This lecture covers the reconstruction of images from projections in computer tomography, including the basics of the Radon transform, sinogram, backprojection, inverse Radon transform, and filtered backprojection. It also explores absorption laws, measurement principles, and various techniques and applications in tomography. The history of pioneers in the field, such as Godfrey N. Hounsfield and Alan M. Cormack, is discussed. The lecture delves into the principles of computer tomography, the Radon transform, and sampling considerations. It also explains the Radon transform, its mathematical representation, and the process of reconstructing images from projections.