The flow structure in an anatomically realistic cerebral aneurysm model with small aspect ratio

Taku Morino, Hikoichiro Takahashi, Takatsugu Yamauchi, Kazuo Tanishita, Yuichi Murayama, Satoshi Tateshima, Fernando Vinuela

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

We measured the velocity profiles in an anatomically realistic model of a basilar tip aneurysm with small aspect ratio (depth / neck width) by LDV. We built an aneurysm model based on CT images. The maximum Reynolds number based on the diameter of basilar artery was 795 and the frequency parameter was 5.0. The inflow went into the aneurysm dome along the posterior wall. At the bleb, the flow separated from the wall and was decelerated. The outflow region was widely extended at the anterior side of the aneurysm with low velocity, because the dome shape developed asymmetrically to the anterior side. The shear stress at the bleb was intensified at the beginning of the deceleration phase, although the wall shear stress at intra-aneurysm points didn't change drastically. We found out that aneurysms with small aspect ratio contains the peaked hemodynamic stress by using the realistic model. Therefore the diagnosis of aneurysm should be assessed by a realistic model.

Original languageEnglish
Title of host publicationAmerican Society of Mechanical Engineers, Bioengineering Division (Publication) BED
Pages273-274
Number of pages2
Volume48
Publication statusPublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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    Morino, T., Takahashi, H., Yamauchi, T., Tanishita, K., Murayama, Y., Tateshima, S., & Vinuela, F. (2000). The flow structure in an anatomically realistic cerebral aneurysm model with small aspect ratio. In American Society of Mechanical Engineers, Bioengineering Division (Publication) BED (Vol. 48, pp. 273-274)