Widder B
Neurologische Universitätsklinik Ulm.
Ultraschall Med. 1993 Oct;14(5):231-9. doi: 10.1055/s-2007-1005253.
Reliable colour-coded ultrasound duplex investigations of the vascular system require sufficient knowledge of its technical features. The most important parameters are the emitted ultrasound frequency, the axial and lateral resolution, the relationship between the colour-coded and B-mode gain, the Doppler insonation angle of the vessels, the upper (aliasing threshold) and lower (wall filter) cut-off frequencies, the frame rate as well as the influence of digital image processing. The practical relevance of these features for assessing the velocity, direction, pulsatility, localisation and disturbance of flow in blood vessels is discussed in comparison to conventional Doppler and duplex techniques.
对血管系统进行可靠的彩色编码超声双功检查需要充分了解其技术特性。最重要的参数包括发射的超声频率、轴向和侧向分辨率、彩色编码与B模式增益之间的关系、血管的多普勒入射角度、上限（混叠阈值）和下限（壁滤波器）截止频率、帧率以及数字图像处理的影响。与传统多普勒和双功技术相比，讨论了这些特性在评估血管内血流速度、方向、搏动性、定位和血流紊乱方面的实际相关性。
