Hamper U M, DeJong M R, Caskey C I, Sheth S
Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins Medical Institutions, Baltimore, MD, USA.
Radiographics. 1997 Mar-Apr;17(2):499-513. doi: 10.1148/radiographics.17.2.9084086.
Power Doppler imaging has recently gained attention as an additional color flow imaging technique that overcomes some of the limitations of conventional color Doppler ultrasound (US). Limitations of conventional color Doppler US include angle dependence, aliasing, and difficulty in separating background noise from true flow in slow-flow states. Owing to its increased sensitivity to flow, power Doppler sonography is valuable in low-flow states and when optimal Doppler angles cannot be obtained. Longer segments of vessels and more individual vessels can be visualized with power Doppler US than with conventional color Doppler sonography. Power Doppler sonography increases diagnostic confidence when verifying or excluding testicular or ovarian torsion and confirming thrombosis or occlusion of vessels. Power Doppler sonography also improves evaluation of parenchymal flow and decreases examination times in technically challenging cases. Power Doppler US is a useful adjunct to mean-frequency color Doppler sonography, especially when color Doppler US cannot adequately obtain or display diagnostic information.
能量多普勒成像作为一种额外的彩色血流成像技术，最近受到了关注，它克服了传统彩色多普勒超声（US）的一些局限性。传统彩色多普勒超声的局限性包括角度依赖性、混叠以及在慢血流状态下难以将背景噪声与真实血流区分开来。由于其对血流的敏感性增加，能量多普勒超声在低血流状态以及无法获得最佳多普勒角度时具有重要价值。与传统彩色多普勒超声相比，能量多普勒超声能够显示更长节段的血管以及更多的单个血管。在验证或排除睾丸或卵巢扭转以及确认血管血栓形成或闭塞时，能量多普勒超声可提高诊断的可信度。能量多普勒超声还能改善对实质血流的评估，并减少技术上具有挑战性的病例的检查时间。能量多普勒超声是平均频率彩色多普勒超声的有用辅助手段，特别是在彩色多普勒超声无法充分获取或显示诊断信息时。
