A fast algorithm for computer aided collimation gamma camera (CACAO)

The computer aided collimation gamma camera is aimed at breaking down the r esolution sensitivity trade-off of the conventional parallel hole collimato r. It uses larger and longer holes, having an added linear movement at the acquisition sequence. A dedicated algolithm including shift and sum, deconv olution. parabolic filtering and rotation is described. Examples of reconst ruction are given. This work shows that a simple and fast algorithm, based on a diagonal dominant approximation of the problem carl be derived. Its gi ves a practical solution to the CACAO reconstruction problem.