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Fetal Weight Estimation: Comparison of Two-dimensional US and MR Imaging Assessments.
MedLine Citation:
PMID:  23329652     Owner:  NLM     Status:  Publisher    
Purpose:To prospectively define fetal density in the second half of pregnancy by using magnetic resonance (MR) imaging and to compare estimates of fetal weight based on ultrasonography (US) and MR imaging with actual birth weight.Materials and Methods:Written informed consent was obtained for this ethics committee-approved study. In this cross-sectional study between March 2011 and May 2012, fetal density was calculated as actual birth weight at delivery divided by fetal body volume at MR imaging in 188 fetuses between 20 weeks and 2 days and 42 weeks and 1 day of gestational age. Regression analysis was used to investigate the effect of variables, including sex, on fetal density. The US estimate of fetal weight was performed according to Hadlock et al, and the MR estimate of fetal weight was calculated based on the equation developed by Baker et al. US and MR estimates of fetal weight were compared with actual birth weights by using regression analysis.Results:Median fetal density was equal to 1.04 (range, 0.95-1.18). Fetal density was significantly associated with gestational age at delivery but not with fetal sex. In 26.6% of fetuses, the US estimate of fetal weight had a relative error of more than 10%, while a similar relative error for the MR estimate of fetal weight occurred in only 1.1% of fetuses. The limits of agreement were narrower with the MR estimate of fetal weight compared with the US estimate of fetal weight.Conclusion:In the second half of pregnancy, fetal density varies with gestational age. Fetal weight estimates by using fetal MR imaging are better than those by using prenatal US.© RSNA, 2013.
Yasmine Kacem; Mieke M Cannie; Caroline Kadji; Oana Dobrescu; Leila Lo Zito; Samir Ziane; Brigitte Strizek; Ann-Sophie Evrard; Francesca Gubana; Léonardo Gucciardo; Romuald Staelens; Jacques C Jani
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-17
Journal Detail:
Title:  Radiology     Volume:  -     ISSN:  1527-1315     ISO Abbreviation:  Radiology     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401260     Medline TA:  Radiology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Obstetrics and Gynecology, Fetal Medicine Unit and Department of Radiology, University Hospital Brugmann, Place A. Van Gehuchten 4, 1020 Brussels, Belgium.
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