Dr. Ashkan Ghanbarzadeh-Dagheyan Profile

Dr. Ashkan Ghanbarzadeh-Dagheyan

at Univ Twente

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Publications (3)

SPIE Journal Paper | 16 May 2024 Open Access

Validation of ultrasound velocimetry and computational fluid dynamics for flow assessment in femoral artery stenotic disease

Lennart van de Velde, Majorie van Helvert, Stefan Engelhard, Ashkan Ghanbarzadeh-Dagheyan, Hadi Mirgolbabaee, Jason Voorneveld, Guillaume Lajoinie, Michel Versluis, Michel M. P. J. Reijnen, Erik Groot Jebbink

JMI, Vol. 11, Issue 03, 037001, (May 2024) https://doi.org/10.1117/12.10.1117/1.JMI.11.3.037001

KEYWORDS: Ultrasonography, Velocimetry, Arteries, Computational fluid dynamics, Boundary conditions, Hemodynamics, Video, Turbulence, Particle image velocimetry, Doppler effect

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PurposeTo investigate the accuracy of high-framerate echo particle image velocimetry (ePIV) and computational fluid dynamics (CFD) for determining velocity vectors in femoral bifurcation models through comparison with optical particle image velocimetry (oPIV).ApproachSeparate femoral bifurcation models were built for oPIV and ePIV measurements of a non-stenosed (control) and a 75%-area stenosed common femoral artery. A flow loop was used to create triphasic pulsatile flow. In-plane velocity vectors were measured with oPIV and ePIV. Flow was simulated with CFD using boundary conditions from ePIV and additional duplex-ultrasound (DUS) measurements. Mean differences and 95%-limits of agreement (1.96*SD) of the velocity magnitudes in space and time were compared, and the similarity of vector complexity (VC) and time-averaged wall shear stress (TAWSS) was assessed.ResultsSimilar flow features were observed between modalities with velocities up to 110 and 330 cm/s in the control and the stenosed model, respectively. Relative to oPIV, ePIV and CFD-ePIV showed negligible mean differences in velocity (<3 cm/s), with limits of agreement of ±25 cm/s (control) and ±34 cm/s (stenosed). CFD-DUS overestimated velocities with limits of agreements of 13±40 and 16.1±55 cm/s for the control and stenosed model, respectively. VC showed good agreement, whereas TAWSS showed similar trends but with higher values for ePIV, CFD-DUS, and CFD-ePIV compared to oPIV.ConclusionsEPIV and CFD-ePIV can accurately measure complex flow features in the femoral bifurcation and around a stenosis. CFD-DUS showed larger deviations in velocities making it a less robust technique for hemodynamical assessment. The applied ePIV and CFD techniques enable two- and three-dimensional assessment of local hemodynamics with high spatiotemporal resolution and thereby overcome key limitations of current clinical modalities making them an attractive and cost-effective alternative for hemodynamical assessment in clinical practice.

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Proceedings Article | 12 March 2024 Poster + Paper

Photoacoustic imaging of colorectal cancer in ex vivo samples: a preliminary study

Ashkan Ghanbarzadeh-Dagheyan, Kalloor Joseph Francis, Cyrille Mooij, Stefan van der Stel, Mithun Kuniyil Ajith Singh, Theo Ruers

Proceedings Volume 12842, 1284214 (2024) https://doi.org/10.1117/12.3002767

KEYWORDS: Connective tissue, Tumors, Tissues, Biological samples, Colorectal cancer, Photoacoustic imaging, Ultrasonography, Image visualization, Error control coding, Ultrasound tomography, Cancer detection

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Proceedings Article | 10 April 2023 Poster + Paper

Comparing flow in helical and straight stents using 2D ultrasound particle image velocimetry

Ashkan Ghanbarzadeh-Dagheyan, Lennart van de Velde, Michel M. P. Reijnen, Michel Versluis, Erik Groot Jebbink

Proceedings Volume 12470, 1247012 (2023) https://doi.org/10.1117/12.2656978

KEYWORDS: 3D modeling, Cardiovascular disorders, Arteries, Particle image velocimetry, Printing, Sensors, In vitro testing, Ultrasonography

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