Abdel-Azim M S, Hottinger C F
J Med Syst. 1982 Oct;6(5):459-72. doi: 10.1007/BF00994902.
High-resolution ultrasound imaging of peripheral arteries offers a powerful technique for screening of potential stroke victims. However, the technique becomes inaccurate in cases of low-grade stenosis and the presence of noncalcified plaque. In these cases Doppler flow measurement can be used to augment the imaging system to arrive at a more accurate diagnosis. This paper describes a duplex system that combines high-resolution imaging with Doppler measurements. The various real-time processing and control tasks are implemented in a distributed processing system using three different processors. A high-speed digital signal processor (DSP) performs Fourier transforms on the Doppler-shifted signals and also performs some of the premultiplications required for Doppler parameter computations. A dedicated Doppler CPU receives the spectral coefficients from the DSP and computes several parameters such as gray-scale spectrogram coefficients, frequency centroids, spectral broadening coefficients, and velocity profiles. A third CPU is used to control the imaging system and to perform the housekeeping tasks such as control of the video display and the interface with the control panel.
外周动脉的高分辨率超声成像为筛查潜在的中风患者提供了一种强大的技术。然而，在低度狭窄和存在非钙化斑块的情况下，该技术会变得不准确。在这些情况下，可使用多普勒血流测量来增强成像系统，以得出更准确的诊断。本文描述了一种将高分辨率成像与多普勒测量相结合的双工系统。各种实时处理和控制任务在一个使用三种不同处理器的分布式处理系统中实现。一个高速数字信号处理器（DSP）对多普勒频移信号进行傅里叶变换，并执行多普勒参数计算所需的一些预乘法。一个专用的多普勒CPU从DSP接收频谱系数，并计算几个参数，如灰度频谱图系数、频率质心、频谱展宽系数和速度剖面。第三个CPU用于控制成像系统，并执行诸如控制视频显示和与控制面板接口等内务管理任务。
