Harwood S J, Pinsker M C
South Med J. 1979 Feb;72(2):223-5. doi: 10.1097/00007611-197902000-00025.
Anencephaly can be diagnosed using real-time ultrasonography. This enables visualization of the fetal movements and facilitates identification of the fetal parts, making certain the exact orientation of the fetus. Thus, the negative finding of the lack of fetal calvarium, as well as the positive finding of insufficient space for a calvarium to exist between the fetal thorax and the uterine wall, can be confidently ascertained. One can then be certain that a fetal head is not being missed by the ultrasound beam, as is possible with a rapidly moving fetus using B-mode ultrasound.
无脑儿可通过实时超声检查进行诊断。这能够观察到胎儿的活动，并有助于识别胎儿各部位，确定胎儿的确切方位。因此，可以确定地查明缺乏胎儿颅骨这一阴性发现，以及胎儿胸部与子宫壁之间不存在颅骨生长所需足够空间这一阳性发现。这样就能确定超声束不会遗漏胎儿头部，而这在使用B超检查快速移动的胎儿时是有可能发生的。
