Jeanty P, d'Alton M, Romero R, Hobbins J C
Am J Perinatol. 1986 Oct;3(4):289-95. doi: 10.1055/s-2007-999882.
Although various techniques have been described to aid in the ultrasound diagnosis of placenta previa and incompetent cervix, these maneuvers depend on the precise identification of the internal cervical os, a feat which is notoriously difficult to accomplish consistently. In an attempt to get a closer view of the cervix we tried another approach. This simple technique of perineal scanning has the potential to help considerably with these problems.
尽管已经描述了多种有助于超声诊断前置胎盘和宫颈机能不全的技术，但这些操作依赖于对宫颈内口的精确识别，而这一目标一直以来都极难始终如一地实现。为了更清晰地观察宫颈，我们尝试了另一种方法。这种简单的会阴扫描技术有可能极大地帮助解决这些问题。
