Directional continuous wave Doppler ultrasonography has been used to assess the extracranial carotid arteries of over 500 patients, 90 of whom have had angiography performed. The angiographic and Doppler findings are compared, showing that this simple ultrasound technique is able to detect carotid stenosis and occlusion, but is unreliable in the detection of mild atheromatous change. In this se...

PURPOSE The effectiveness of real-time feedback using an audible pulse in renal Doppler ultrasonography was evaluated. METHODS This study was approved by the institutional review board of our hospital. Written informed consent was provided by all volunteers at enrollment. The 26 healthy volunteers enrolled in this study underwent Doppler ultrasound of both kidneys using audible and inaudible ...

In current Doppler blood flow studies, the low Doppler shift frequencies of high energy generated by the wall motion are purposely filtered out. Since these low Doppler shift frequencies are produced by the contracting myocardium, they are expected to contain potential information for the assessment of myocardial properties. Early descriptions of directional pulsed Doppler tissue imaging (DTI) ...

The blood flow teas measured continuously in the intact vortex vein of the anesthetized rabbit using an ultrasonic Doppler -flowmeter toith a frequency response of approximately 4 Hz. Blood flow correlated well ivith perfusion pressure (arterial pressure minus intraocular pressure). The intraocidar pressure was changed stepwise by perfusion from a saline reservoir, Tonometry teas performed tuit...

The cerebrovascular Doppler examination (CDE) and oculopneumoplethysmography (OPG-Gee) were compared in a single population group with no statistically significant difference found between the 2 studies. There appeared to be an advantage to combinant testing, for when the results of the 2 studies were concordant there was an accuracy of 94% and a false negative rate of 8%. Clinical correlation ...

Dear editor, we would like to discuss on the article on “Minimal hydrocelectomy with the aid of scrotoscope (1)”. Bin et al. concluded that “the combination of minimal hydrocelectomy and scrotoscopy seems to be an encouraging technique (1)”. This result can support the previous observation that minimally invasive hydrocelectomy is safe and requires a short operative time (2). It is agreeable th...

OBJECTIVE To report the current status of speckle tracking techniques in evaluation of fetal myocardial deformation. METHODS A variety of non-Doppler ultrasound methods are available using offline analysis of standard four-chamber and short axis views of the heart. RESULTS Most reports have used techniques developed for the measurement of strain and strain rate in the adult heart and produc...

This study proposes multiple-site hemodynamic analysis of Doppler ultrasound with an adaptive color relation classifier for arteriovenous access occlusion evaluation in routine examinations. The hemodynamic analysis is used to express the properties of blood flow through a vital access or a tube, using dimensionless numbers. An acoustic measurement is carried out to detect the peak-systolic and...

This article discusses the traditional and more recent echocardiographic measures that have been employed to evaluate atrial function. Conventional parameters commonly used and reported in the literature include the study of the various phases of atrial activity using atrial volume measurements, the peak A wave velocity, its velocity time integral (VTI) and the fraction of atrial contribution (...