Tomographie ultrasonore par traitement d'images radiales : application à l'imagerie médicale

Abstract
This work presents a new technique of image reconstruction by backscattering ultrasound tomography using radial images. It is based on the fact that a B mode echographic image, although incomplete or noisy, always contains more information than an image obtained by a projection technique. The new technique is to reconstruct a slice from radial echographic images of this same slice using classic echographic probes. The new method of "Moyennes Maximisées" (maximized-averages) combines the advantages of the method of "Maxima" and the method of "Moyenne" (average). This method was tested and applied in-vitro for the reconstruction of a slice of a fetus thigh. It offers a better image quality that increases with the number of radial images N, and enables to distinguish between various anatomical parts of the slice.