f Angular coverage compensation in transmission tomography

In seismic tomography, the quality of reconstruction depends on different parameters such as angular coverage, signal-to-noise-ratio, local ray geometry, imposed constraints, etc. For the basic definitions and references on geotomography we send the reader to Nolet (1987) and Carrion (1987). In this study, we pursue the following goals: to give a detailed account on recoverability versus angular coverage, to study image blurring due stochastic characteristics of noise and to show the role of constraints in those cases when angular coverage is incomplete.