A flexible blood flow phantom capable of independently producing constant and pulsatile flow with a predictable spatial flow profile for ultrasound flow measurement validations

1992 ◽  
Vol 39 (11) ◽  
pp. 1111-1122 ◽  
Author(s):  
I.A. Hein ◽  
W.D. O'Brien
Keyword(s):  
Blood Flow ◽  
Pulsatile Flow ◽  
Flow Measurement ◽  
Flow Profile ◽  
Flow Phantom

scholarly journals A realistic flow phantom model of the carotid artery in preterm infants for training and research

Ultrasound ◽  
2020 ◽  
Vol 28 (3) ◽  
pp. 145-154
Author(s):  
Sujith Pereira ◽  
Jonathan Reeves ◽  
Malcolm Birch ◽  
Sakthi Finton-James ◽  
Komal Verma ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Carotid Artery ◽  
Preterm Infants ◽  
Pulsatile Flow ◽  
Vessel Diameter ◽  
Flow Measurements ◽  
Phantom Model ◽  
Flow Phantom ◽  
Volume Measurements

Introduction Cerebral blood flow is increasingly monitored in preterm infants. Doppler ultrasound of the carotid artery is a widely available method but is operator dependent. Our aim was to design and produce a realistic flow phantom model of the carotid artery of preterm infants. Methods Data from cerebral blood flow measurements using Doppler ultrasound of the right common carotid artery from 21 premature newborn infants were used to produce a Doppler flow phantom model with three different vessel diameters. Vessel diameter, continuous and pulsatile flow volume measurements were performed by two blinded observers (with more than eight and 20 years of experience). Results Vessel diameter measurements using the phantom were underestimated by 7%. Continuous flow volume measurements were overestimated by 7% by both observers (observer 1 mean difference 1.5 ± 1.96 SD −3.3 to 6.3 ml/min versus observer 2, 1.9 ± 1.96 SD −3.6 to 7.4 ml/min). Pulsatile flow measurements were overestimated by 12.6% by observer 1 (2.7 ± 1.96 SD −0.6 to 5.9 ml/min) and by 7.8% by observer 2 (1.7 ± 1.96 SD −1.6 to 4.9 ml/min). There was good interobserver and intraobserver reliability for the majority of measurements using continuous and pulsatile flow. Conclusion It is feasible to produce a realistic flow phantom model of the neonatal carotid artery of preterm infants. Diameter measurements were underestimated and flow measurements were overestimated. These errors fell within acceptable limits for in vivo measurements. If these limitations were related to materials, this could be explored using a wall-less model. The flow phantom could be utilised for research and training clinicians in measuring cerebral blood flow using the carotid artery in this vulnerable group of infants.

MEASUREMENT OF BLOOD FLOW WITH FREELY DIFFUSIBLE INDICATORS AS INERT GASES, ANTIPYRINE, LABELLED WATER AND RUBIDIUM

1972 ◽  
Vol 68 (2_Supplb) ◽  
pp. S95-S111 ◽  
Author(s):  
Niels A. Lassen ◽  
Ole Andrée Larsen
Keyword(s):  
Blood Flow ◽  
Flow Measurement ◽  
Capillary Wall ◽  
Inert Gases ◽  
Tissue Blood Flow ◽  
Blood Flow Measurement

ABSTRACT Indicators which freely cross the capillary wall can be used for measurement of tissue blood flow in many different ways. Basically one can distinguish two categories of methods, viz. the ones where the indicator enters the tissue via the inflowing blood and the ones where the indicator is deposited locally in the tissue. The most important methods are briefly described with special emphasis on the theory of blood flow measurement.

Regional blood flow measurement in vivo for a definable geometry

1964 ◽  
Vol 206 (5) ◽  
pp. 962-966 ◽  
Author(s):  
Marvin B. Bacaner ◽  
James S. Beck
Keyword(s):  
Blood Flow ◽  
Flow Measurement ◽  
Necessary Conditions ◽  
Regional Blood Flow ◽  
The Body ◽  
Continuous Measure ◽  
Radioisotope Method ◽  
Arterial Concentration ◽  
Regional Concentration

A radioisotope method for measuring regional blood flow in the intestine of the dog in vivo has been favorably compared with measurement by timed collection of total venous outflow. The necessary conditions are a continuous measure of arterial concentration and cumulative regional concentration of radioisotope, an experimentally definable region, and temporary complete retention of tracer. The derivation of the relations used suggests additional applications of the method to other regions of the body.

Reproducibility of myocardial blood flow measurement with PET

1995 ◽  
Vol 2 (2) ◽  
pp. S14-S14
Author(s):  
R GISTRI ◽  
R LORENZONI ◽  
F CECCHI ◽  
G CHIRIATTI ◽  
P SALVADORI ◽  
...  
Keyword(s):  
Blood Flow ◽  
Myocardial Blood Flow ◽  
Flow Measurement ◽  
Blood Flow Measurement ◽  
Myocardial Blood Flow Measurement

scholarly journals Renal arterial blood flow measurement by breath-held MRI: Accuracy in phantom scans and reproducibility in healthy subjects

2010 ◽  
Vol 63 (4) ◽  
pp. 940-950 ◽  
Author(s):  
Samuel Dambreville ◽  
Arlene B. Chapman ◽  
Vicente E. Torres ◽  
Bernard F. King ◽  
Ashley K. Wallin ◽  
...  
Keyword(s):  
Blood Flow ◽  
Healthy Subjects ◽  
Flow Measurement ◽  
Arterial Blood Flow ◽  
Blood Flow Measurement ◽  
Arterial Blood

Pulpal Blood Flow Measurement with Ultrasound Doppler Imaging

2010 ◽  
Vol 36 (3) ◽  
pp. 419-422 ◽  
Author(s):  
Min-Jung Yoon ◽  
Euiseong Kim ◽  
Seoung-Jong Lee ◽  
Young-Min Bae ◽  
Sergey Kim ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Measurement ◽  
Doppler Imaging ◽  
Blood Flow Measurement ◽  
Ultrasound Doppler ◽  
Pulpal Blood Flow

The Challenges of Wide Ranging Viscosity Fluids on Liquid Ultrasonic Flowmeters

2006 ◽  
Author(s):  
Jeffrey L. Walters
Keyword(s):  
Elevated Temperature ◽  
Temperature Effects ◽  
Flow Measurement ◽  
Field Testing ◽  
Signal Propagation ◽  
Oil Fields ◽  
Flow Profile ◽  
Fluid Temperature ◽  
Testing Data ◽  
Novel Approaches

Wide ranging viscosities in ultrasonic flow measurement for liquids is a common pipeline scenario. With ever maturing oil fields and the growth in oilsands production, the trend appears to be towards the higher end viscosities and/or novel approaches towards reducing the viscosities for transportation such as heating. The variable viscosities of the fluids provide some unique challenges to ultrasonic flowmeters not only in terms of flow profile modeling, but also in acoustic signal propagation and application to elevated temperature fluids which likewise affect the accuracy or performance of the measurement. The flow profile interrogation techniques will be discussed with an emphasis on a distributed chord model together with the use of a waveguide technology that minimizes acoustic and fluid temperature effects. A combination of R&D, calibration and field testing data will both demonstrate these challenges as well as show the increased performance that results from the application of these approaches.

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