Lupetin A R, Davis D A, Beckman I, Dash N
Department of Diagnostic Radiology, Allegheny General Hospital, Pittsburgh, PA 15212-4772.
Radiographics. 1995 Jan;15(1):179-91. doi: 10.1148/radiographics.15.1.7899596.
Transcranial Doppler sonography is a noninvasive technique that uses a 2-MHz, pulsed Doppler transducer to measure the velocity of blood flow within the circle of Willis and vertebrobasilar system through regions of temporal calvarial thinning or through the orbits or foramen magnum. By using spectral analysis of the Doppler frequency shifts from insonated red blood cells moving through a preselected arterial sample volume, transcranial Doppler calculates and displays the peak systolic and diastolic velocity, the mean velocity, and the pulsatility index of blood flow within the interrogated vessel. Vessel identification is based on standard criteria, including the cranial window used, transducer position, depth of sample volume, direction of blood flow, relationship to the terminal internal carotid artery, and response to common carotid artery compression. Diagnoses made with transcranial Doppler sonography are based on the detection of increased or decreased blood flow velocity, absence of blood flow, or changes in pulsatility.
经颅多普勒超声检查是一种无创技术，它使用2兆赫的脉冲多普勒换能器，通过颞部颅骨变薄区域、眼眶或枕骨大孔来测量 Willis 环和椎基底动脉系统内的血流速度。通过对经预选定动脉取样容积移动的被声纳探测到的红细胞的多普勒频移进行频谱分析，经颅多普勒计算并显示被询问血管内的收缩期峰值速度、舒张期速度、平均速度和血流搏动指数。血管识别基于标准标准，包括所使用的颅骨窗口、换能器位置、取样容积深度、血流方向、与颈内动脉末端的关系以及对颈总动脉压迫的反应。经颅多普勒超声检查所做出的诊断基于对血流速度增加或减少、血流缺失或搏动性变化的检测。
