Marinoni M, Ginanneschi A, Forleo P, Amaducci L
Department of Neurological and Psychiatric Sciences, University of Florence, Italy.
Ultrasound Med Biol. 1997;23(8):1275-7. doi: 10.1016/s0301-5629(97)00077-x.
Transcranial Doppler (TCD) is a technique that evaluates blood flow velocity in intracranial vessels. It uses a 2-MHz probe and a Doppler signal analyzer. Absence of an acoustic window is a considerable problem for clinical utilization of TCD because cerebrovascular patients are frequently elderly. Previous reports suggest a higher prevalence of inadequate temporal acoustic window (TAW) in aged subjects and in females. A consecutive series of 624 subjects (376 males and 248 females, age range 2-86 y) were evaluated by standard TCD examination, to assess the contemporary absence of any signal corresponding to insonated basal arteries, defined as inadequate acoustic window. The rate of inadequate TAW was 8.2%, that of inadequate occipital acoustic window (OAW) was 9.0%. Prevalence of inadequate TAW was higher in females than in males, and OAW was higher in males than in females. Influence of aging on the presence of inadequate acoustic window is confirmed for temporal, but not for the occipital window. Different anatomical characteristics of the 2 regions could explain the different prevalence of TAW and OAW.
经颅多普勒（TCD）是一种评估颅内血管血流速度的技术。它使用一个2兆赫兹的探头和一个多普勒信号分析仪。由于脑血管疾病患者多为老年人，因此缺乏声学窗口是TCD临床应用中的一个重大问题。先前的报告表明，老年受试者和女性中颞部声学窗口（TAW）不足的发生率较高。通过标准TCD检查对连续的624名受试者（376名男性和248名女性，年龄范围2 - 86岁）进行评估，以评估对应于被探测的基底动脉的任何信号缺失情况，即定义为声学窗口不足。TAW不足率为8.2%，枕部声学窗口（OAW）不足率为9.0%。女性中TAW不足的发生率高于男性，而男性中OAW不足的发生率高于女性。对于颞部而言，衰老对声学窗口不足的影响得到证实，但枕部窗口并非如此。这两个区域不同的解剖特征可以解释TAW和OAW的不同发生率。
