Bartels E, Flügel K A
Department of Neurology and Clinical Neurophysiology, Akademisches Lehrkrankenhaus, Städtisches Krankenhaus, München-Bogenhausen, Germany.
J Neuroimaging. 1994 Apr;4(2):77-81. doi: 10.1111/jon19944277.
Transcranial duplex color-flow imaging is a new diagnostic method that allows visual display of blood flow in the basal cerebral arteries. This method allows determination of and correction for the Doppler angle of insonation. Conventional transcranial Doppler sonography has no imaging component and assumes a 0-degree Doppler angle for the calculation of flow velocities. The magnitude of the angle of insonation and the effect on flow velocity estimates have not been clearly defined. In order to evaluate the angle of insonation and the effect of angle correction on velocity readings, 50 patients referred for evaluation of cerebrovascular disease were studied. The mean age was 45 years (range, 24-62 yr). All were examined with conventional transcranial Doppler and transcranial duplex color-flow imaging. Specific vessels of the circle of Willis were identified by location, course, and direction of flow on color-flow images and by depth, direction of flow, and transducer orientation with conventional Doppler sonography. Visually controlled measurements of the Doppler angle of insonation were made by color-flow imaging. The data show that the mean angle of insonation was 33 degrees (+/- 15) in the middle cerebral artery, 35 degrees (+/- 17) in the anterior cerebral artery, 45 degrees (+/- 18) in the posterior cerebral artery, and 15 degrees (+/- 14) in the basilar artery. Angle-corrected peak systolic flow velocities were higher in all vessel segments (middle cerebral = 15%, anterior cerebral = 18%, posterior cerebral = 30%, and basilar = 3%), compared to uncorrected velocity readings by conventional Doppler sonography.(ABSTRACT TRUNCATED AT 250 WORDS)
经颅双功彩色血流成像术是一种新的诊断方法，可直观显示脑基底动脉中的血流情况。该方法能够测定并校正超声探测的多普勒角度。传统经颅多普勒超声检查没有成像组件，在计算血流速度时假定多普勒角度为0度。超声探测角度的大小及其对血流速度估计的影响尚未明确界定。为了评估超声探测角度以及角度校正对速度读数的影响，对50名因脑血管疾病前来评估的患者进行了研究。平均年龄为45岁（范围24 - 62岁）。所有患者均接受了传统经颅多普勒检查和经颅双功彩色血流成像检查。通过彩色血流图像上的位置、走行和血流方向以及传统多普勒超声检查中的深度、血流方向和换能器方向来识别 Willis 环的特定血管。通过彩色血流成像对超声探测的多普勒角度进行视觉控制测量。数据显示，大脑中动脉的平均超声探测角度为33度（±15），大脑前动脉为35度（±17），大脑后动脉为45度（±18），基底动脉为15度（±14）。与传统多普勒超声检查未校正的速度读数相比，角度校正后的收缩期峰值血流速度在所有血管段均更高（大脑中动脉 = 15%，大脑前动脉 = 18%，大脑后动脉 = 30%，基底动脉 = 3%）。（摘要截选至250词）
