Zaretsky Michael V, Reichel Taylor F, McIntire Donald D, Twickler Diane M
Department of Obstetrics and Gynecology, The University of Texas Southwestern Medical Center at Dallas, 75390-9032, USA.
Am J Obstet Gynecol. 2003 Oct;189(4):1017-20. doi: 10.1067/s0002-9378(03)00895-0.
This study was undertaken to compare magnetic resonance (MR) and ultrasound (US) fetal weight estimates obtained immediately before delivery with birth weight.
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/mLxfetal volume (mL)=MR weight (g). US fetal weight estimation was calculated by the formula by Hadlock et al. Estimations were compared with birth weight.
Correlation (95% CI) 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.
Birth weight estimation is more accurate by MR imaging than by US in term infants.
本研究旨在比较分娩前即刻通过磁共振成像（MR）和超声（US）获得的胎儿体重估计值与出生体重。
80名计划剖宫产的女性在分娩后3小时内接受了快速采集的MR和US检查以估计胎儿体重。前瞻性MR计算基于公式0.12 + 1.031 g/mL×胎儿体积（mL）= MR体重（g）。US胎儿体重估计采用Hadlock等人的公式计算。将估计值与出生体重进行比较。
出生体重与MR体重之间的相关性（95%CI）为0.95，平均绝对误差为129 g（105 - 155），而出生体重与US之间的相关性为0.85，平均绝对误差为225 g（186 - 264）。出生体重与MR成像的相关性显著高于出生体重与US的相关性，P <.001。
对于足月儿，通过MR成像估计出生体重比通过US更准确。
