Gerstner G, Reinold E, Wolf G
Wien Med Wochenschr. 1979 Dec 30;199(24):699-702.
334 ultrasound-cephalometries and 231 X-ray fetographies were performed for antenatal assessment of fetal maturity as well as for exact estimation of gestational age in women with unknown date of donfinement. The accurance of the predictions was compared. Ultrasound-cephalometry gave best results when performed until the 20th week of gestation. A correct prediction was obtained in 80.4% of cases. After the 20th week of gestation, the accuracy of prediction decreased. Radiology on the contrary gave optimal results at the end of pregnancy. A correct prediction of the date of confinement was obtained in 73.8% of cases, when the X-ray fetography was performed between the 37th and 40th week of gestation. At the end of gestation radiography should be performed, if there is a discrepancy between ultrasound and clinical estimation or if ultrasound-cephalometry was not carried out in early pregnancy--especially if induction of labour is necessary.
为评估胎儿成熟度以及准确估算末次月经日期不明的孕妇的孕周，进行了334次超声头测量和231次X线胎儿摄影。比较了两种预测方法的准确性。超声头测量在妊娠20周前进行时效果最佳，80.4%的病例预测正确。妊娠20周后，预测准确性下降。相反，放射学检查在妊娠末期效果最佳。在妊娠37至40周进行X线胎儿摄影时，73.8%的病例能正确预测分娩日期。在妊娠末期，如果超声检查与临床估计有差异，或在孕早期未进行超声头测量——尤其是需要引产时，应进行放射学检查。
