| Título: | Three-dimensional analysis of digital subtraction angiograms for stereotactic neurosurgery planning |
| Autores: | Mawko, G. M. |
| Fecha: | 1989 |
| Publicador: | McGill University - MCGILL |
| Fuente: |
 |
| Tipo: | Electronic Thesis or Dissertation |
| Tema: | Biophysics, Medical. |
| Descripción: |
Geometric and tomographic methods of reconstructing three-dimensional cerebral blood vessels from two-dimensional digital subtraction angiograms are studied experimentally. Three-dimensional vessel geometry is reconstructed from center-line coordinates of corresponding vessel branches in both stereo and biplane angiogram pairs. The problem associated with finding corresponding vessel branches in biplane images was shown to be reduced by re-projection of stereoscopically reconstructed vessels. Results indicate that the limiting factor in reconstruction accuracy is the degree of vessel foreshortening in biplane image pairs. An iterative algorithm ('Clean') is adapted to tomographic reconstruction of vessel cross-sections from a small number of views. Star-pattern artifacts in images initially formed by back-projection are removed by iterative deconvolution guided by 'a priori' object knowledge. This procedure is repeated for a set of two-dimensional sections that describe the three-dimensional vascular structure. Results show that there is sufficient detail in reconstructed sections to determine the location of vascular structures. |
| Idioma: | en |
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