Ultrasonic pulsed wave range Doppler sensors provide application in various fields, e.g. intruder alarm systems or autonomous vehicle steering, [1], [2], [3]. The timefrequency methods [4, 5] commonly used in these sensors, however, inhere the problem that, due to the transducer's non constant and direction-dependent transfer functions, the Doppler frequency cannot be determined with high accur...

OBJECTIVE Coronary slow-flow phenomenon (CSFP) is described as protracted passage of angiographic contrast agent to the distal portion of the epicardial coronary arteries in the absence of stenosis. Few studies have addressed the effects of this condition on right ventricular (RV) dysfunction. The present objective was to assess RV function in CSFP via 2-dimensional speckle-tracking echocardiog...

Previous studies have shown that the quantification of volumetric blood flow from a color Doppler image (CDI) is a feasible approach to eliminate technical obstacles in the traditional pulsed wave (PW) Doppler method. This paper introduces an automated method that computes the volumetric blood flow through a conduit while tracking the movement of blood flow. Correct calculation of the blood flo...

The fetal circulation is unique in having the right ventricle perform as a systemic pump delivering oxygen-enriched placental blood to the distal fetal systemic circulation via the ductus arteriosus. Both ventricles then operate at similar systemic pressures. For this reason, the pressure gradient across the interventricular septum is known to be minimal. It has been noted, however, in fetuses ...

Measurement of stroke volume by pulsed Doppler echocardiography has not been validated against a reference method in vivo. We compared Doppler systolic frequency shift integrals with electromagnetic flowmeter stroke volume in seven open-chest dogs. A pulsed Doppler echocardiographic transducer was held on the aortic arch with the sample volume in the ascending aorta. Stroke volume was varied by...

This work describes a Doppler ultrasound system for measuring blood flow. The system is intended to be used for assessing coronary implants and bypass operations. Quantifying the blood flow through these implants/bypasses is an important task to ensure the chirurgical process, thus, reducing both the post-chirurgical and death risks. The system is based on an open architecture that is portable ...

In previous publications, a new echo-ranging Doppler system based on transmission of repetitive coherent frequency-modulated ͑FM͒ sinusoids in two different implementations was presented. One of these implementations, the frequency-modulated–frequency-shift measurement ͑FM–fsm͒ Doppler system is, in this paper, compared with its pulsed-wave counterpart, the pulsed-wave– time-shift measurement ͑PW–ts...

Doppler sonographic criteria for assessing peripheral lymph nodes ! Introduction B-mode criteria provide the foundation for the sonographic identification of peripheral lymph nodes as normal or pathological and for differential diagnosis. “Sonography of Peripheral Lymph Nodes Part 1: Normal Findings and B-Image Criteria” therefore provides a comprehensive description of the sonographic appearan...

Myocardial diastolic dysfunction is the relaxation abnormality of ventricles that limits the diastolic filling and generally precedes diastolic heart failure. Diastolic dysfunction is a common finding in diabetes. Diabetic patients receive hyperbaric oxygen (HBO) therapy for non-healing lower extremity ulcers, and exposure to HBO therapy is known to influence cardiovascular functions. This stud...