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THE THEORY, FEASIBILITY AND ACCURACY OF AN ULTRASONIC METHOD OF ESTIMATING FETAL WEIGHT *
Author(s) -
Morrison J.,
McLennan M. J.
Publication year - 1976
Publication title -
bjog: an international journal of obstetrics and gynaecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.157
H-Index - 164
eISSN - 1471-0528
pISSN - 1470-0328
DOI - 10.1111/j.1471-0528.1976.tb00756.x
Subject(s) - biparietal diameter , fetal weight , ultrasonic sensor , ultrasound , correlation coefficient , fetus , medicine , mathematics , statistics , obstetrics , biomedical engineering , radiology , birth weight , pregnancy , biology , genetics , head circumference
Summary We present the theory, method, feasibility and accuracy of estimating fetal weight by measuring the fetal volume using compound ultrasonic scanning. The two parameters had a very high coefficient of correlation (0.9794), and the standard error in one series of 20 patients was only ±106 g. The correlation coefficient achieved by one of us who was new to ultrasound techniques was 0.82, which compared favourably with correlations between fetal weight and biparietal diameter measurements (r = 0.26). A discussion as to the correction factors required to allow for the unknown value of the velocity of ultrasound in fetal tissues, the clinical use of this method, and the possible means by which the accuracy of estimating fetal weight may be further improved is included.