Moehring Mark A, Spencer Merrill P
Spencer Technologies, Seattle, WA 98122, USA.
Ultrasound Med Biol. 2002 Jan;28(1):49-57. doi: 10.1016/s0301-5629(01)00486-0.
Difficulties in location of transcranial ultrasound (US) windows and blood flow in cerebral vessels, and unambiguous detection of microemboli, have limited expansion of transcranial Doppler US. We developed a new transcranial Doppler modality, power M-mode Doppler (PMD), for addressing these issues. A 2-MHz digital Doppler (Spencer Technologies TCD100M) having 33 sample gates placed with 2-mm spacing was configured to display Doppler signal power, colored red and blue for directionality, in an M-mode format. The spectrogram from a user-selected depth was displayed simultaneously. This system was then explored on healthy subjects and patients presenting with varying cerebrovascular pathology. PMD facilitated window location and alignment of the US beam to view blood flow from multiple vessels simultaneously, without sound or spectral clues. Microemboli appeared as characteristic sloping high-power tracks in the PMD image. Power M-mode Doppler is a new paradigm facilitating vessel location, diagnosis, monitoring and microembolus detection.
经颅超声（US）窗口定位及脑血管血流方面的困难，以及微栓子检测的不明确性，限制了经颅多普勒超声的应用扩展。我们开发了一种新的经颅多普勒模式，即功率M型多普勒（PMD），以解决这些问题。一台具有33个采样门、间距为2毫米的2兆赫数字多普勒仪（斯宾塞技术公司TCD100M）被配置为以M型格式显示多普勒信号功率，根据方向性分别显示为红色和蓝色。同时显示用户选定深度的频谱图。然后在健康受试者和患有不同脑血管病变的患者身上对该系统进行了研究。PMD有助于窗口定位以及超声束的对准，从而能够同时观察来自多条血管的血流，无需声音或频谱线索。微栓子在PMD图像中表现为特征性的倾斜高功率轨迹。功率M型多普勒是一种有助于血管定位、诊断、监测及微栓子检测的新范例。
