Doppler blood flow spectral estimation is a technique for non-invasive cardiovascular disease detection. Blood flow velocity and disturbance may be determined by measuring the spectral mean frequency and bandwidth respectively. Typical methods for spectral estimation utilize Fourier Transform-based algorithms to estimate the spectral response of a signal. This current practice suffers from poor...

OBJECTIVE To develop and validate a high temporal resolution spectral analysis system for Doppler measurements of blood velocity in the ascending aorta. DESIGN An observational laboratory and clinical study comparing Doppler velocity-based measurements with fluid collection, electromagnetic flow catheters and probes, and thermodilution. SETTING Tertiary referral cardiology unit and cardiac ...

A method involving intensity correlation measurements is described, which allows for the complete removal of Doppler broadening in emission electromagnetic radiation from faraway sources that are inaccessible to conventional Doppler-free measurements. The technique, relying on a correction ${g}^{(2)}$ order ${N}^{\ensuremath{-}1}$, probes separation between neighboring spectral lines and also a...

Renal arteriovenous fistula (AVF) is an uncommon clinical entity, which can be congenital, acquired, or idiopathic. Diagnosis is aided by radiological studies, with digital subtraction angiography as a gold standard. However, Doppler ultrasound with color Doppler interrogation and computed tomography (CT) angiography are alternative imaging techniques that are noninvasive and can be used for pa...

Ultrasound is used increasingly for diagnosing large vessel vasculitis (LVV). The application of Doppler in LVV is very different from in arthritic conditions. This paper aims to explain the most important Doppler parameters, including spectral Doppler, and how the settings differ from those used in arthritic conditions and provide recommendations for optimal adjustments. This is addressed thro...

Underwater acoustic channel makes high data rate transmission a very challenging task, due to the extended multipaths delay spread and large Doppler spread [1]-[2]. To increase the data rate or spectral efficiency of underwater acoustic communication, people resort to the spatial structure of the oceans by employing multiple-input, multipleoutput (MIMO) technology. With MIMO technology, very hi...

Spectroscopic measurements were performed on the re-installed COMPASS tokamak during the first experiments. The impurity survey spectrometer HR 2000+ was used for registration of the most intense spectral lines in the 457–663nm visible range integrated over the discharge duration. The temporal evolution of integral visible light, Hα and hard X-rays intensities are measured by a photomultipliers...

BACKGROUND Infantile hepatic hemangioendothelioma (IHH) and hepatoblastoma (HBL) are respectively the most common benign and malignant liver tumors in children. OBJECTIVES To study the clinical manifestations and the ultrasound features of the pediatric patients for distinguishing IHH from HBL. PATIENTS AND METHODS Between 2002 and 2012, thirteen children with IHH and 38 children with HBL u...