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논문 기본 정보

자료유형
학술대회자료
저자정보
김국배 이상준 (포항공과대학교)
저널정보
한국유체기계학회 한국유체기계학회 학술대회 논문집 유체기계공업학회 제4회 한국유체공학학술대회 논문집 (제2권)
발행연도
2006.8
수록면
825 - 828 (4page)

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Synchrotron X-ray micro-imaging method has been used to observe various dynamics of internal structures inside organisms, industrial devices, and so on. However, it is not suitable for this imaging system to observe dynamics of flows inside a structure because tracer matters, such as seeding particles, dyes typically used in conventional optical flow visualization methods, cannot be detectable under X-ray light source any more. On the other hand, PIV (particle image velocimetry) method, which has recently been accepted as a reliable quantitative flow visualization technique, can extract instantaneous velocity fields by applying digital image processing technique to pairs of consecutive particle images captured with a small time interval. In this study, we composed a synchrotron X-ray PIV system combining the PIV method into a synchrotron X-ray micro-imaging system. At first, peculiar optical characteristics of blood were investigated by enhancing speckle patterns with a synchrotron X-ray imaging method. This pattern enhancement can be explained by propagation-based phase contrast enhancement via sample-to-scintillator distance and by interference-based enhancement via sample thickness. In addition, we quantitatively visualized real blood flow inside a tube without any contrast media. The measured velocity field data show typical features of blood flow such as the yield stress and are well matched with the Casson’s hemorheologic model. The X-ray PIV method has a strong potential for visualizing blood samples non-invasively to obtain detailed flow information such as flow rate, spatial distributions of velocity, and shear stress.

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UCI(KEPA) : I410-ECN-0101-2010-554-002111724