they turned out to be lung overinflation and subcutaneous emphysema on computed tomography. In severe cases of lung overinflation, there is a minimal expansion of lung on inspiration leading to minimal lung sliding seen on US. It can be mistaken as a lack of lung sliding. Moreover, in subcutaneous emphysema, pockets of air in subcutaneous tissues make identification of pleural line difficult, l...

In this contribution, the Doppler spectral properties are simulated and analyzed based on 3GPP Spatial Channel Model extension (SCME). SCME standard channel model is applied to the system evaluation and optimization in LTE and other future communication networks. Since future mobile communication systems demand for high moving speed, the simulation and analysis of Doppler characteristics become...

OBJECTIVE To compare the clinical utility of contrast-enhanced color Doppler US in the differentiation of retinal detachment (RD) from vitreous membrane (VM) with that of various conventional US modalities, and to analyze the enhancement patterns in cases showing an enhancement effect. MATERIALS AND METHODS In 32 eyes examined over a recent two-year period, RD (n=14) and VM (n=18) were confir...

BACKGROUND AND PURPOSE Optimal estimation of cerebral blood-flow volume (BFV) may be an important indicator for better evaluation of the patients with cerebrovascular disorders. In this study, we compared the BFV values at bilateral internal carotid and vertebral arteries of healthy volunteers obtained with color Doppler, power Doppler, and B-flow ultrasound (US) studies and tried to determine ...

For data detection in orthogonal frequency division multiplexing (OFDM) systems over mobile wireless channels, the inter-carrier interference (ICI) term arising from Doppler spread is correlated with the desired carrier term. In this paper, we carry out detailed analysis on the power correlation between the ICI and the desired signal term. Explicit closed-form expression for the covariance func...

Objective: To assess the value of adding three-dimensional (3D) power Doppler (as a diagnostic technique) to grayscale in the prenatal diagnosis of placenta accreta. Material and Methods: One hundred pregnant women with persistent placenta previatotalis (after 28 weeks' gestation) were prospectively enrolled into this study. Gray-scale transabdominal ultrasound was performed to detect loss of t...

BACKGROUND Practically, all complications of kidney biopsy are connected with hemorrhage. In the last years, the use of color Doppler sonography in monitoring kidney biopsies was being described, later the possibility of using power Doppler (PD) in performing kidney biopsies was presented. PD depicts the amplitude, or power, of Doppler signals rather than the frequency shift. This allows detect...