A method to evaluate relevance of hemodynamic factors to artery bifurcation shapes using computational fluid dynamics and genetic algorithms

There are many hemodynamic factors which have been suggested to relate to artery shape regulation but it has not been certain which factors are more effective. We propose a new method to evaluate the relevance of hemodynamic factors to artery shape. First, after selecting some associated factors sai...

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Autores principales:	Masako HIMENO, Shigeho NODA, Kazuaki FUKASAKU, Ryutaro HIMENO, Shigeru TADANO
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2017
Materias:	carotid artery bifurcation computational fluid dynamics genetic algorithms multi-objective optimization wall shear stress relevance of factors Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/a1bf8ae16e3748b483f78ee5070d3a18
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spelling	oai:doaj.org-article:a1bf8ae16e3748b483f78ee5070d3a182021-11-26T07:03:57ZA method to evaluate relevance of hemodynamic factors to artery bifurcation shapes using computational fluid dynamics and genetic algorithms2187-974510.1299/mej.16-00476https://doaj.org/article/a1bf8ae16e3748b483f78ee5070d3a182017-04-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/3/4_16-00476/_pdf/-char/enhttps://doaj.org/toc/2187-9745There are many hemodynamic factors which have been suggested to relate to artery shape regulation but it has not been certain which factors are more effective. We propose a new method to evaluate the relevance of hemodynamic factors to artery shape. First, after selecting some associated factors said to be related with artery shapes, we performed multi-objective optimization that sets two of their factors as objectives to obtain optimized shapes using computational fluid dynamics and genetic algorithms. Then, we checked how similar the original shape was to the optimized shapes using Objective Difference Index (ODI). After this process was applied to seven typical carotid artery bifurcation shapes (seven actual cases), the relevance of each combination of two factors was evaluated. We selected five factors: a) to minimize maximum time-averaged Wall Shear Stress (WSS), b) to maximize minimum time-averaged WSS, c) to minimize WSS gradient, d) to minimize WSS temporary gradient, and e) to minimize inner surface area. At the first stage, shapes were optimized by using only radius as the variable using a fixed center line. We set six kinds of combinations of factors that have trade-off relationships. As a result, ODI in the cases of a) and e) was the smallest, having a value was about one-twentieth that of ODI for the second smallest combination factors of c) and e). Combination factors of minimizing both maximum WSS and artery radius were evaluated to be the most relevant to artery radius in the six kinds of tested combinations. At the next stage, by setting both the radius and center line as variables, it became clear that this combination was also related to the position of the center line. We confirmed our method effectively evaluates the relevance of factors to artery bifurcation shapes.Masako HIMENOShigeho NODAKazuaki FUKASAKURyutaro HIMENOShigeru TADANOThe Japan Society of Mechanical Engineersarticlecarotid artery bifurcationcomputational fluid dynamicsgenetic algorithmsmulti-objective optimizationwall shear stressrelevance of factorsMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 3, Pp 16-00476-16-00476 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	carotid artery bifurcation computational fluid dynamics genetic algorithms multi-objective optimization wall shear stress relevance of factors Mechanical engineering and machinery TJ1-1570
spellingShingle	carotid artery bifurcation computational fluid dynamics genetic algorithms multi-objective optimization wall shear stress relevance of factors Mechanical engineering and machinery TJ1-1570 Masako HIMENO Shigeho NODA Kazuaki FUKASAKU Ryutaro HIMENO Shigeru TADANO A method to evaluate relevance of hemodynamic factors to artery bifurcation shapes using computational fluid dynamics and genetic algorithms
description	There are many hemodynamic factors which have been suggested to relate to artery shape regulation but it has not been certain which factors are more effective. We propose a new method to evaluate the relevance of hemodynamic factors to artery shape. First, after selecting some associated factors said to be related with artery shapes, we performed multi-objective optimization that sets two of their factors as objectives to obtain optimized shapes using computational fluid dynamics and genetic algorithms. Then, we checked how similar the original shape was to the optimized shapes using Objective Difference Index (ODI). After this process was applied to seven typical carotid artery bifurcation shapes (seven actual cases), the relevance of each combination of two factors was evaluated. We selected five factors: a) to minimize maximum time-averaged Wall Shear Stress (WSS), b) to maximize minimum time-averaged WSS, c) to minimize WSS gradient, d) to minimize WSS temporary gradient, and e) to minimize inner surface area. At the first stage, shapes were optimized by using only radius as the variable using a fixed center line. We set six kinds of combinations of factors that have trade-off relationships. As a result, ODI in the cases of a) and e) was the smallest, having a value was about one-twentieth that of ODI for the second smallest combination factors of c) and e). Combination factors of minimizing both maximum WSS and artery radius were evaluated to be the most relevant to artery radius in the six kinds of tested combinations. At the next stage, by setting both the radius and center line as variables, it became clear that this combination was also related to the position of the center line. We confirmed our method effectively evaluates the relevance of factors to artery bifurcation shapes.
format	article
author	Masako HIMENO Shigeho NODA Kazuaki FUKASAKU Ryutaro HIMENO Shigeru TADANO
author_facet	Masako HIMENO Shigeho NODA Kazuaki FUKASAKU Ryutaro HIMENO Shigeru TADANO
author_sort	Masako HIMENO
title	A method to evaluate relevance of hemodynamic factors to artery bifurcation shapes using computational fluid dynamics and genetic algorithms
title_short	A method to evaluate relevance of hemodynamic factors to artery bifurcation shapes using computational fluid dynamics and genetic algorithms
title_full	A method to evaluate relevance of hemodynamic factors to artery bifurcation shapes using computational fluid dynamics and genetic algorithms
title_fullStr	A method to evaluate relevance of hemodynamic factors to artery bifurcation shapes using computational fluid dynamics and genetic algorithms
title_full_unstemmed	A method to evaluate relevance of hemodynamic factors to artery bifurcation shapes using computational fluid dynamics and genetic algorithms
title_sort	method to evaluate relevance of hemodynamic factors to artery bifurcation shapes using computational fluid dynamics and genetic algorithms
publisher	The Japan Society of Mechanical Engineers
publishDate	2017
url	https://doaj.org/article/a1bf8ae16e3748b483f78ee5070d3a18
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A method to evaluate relevance of hemodynamic factors to artery bifurcation shapes using computational fluid dynamics and genetic algorithms

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