Adam A H, Robinson H P, Dunlop C
Br J Obstet Gynaecol. 1979 Jul;86(7):521-4. doi: 10.1111/j.1471-0528.1979.tb10803.x.
In a series of 168 patients in the first trimester of pregnancy, fetal crown-rump length (CRL) measurements were attempted in the Antenatal Clinic using a linear-array real-time ultrasound scanner. The measurements could not be made in 23 of the patients; most of them had a gestational age of less than 10 weeks and the difficulty in obtaining measurements was usually due to an underfilled maternal bladder. When compared with CRL measurements obtained with a conventional B-scanner, a good correlation was obtained (r = 0.92); 80 per cent of the 'real-time' values fell within a range of +/- 5 mm of the conventional values. In all patients the estimates of gestational age using the two methods were within one week of each other.
在168例妊娠早期患者中，尝试在产前诊所使用线性阵列实时超声扫描仪测量胎儿头臀长（CRL）。23例患者无法进行测量；其中大多数患者的孕周小于10周，测量困难通常是由于孕妇膀胱未充盈。与使用传统B型扫描仪获得的CRL测量值相比，两者具有良好的相关性（r = 0.92）；80%的“实时”测量值落在传统测量值±5毫米的范围内。在所有患者中，使用这两种方法估计的孕周相差在一周以内。
