Фролов Сергей Владимирович (RU),Синдеев Сергей Вячеславович (RU),Потлов Антон Юрьевич (RU)
申请号：
RU2016112096
公开号：
RU0002636189C2
申请日:
2016.03.30
申请国别(地区):
RU
年份:
2017
代理人:
摘要：
FIELD: medicine.SUBSTANCE: size of the flow-directing stent is determined by the empirical formula: 0.9⋅(prox+dist)/2. The availability of flow-directed stents of the required size is checked by selection of the closest size of the flow-directing stent from the list of standard sizes. Properties of the cerebral artery wall are determined, for which structural images of the cerebral artery aneurysm wall for systole and diastole are obtained by endoscopic optical coherence tomography. Thickness of the cerebral artery aneurysm wall is determined on the basis of structural images obtained by endoscopic optical coherence tomography by multiplying the number of pixels corresponding to the thinnest part of the cerebral aneurysm wall by the axial resolution of the structural image. Youngs modulus is calculated for the cerebral artery aneurysm wall based on the ratio of axial tension of the cerebral artery aneurysm wall to its axial deformation. Axial deformation is determined by pixel-by-pixel analysis of the structural images of the cerebral artery aneurysm wall made for systole and diastole using the cross-correlation function. The axial stress is found as the ratio of the empirically estimated force of the pulse wave acting on the scan area to the pixel-by-pixel estimated cross-sectional area of this region. The Poisson ratio is determined as the ratio of the axial deformation of the cerebral artery aneurysm wall to the axial deformation of the cerebral artery aneurysm wall and these deformations are found from strain-strain curves calculated on the basis of a pixel-by-pixel analysis of a series of at least several tens of structural images of the aneurysm wall that describe the process of pulse wave propagation. Only a pulse wave is used as a source of mechanical influence on the object being studied. Based on pixel-by-pixel analysis of images using cross-correlation function, relative changes in the vessel wall sections thickness are determined. Compression elastograph
