On The Strength Of Streak Artifacts In Filtered Back-projection Reconstructions For Limited Angle Weighted X-Ray Transform

Abstract

In this article, we study the limited angle problem for the weighted X-ray transform. We consider two approximate reconstructions by applying filtered back-projection formulas to the limited data. We prove that each resulted operator can be decomposed into the sum of three Fourier integral operators whose symbols are of types \((\varrho ,\,\delta ) \ne (1,\,0).\) The first operator, being a pseudo-differential operator, is responsible for the reconstruction of visible singularities. The other two are responsible for the generation of the artifacts. The theory of Fourier integral operators then implies, in particular, the continuity of the reconstruction operator and geometry of the artifacts. We then extend the technique developed by the author in [Inverse Problems 31 (2015) 055003] to obtain more refined microlocal estimates for the strength of the artifacts.