Color flow mapping

Ferrara, Katherine W.; DeAngelis, Gia A.

doi:10.1016/s0301-5629(96)00216-5

Cited by 79 publications

(41 citation statements)

References 60 publications

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“…It enables real-time noninvasive observation of the hemodynamics as well as of the blood vessel configuration with the color Doppler imaging technique, which measures time delays, magnitudes, and Doppler shift frequencies of the ultrasonic echoes. 4 Note that the measurable velocity information is limited to the Doppler velocity, which is the component of the velocity vector along the ultrasonic beam originating from an ultrasound probe. Therefore, color Doppler imaging necessitates considerable skill by experienced doctors to accurately evaluate the threedimensional velocity field.…”

Section: Introductionmentioning

confidence: 99%

Numerical Experiment of Transient and Steady Characteristics of Ultrasonic-Measurement-Integrated Simulation in Three-Dimensional Blood Flow Analysis

et al. 2008

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In ultrasonic-measurement-integrated (UMI) simulation of blood flows, feedback signals proportional to the difference of velocity vector optimally estimated from Doppler velocities are applied in the feedback domain to reproduce the flow field. In this paper, we investigated the transient and steady characteristics of UMI simulation by numerical experiment. A steady standard numerical solution of a three-dimensional blood flow in an aneurysmal aorta was first defined with realistic boundary conditions. The UMI simulation was performed assuming that the realistic velocity profiles in the upstream and downstream boundaries were unknown but that the Doppler velocities of the standard solution were available in the aneurysmal domain or the feedback domain by virtual color Doppler imaging. The application of feedback in UMI simulation resulted in a computational result approach to the standard solution. As feedback gain increased, the error decreased faster and the steady error became smaller, implying the traceability to the standard solution improves. The positioning of ultrasound probes influenced the result. The height less than or equal to the aneurysm seemed better choice for UMI simulation using one probe. Increasing the velocity information by using multiple probes enhanced the UMI simulation by achieving ten times faster convergence and more reduction of error.

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Section: Introductionmentioning

confidence: 99%

Numerical Experiment of Transient and Steady Characteristics of Ultrasonic-Measurement-Integrated Simulation in Three-Dimensional Blood Flow Analysis

et al. 2008

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“…Ultrasound imaging is widely employed in clinical diagnosis and in vivo studies since it can noninvasively visualize in vivo morphology and hemodynamics in real time [1]. For an example of the latter case, high-resolution ultrasound imaging, which utilizes high-frequency ultrasound of *40 MHz at a high sampling rate of several tens of kHz, was used to address minute anatomy and the rapid heartbeat of small animals [2].…”

Section: Introductionmentioning

confidence: 99%

Poly(vinyl alcohol) gel ultrasound phantom with durability and visibility of internal flow

2014

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“…Ultrasonic measurement was carried out with a color Doppler imaging technique from inside the esophagus. Note that color Doppler ultrasonography measured the velocity component in the ultrasonic beam direction as well as the blood vessel configuration of descending aorta with a chronic aneurysm (19) . In this study, we used the measured vessel configuration, not the measured Doppler velocity, since the latter did not provide data on the velocity vector or pressure which were necessary to evaluate the accuracy of UMI simulation.…”

Section: Subject and Measurement Methodsmentioning

confidence: 99%

“…Ultrasonic measurement is the most widely available since the equipment used is relatively inexpensive and compact. Color Doppler imaging (19) enables us to display realtime images of the vessel configuration by reconstructing time delays and magnitudes of the echo of the ultrasonic beam. The velocity component in the ultrasonic beam direction (Doppler velocity) can also be obtained by measuring the Doppler shift frequency.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Variation of Feedback Methods in Ultrasonic-Measurement-Integrated Simulation of Blood Flow in the Aneurysmal Aorta

Funamoto

Hayase

Saijo

et al. 2006

JSME Int. J., Ser. C

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The complicated relationships between hemodynamics and aneurysms have been investigated intensively. However, existing methodologies have inherent limitations in providing real blood flow fields. The authors have proposed Ultrasonic-Measurement-Integrated (UMI) simulation, in which the feedback signals lead to convergence of the calculated blood flow structure to the real one even with incorrect boundary/initial conditions. In UMI simulation, determination of the feedback law is substantially important, but detailed particulars remain to be accounted for. In this paper, first, the effects of density of feedback points and feedback domains are systematically investigated. Improvement of computational accuracy in the feedback domain is achieved even in low density of feedback points of 25%, and such improvement persists in the downstream region. Secondly, the most effective combination of feedback gains for momentum and pressure equations is investigated, confirming the validity of the simple condition to use the same value for the velocity and pressure gains.

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Color flow mapping

Cited by 79 publications

References 60 publications

Numerical Experiment of Transient and Steady Characteristics of Ultrasonic-Measurement-Integrated Simulation in Three-Dimensional Blood Flow Analysis

Numerical Experiment of Transient and Steady Characteristics of Ultrasonic-Measurement-Integrated Simulation in Three-Dimensional Blood Flow Analysis

Poly(vinyl alcohol) gel ultrasound phantom with durability and visibility of internal flow

Numerical Study on Variation of Feedback Methods in Ultrasonic-Measurement-Integrated Simulation of Blood Flow in the Aneurysmal Aorta

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