Synovial vascularization in metacarpophalangeal joints of a patient with rheumatoid arthritis treated with leukocytapheresis (LCAP) was evaluated by Doppler sonography. After the treatment with LCAP, evaluation with American College of Rheumatology core set showed improvement, and the levels of C-reactive protein and serum amyloid A protein decreased. Power Doppler sonography demonstrated a red...

This paper addresses the problem of Doppler frequency estimation in the presence of speckle and receiver noise. An ultimate accuracy bound for Doppler frequency estimation is derived from the Cramer-Rao inequality. It is shown that estimates based on the correlation of the signal power spectra with an arbitrary weighting function are approximately Gaussian distributed. Their variance is derived...

The number of radio systems operating in the 2.4 GHz band is rising as a result of increased usage of wireless technologies. Since such devices interfere with one another, satisfactory co-existence becomes important. Several techniques serve to reduce the interference. Included among these are frequency hopping (FH) and power control. From the simulation results it can be seen that frequency ho...

In this paper, we present a new approach for the identification of scattering objects in the delay and Doppler domain. Until now, the identification was done visually based on the power delay profile and video material recorded in the measurement campaigns. We propose to use automatic methods based on the local scattering function (LSF), which brings the Doppler domain into play. The LSF is a m...

Abstract The performance of Space-Based Radar (SBR) to detect air or ground moving targets is influenced by earth clutter, so an effective algorithm to suppressing clutter can be designed if knowing the power and distribution of earth clutter. In this paper, the clutter model of SBR is deduced. Besides, the earth's rotation effect is taken into account and the modification to Doppler frequency ...

Precise Doppler measurements of the star Procyon (αCMi, HR 2943) have been obtained with the ELODIE fiberfed cross-dispersed echelle spectrograph on the 1.93 m telescope at Observatoire de Haute Provence. Here, we present the analysis of data from 10 days observing run carried out in November 1998. We detect significant excess in the power between 0.5–1.5 mHz in the periodograms of the time ser...

Objective: This study aimed to evaluate the clinical utility of power Doppler ultrasonography (PDUS) in the detection of prostate cancer and determine its predictive ability compared to digital rectal examination, serum PSA levels and gray-scale transrectal ultrasonography, using biopsy as the reference standard. Materials and Methods: This is a prospective cross-sectional study of 100 consecut...

INTRODUCTION We report the first case of the successful detection of postpartum unruptured vaginal pseudoaneurysm using power- and pulsed-Doppler ultrasonography after delivery. CASE DESCRIPTION A 38-year-old primiparous Japanese woman had a vaginal laceration with pulsatile bleeding after delivering by vacuum extraction. Transvaginal ultrasonography of the repaired vaginal wall showed an 18 ...

We present a new Doppler estimation for time division duplex (TDD) systems using power spectral density (PSD) based method. First, a detailed analysis of the effect of TDD frame structure is proposed. Based on the results of analysis, we proposed a method of getting the best detection of Doppler spread by adaptive thresholding and a method of eliminating the partial aliasing of PSD by linear in...

Coherent Doppler lidar measurements are of increasing interest for the wind energy industry. Wind measurements are fundamental inputs for the evaluation of potential energy yield and performance of wind farms. Three-dimensional scanning Doppler lidar may provide a new basis for wind farm site selection, design and optimization. In this paper, the authors discuss Doppler lidar measurements obtai...