Comparison of magnetic resonance imaging to ultrasound in the estimation of birth weight at term

Michael V. Zaretsky, Taylor F. Reichel, Donald D. McIntire, Diane M. Twickler

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


OBJECTIVE: This study was undertaken to compare magnetic resonance (MR) and ultrasound (US) fetal weight estimates obtained immediately before delivery with birth weight. STUDY DESIGN: Eighty women scheduled for a cesarean delivery underwent a fast acquisition MR and US for fetal weight estimation within 3 hours of delivery. Prospective MR calculation was based on the equation 0.12 + 1.031 g/mL x fetal volume (ml) = MR weight (g). US fetal weight estimation was calculated by the formula by Hadlock et al. Estimations were compared with birth weight. RESULTS: Correlation (95% Cl) between birth weight and MR weight is 0.95 with a mean absolute error of 129 g (105-155) compared with the correlation between birth weight and US of 0.85 with a mean absolute error of 225 g (186-264). The correlation for birth weight and MR imaging is significantly greater than that of birth weight and US, P < .001. CONCLUSION: Birth weight estimation is more accurate by MR imaging than by US in term infants.

Original languageEnglish (US)
Pages (from-to)1017-1020
Number of pages4
JournalAmerican journal of obstetrics and gynecology
Issue number4
StatePublished - Oct 2003


  • Birth weight
  • Fetus
  • Magnetic resonance imaging
  • Ultrasound

ASJC Scopus subject areas

  • Obstetrics and Gynecology


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