Pasto M E, Kurtz A B
Neuroradiology. 1986;28(5-6):380-5. doi: 10.1007/BF00344093.
Since the early 1960s it has been possible to identify the fetal head using A-mode ultrasound. The introduction of high-resolution, real-time, gray-scale ultrasound in the mid-to-late 1970s first enabled the routine display of subtle internal anatomy. Using presently available equipment, the fetus can be imaged from 7 weeks after the last menstrual period until term and the internal anatomy of the fetal head can be detected after 11-12 weeks. The ultrasonic anatomy of the normal fetal head throughout the second and third trimesters is discussed, as are the normal changes taking place with growth.
自20世纪60年代初以来，使用A型超声就可以识别胎儿头部。20世纪70年代中后期高分辨率、实时、灰阶超声的引入，首次实现了对细微内部解剖结构的常规显示。使用目前可用的设备，从末次月经后7周起直至足月都可以对胎儿进行成像，在11 - 12周后可以检测到胎儿头部的内部解剖结构。本文将讨论妊娠中期和晚期正常胎儿头部的超声解剖结构，以及随着生长发生的正常变化。
