Three dimensional Nevoscope image reconstructions using diverging ray ART

Nevoscope is a transillumination imaging device which was designed to obtain an estimate of the 3D shape and volume of an embedded skin lesion using light in the visible spectrum. Light which is introduced into the skin surrounding the lesion, undergoes multiple scattering and re-emerges as back-scattered radiation through the lesion and surrounding skin. Since this light illuminates the lesion from within the skin structure, the images of the lesion as viewed at various angles are two dimensional optical projections of the skin lesion. Tomographic reconstruction techniques are used to reconstruct these lesions. Previous work assumed parallel ray geometry and used ART for reconstruction. In this paper we present an improved reconstruction technique based on the image formation principle at the surface of plane mirrors which are positioned inclined from the vertical on the Nevoscope. Phantoms are created to validate the volumes of the reconstructed lesions. A qualitative comparison of the volumes depict a better representation of the volumes using the new improved algorithm.