Properties of Ghost in M-array Coded Aperture Emission CT

Abstract

A three dimensional reconstruction method has been proposed for the distribution of radiation emitters by a simple method using a m-array coded aperture and an area sensor.
However, under certain condition of observation, the cross-sectional image reconstructed by the method shows fault image (ghost) which represents the radiation distribution in another distant cross-section.
An experiment and some computer simulations are made for confirming the existence of ghost, and the emergence mechanism of ghost is analyzed based on the property of alternately sampled m-array.