A method of constructing a three-dimensional image according to a central projection method, in which after a view point, tomographic images and a projection plane are set so that the tomographic images are put between the view point and the projection plane, a projection image is obtained by a...http://www.google.com/patents/US5694530?utm_source=gb-gplus-sharePatent US5694530 - Method of constructing three-dimensional image according to central projection method and apparatus for same 
