3D imaging : theory, technology and applications by Emerson H Duke; Stephen R Aguirre

By Emerson H Duke; Stephen R Aguirre

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This RPI approach uses a more theoretical method of calculating wall strength, compared to the experimental approach of FEARI, and combining the two approaches may lead to improved predictions. Ultimately, the decision to surgically intervene may include a combination of factors including diameter, asymmetry, RPI and FEARI, along with clinical experience, and may determine the most suitable approach to a particular AAA. FEARI may be clinically useful due to the simplicity of the approach. Rupture occurs when the AAA tissue cannot withstand the locally acting wall stress exerted, and therefore, tissue strength must be considered when assessing AAA rupture potential.

This should be readily identifiable by experienced radiologists and clinicians. The coordinates of the centrepoint, or centroid, of the AAA at this region is again noted. Figure 11 shows the detection of centre points for the particular region of interest, that is, the AAA region of the CT scan. The 2D distance between these two points can then easily be determined by simply subtracting the Y-coordinates of each scan, resulting in a measurement of asymmetry in millimetres (mm). For the example shown in Figure 11, by subtracting the Y-coordinates, the resulting maximum asymmetry is approximately 25 mm.

Convidien, MO, USA]. This CT data was then reconstructed using Mimics. These reconstructions allowed the computation of stress distributions within the geometries using the commercially available finite element solver ABAQUS [Dassault Systemes, SIMULIA, Rhode Island, USA]. The numerical tool of FEA involves dividing the structure into a smaller number of sub-domains, called elements. Each element is then connected via nodes. This series of elements over the surface and throughout the wall of the structure is known as a mesh.

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