodynamics) , mean squared error , coefficient of determination , mathematics , biomedical engineering , nuclear medicine , medicine , physics , statistics , pregnancy , radiology , fetus , biology , quantum mechanics , genetics
Objectives: Presently, a design‐based and practical method for measuring amniotic fluid volume (AFV) for routine clinical examinations has not been proposed. In this study we describe a new method, which combines the Cavalieri method with ultrasound imaging to estimate AFV. Methods: We measured the AFVs of 14 women in the third trimester of pregnancy, and repeated our measurements three times for each woman. Parallel planimetric ultrasonographic images were obtained at every 2 cm along the longitudinal uterine axis. AFVs were calculated as the total of the multiples of the estimated cut surface areas by the section thickness. Results: The mean estimated AFV was 380.5 cm 3 . The coefficient of error of each measurement was calculated and the mean was 0.108. The coefficient of correlation between the amniotic fluid index and our AFV estimations was 0.87. Conclusions: Design‐based and efficient estimation of AFV is possible with the combination of consecutive ultrasound images and the Cavalieri method.