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Abstract
A system for acquisition of 3-D arterial ultrasound geometries and integration with computationalfluiddynamics (CFD) is described. The 3-D ultrasound is based on freehand B-mode imaging with positional information obtained using an optical tracking system. A processing chain was established, allowing acquisition of cardiac-gated 3-D data and segmentation of arterialgeometries using a manual method and a semi-automated method, 3D meshing and CFD. The use of CFD allowed visualization of flow streamlines, 2-D velocity contours and 3-D wall shear stress. Three-dimensional positional accuracy was 0.17–1.8 mm, precision was 0.06–0.47 mm and volume accuracy was 4.4–15%. Patients with disease and volunteers were scanned, with data collection from one or more of the carotid bifurcation, femoral bifurcation and abdominal aorta. An initial comparison between a manual segmentation method and a semi-automated method suggested some advantages to the semi-automated method, including reduced operator time and the production of smooth surfaces suitable for CFD, but at the expense of over-smoothing in the diseased region. There were considerable difficulties with artefacts and poor image quality, resulting in 3-D geometry data that was unsuitable for CFD. These artefacts were exacerbated in disease, which may mean that future effort, in the integration of 3-D arterialgeometry and CFD for clinical use, may best be served using alternative 3-D imaging modalities such as magnetic resonance imaging and computed tomography.
Original language | English |
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Pages (from-to) | 2069-2083 |
Number of pages | 15 |
Journal | Ultrasound in Medicine and Biology (UMB) |
Volume | 35 |
Issue number | 12 |
DOIs | |
Publication status | Published - Dec 2009 |
Keywords / Materials (for Non-textual outputs)
- 3-D
- artery
- Computational fluid dynamics
- Flow-field
- Optical tracking
- Segmentation
- Ultrasound
- Wall shear stress
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- 1 Finished
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Computational modelling and 3D imaging
McDicken, W., Hoskins, P., Marshall, I., Maxwell, S. & Webb, D.
1/10/01 → 30/06/07
Project: Research