Pulsatile Flow Fields in a Model of Abdominal Aorta With Its Peripheral Branches

Lee, Denz; Chen, J. Y.

doi:10.4015/s1016237203000262

Cited by 13 publications

(6 citation statements)

References 21 publications

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“…The suprarenal flow profile used in this study was based on Lee et al where the flow rate Q in L/min was represented by a trigonometric formula as shown in Equation ().

Q = C_{1} + C_{2} cos (2 π t / T) + C_{3} cos (4 π t / T) + C_{4} sin (2 π t / T) + C_{5} sin (4 π t / T)

…”

Section: Methodsmentioning

confidence: 99%

A novel roller pump for physiological flow

et al. 2020

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“…The suprarenal flow profile used in this study was based on Lee et al where the flow rate Q in L/min was represented by a trigonometric formula as shown in Equation ().

Q = C_{1} + C_{2} cos (2 π t / T) + C_{3} cos (4 π t / T) + C_{4} sin (2 π t / T) + C_{5} sin (4 π t / T)

…”

Section: Methodsmentioning

confidence: 99%

A novel roller pump for physiological flow

et al. 2020

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“…To simulate the blood flow in the mean cerebral artery (MCA) a pulsatile flow pattern was created with characteristics similar to that of blood in the MCA. 10,11 Data were acquired using a MulitDop X4 probe and system (MultiDop X4, DWL Electronic Systems, Sippelingen, Germany), linked to a BioPac MP150 system (Biopac Systems, Inc., Goleta, USA). In steps of 10 degrees the perspex tube holder was rotated around its axis (using a protractor).…”

Section: In-vitro Experimentsmentioning

confidence: 99%

The effects of probe placement on measured flow velocity in transcranial Doppler ultrasound imaging in-vitro and in-vivo experiments

et al. 2014

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The measurement of the blood flow in the middle cerebral artery (MCA) using transcranial Doppler ultrasound (US) imaging is clinically relevant for the study of cerebral autoregulation. Especially in the aging population, impairement of the autoregulation may coincide or relate to loss of perfusion and consequently loss of brain function. The cerebral autoregulation can be assessed by relating the blood pressure to the blood flow in the brain. Doppler US is a widely used, non-invasive method to measure the blood flow in the MCA. However, Doppler flow imaging is known to produce results that are dependent of the operator. The angle of the probe insonation with respect to the centerline of the blood vessel is a well known factor for output variability. In patients also the skull must be traversed and the MCA must be detected, influencing the US signal intensity. In this contribution we report two studies. We describe first an in-vitro setup to study the Doppler flow in a situation where the ground truth is known. Secondly, we report on a study with healthy volunteers where the effects of small probe displacements on the flow velocity signals are investigated. For the latter purpose, a special probe holder was designed to control the experiment.

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“…Velocity gradients determine the region, area and length of flow recirculation in the system [26]. Wall pressure (pressure exerted on the arterial wall) validates the velocity and is used to correlate to arterial wall thickening [27]. WSS is an important parameter which can help predict the extent of stenosis in a particular region [28].…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis on Effect of Angulation in A Healthy Abdominal Aorta-Renal Artery Junction

Hegde

Shenoy

Khader

et al. 2021

ARFMTS

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The recent developments in computational fluid dynamics (CFD) can be useful in observing the detailed haemodynamics in renal artery bifurcation for clinical evaluation and treatment. The present study focuses on haemodynamic behaviour of blood as it flows through the abdominal aorta-renal artery junction in an idealistic healthy artery with varying bifurcation angles to the abdominal aorta, i.e. from 30° to 90° with increments of 15°. This is to examine the effect of angulation on the junction and to determine whether arterial geometry plays a role in the prediction of atherosclerotic lesions. The three-dimensional models used in this study were generated using ANSYS WORKBENCH 19.0, and numerical simulation was done using FLUENT 19.0 solver. The blood flow is assumed to be Newtonian, incompressible and laminar. Haemodynamic parameters such as velocity, wall pressure and wall shear stress along with flow variation are compared among the different models. As the angulation increased, velocity and wall shear stress at the ostial region decreased by 14% and 52% respectively. Wall pressure at the same region saw an increase by 3%. Therefore, renal arteries with higher bifurcating angles to the abdominal aorta were observed to be more prone to the formation of atherosclerotic lesions. The present study is a precursor for future studies on renal artery with stenosis.

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Pulsatile Flow Fields in a Model of Abdominal Aorta With Its Peripheral Branches

Abstract: ABSTRACT

Cited by 13 publications

References 21 publications

A novel roller pump for physiological flow

A novel roller pump for physiological flow

The effects of probe placement on measured flow velocity in transcranial Doppler ultrasound imaging in-vitro and in-vivo experiments

CFD Analysis on Effect of Angulation in A Healthy Abdominal Aorta-Renal Artery Junction

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