Phillips D J, Hossack J, Beach K W, Strandness D E
Department of Surgery, School of Medicine, University of Washington, Seattle 98195.
J Ultrasound Med. 1990 Aug;9(8):429-36. doi: 10.7863/jum.1990.9.8.429.
The spatial, temporal, and frequency resolution of conventional ultrasonic Doppler instruments and the time/space distortions in two-dimensional color Doppler imaging systems can be measured using a pulsatile moving string target. The diameter of the string is small compared with the Doppler sample volume, the velocity (speed and direction), acceleration and timing of the string motions are precisely known with reference to the R wave timing mark, and the spatial location of the string is known. A loop of surgical thread or monofilament fishline running between pulleys is driven by a motor that provides constant string speeds from 0.05 to 150 cm/s and variable string speeds programmed to mimic arterial velocity waveforms from the carotid, aortic, and femoral arteries. Constant string speeds are used to evaluate the Doppler sensitivity, frequency processing, and sample volume size; pulsatile movement of the string provides a physiologic model to evaluate the temporal performance of conventional Doppler systems and the temporal and spatial performance of two-dimensional color Doppler imaging scanners.
使用脉动移动弦线目标可以测量传统超声多普勒仪器的空间、时间和频率分辨率以及二维彩色多普勒成像系统中的时间/空间失真。与多普勒采样体积相比，弦线的直径较小，弦线运动的速度（速度和方向）、加速度和时间相对于R波定时标记是精确已知的，并且弦线的空间位置是已知的。在滑轮之间运行的手术线或单丝鱼线环由电机驱动，该电机提供从0.05到150 cm/s的恒定弦线速度以及编程为模拟来自颈动脉、主动脉和股动脉的动脉速度波形的可变弦线速度。恒定弦线速度用于评估多普勒灵敏度、频率处理和采样体积大小；弦线的脉动运动提供了一个生理模型，以评估传统多普勒系统的时间性能以及二维彩色多普勒成像扫描仪的时间和空间性能。
