Ultrasound imaging has been used for performing single-injection peripheral nerve blocks and continuous catheters. One limitation with current technology is the inability to confirm the location of the needle or catheter tip. We describe a new needle and catheter design that permits distal tip visualization using color flow Doppler. An 18-gauge 100-mm insulated Tuohy needle and a 20-gauge 50-mm...

Very high frame rate ultrasound imaging has recently allowed for the extension of the applications of echography to new fields of study such as the functional imaging of the brain, cardiac electrophysiology, and the quantitative imaging of the intrinsic mechanical properties of tumors, to name a few, noninvasively and in real time. In this study, we present the first implementation of Ultrafast...

background: although color doppler ultrasonography (cdus) is useful in the diagnosis of various diseases of the head and neck, flow signals in oral malignant masses are less studied; hence the present study assesses the usefulness of color doppler ultrasonography in quantifying oral squamous cell carcinoma (oscc) vascularization. in addition, we determine the hemodynamic parameters by spectral ...

OBJECTIVE To determine the association and correlation between morphologic features of breast cancer on gray scale ultrasound, and vascularity patterns and indices on color and spectral Doppler ultrasound. STUDY DESIGN Cross-sectional, analytical study. PLACE AND DURATION OF STUDY Department of Radiology, Dow University of Health Sciences and Civil Hospital, Karachi, from August 2006 to Jun...

A 52-year-old female without comorbidities presented with dull, aching pain in the right upper quadrant associated with nausea, but not fever, jaundice, anorexia, or abdominal distension. Examination showed tachycardia and mild tenderness in the right upper quadrant. Investigations revealed a normal hemogram with preserved liver function, renal function, and normal pancreatic enzyme levels. Abd...

Aim of the study was to evaluate the role of echo color/power Doppler and magnetic resonance imaging in the diagnosis of space occupying parotid lesions, in the attempt to establish criteria for differential diagnosis between benign and malignant types. The study population comprised 49 patients (23 male, 26 female), age range 30-85 years, with a space occupying lesion of the parotid gland. Eac...

Using catheter-mounted two-dimensional array transducers, we have obtained real-time three-dimensional color flow and spectral Doppler ultrasound images in phantoms. We have constructed several transducers operating at 5 MHz with up to 137 channels inside a 12 French catheter lumen. The transducer configuration may be side scanning or beveled with respect to the long axis of the catheter lumen....

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 ...

Color Doppler imaging (CDI) is the premiere modality to analyze blood flow in clinical practice. In the prospect of producing new CDI-based tools, we developed a fast unsupervised denoiser and dealiaser (DeAN) algorithm for color Doppler raw data. The proposed technique uses robust and automated image post-processing techniques that make the DeAN clinically compliant. The DeAN includes three co...

three-dimensional color doppler ultrasonography is a new technique to evaluate the pattern of blood vessels. this study was performed to assess the feasibility of this method in evaluation of kidney vasculature pattern in dogs. in this paper, visualization of the renal, interlobar, arcuate, and interlobular arteries and veins using 3d color doppler ultrasonography in dogs is shown and the techn...