Dependence of power Doppler image on a high pass filter instrumented in ultrasound machine

Evaluation of the effect of machine settings on quantitative three‐dimensional power Doppler angiography: an in‐vitro flow phantom experiment

“…However, in contrast to our findings, Doppler gain and power had limited influence. Mizushige et al 12 showed that the intensity of the power Doppler image was dependent on flow velocity and the wall motion filter under steady flow conditions within a single acrylic tube phantom. They used a saline solution containing 40% glycerol and cornstarch as the BMF, finding a high degree of correlation between the Doppler shift frequency, as measured by conventional pulsed wave Doppler, and the power Doppler image intensity at the center of the flow image.…”

Evaluation of Bowel Ischemia with Contrast-enhanced US: Initial Experience

“…In contrast, transabdominal ultrasonography (US) is regarded as a noninvasive method for the diagnosis of gastrointestinal diseases. However, conventional Doppler US is not necessarily suitable for the evaluation of gastrointestinal microperfusion because the flow velocity and signal power are often under the rejection level of the high-pass filter (2). Within the past few years, it has become possible to evaluate transmural bowel wall perfusion at scanning after the injection of SHU-508A (3,4).…”

Assessment of mitral regurgitation by the measurement of vena contracta using power doppler echocardiography

“…Therefore, a possible mechanism may be proposed that the ''power'' is prominently high in the lesion of vena contracta. Additionally, we have reported that the signal intensity of power Doppler is not completely independent of the flow velocity [27]. Since the flow velocity at the vena contracta is the highest in the regurgitant flow areas, the high velocity itself at the vena contracta may improve resolution by power Doppler echocardiography.…”