Reconstructing images from projections using the maximum-entropy method. Numerical simulations of low-aspect astrotomography
A. T. Baikova · Astronomy Reports · 2007
The reconstruction of images from a small number of projections using the maximum-entropy method (MEM) with the Shannon entropy is considered. MEM provides higher-quality image reconstruction for sources with extended components than the Högbom CLEAN method, which is also used in low-aspect astrotomography. The quality of image reconstruction for sources with mixed structure containing bright, compact features embedded in a comparatively weak, extended base can be further improved using a difference-mapping method, which requires a generalization of MEM for the reconstruction of sign-variable functions. We draw conclusions based on the results of numerical simulations for a number of model radio sources with various morphologies.