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Localisation ocalisation of Anatomical Soft oft Tissue Landmarks andmarks of the Head in CT Images mages

By M. Ovinis, D. Kerr, K. Bouazza-marouf, M. Vloeberghs, Prof M. Vloeberghs and Consultant Neurosurgeon


Abstract—In In this paper, algorithms for the automatic localisation of two anatomical soft tissue landmarks of the head, the medial canthus (inner corner of the eye) and the tragus (a small, pointed, cartilaginous flap of the ear), in CT images are described. These landmarks are to be used as a basis for an automated image-to-patient image registration system we are developing. The landmark andmarks are localised on a surface model extracted from CT images, based on surface curvature and a rule based system that incorporates prior knowledge of the landmark characteristics. The approach was tested on a dataset of near isotropic CT images of 95 patients. The position of the automatically localised landmarks was compared to the position of the manually localised landmarks. The average difference was 1.5 mm and 0.8 mm for the medial canthus and tragus, with a maximum difference of 4.5 mm and 2.6 mm m respectively.The medial canthus and tragus can be automatically localised in i CT images, with performance comparable mparable to manual localisation. M. Ovinis is a PhD scholar in the Department of Mechanical an

Year: 2011
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