稳恒流下腹主动脉旁瘤超声多普勒血流信号的仿真分析

腹主动脉旁瘤超声多普勒血流信号的仿真研究，可以为采用超声多普勒技术检测腹主动脉旁瘤的形成、生长过程和估计动脉旁瘤瘤体大小提供指导。先通过有限元数值计算方法得到稳恒流下腹主动脉旁瘤区域内的血液流场分布，然后采用余弦叠加的合成方法仿真出相应的超声多普勒血流信号，最后对仿真信号进行频谱分析，计算其平均频率，并研究它与腹主动脉旁瘤瘤体大小的关系。结果表明：当动脉旁瘤较小时，平均频率的幅度变化较小；当动脉旁瘤较大时，平均频率的幅度变化较大。因此，采用平均频率的幅度变化可以在一定程度上估计动脉旁瘤的瘤体大小。

Simulation Studies of Doppler Ultrasound Blood Flow Signals from Abdominal Aortic Sidewall Aneurysm in a Steady Flow

Simulation studies of Doppler ultrasound blood flow signals from abdominal aortic sidewall aneu- rysm can provide a useful guidance for detecting the formation and growth progress of the abdominal aortic sidewall aneurysm using the Doppler ultrasound technology and forecasting the size of aortic sidewall aneurysm.Firstly the blood flow velocity distribution in the area of abdominal aortic sidewall aneurysm is calculated using the finite ele- ment method.Then relevant Doppler ultrasound blood flow signals ar...