Image Aberrations Produced by Multichannel Collimators for a Scintillation Camera

Abstract

An interference pattern which distorted the representation of a parallel-line phantom containing a radionuclide was observed during a study of the quality of the image produced by a commercial Anger camera equipped with “diverging” and other multichannel collimators. Discontinuities occurred in the individual phantom line images, forming a Moiré pattern. The effect was maximal close to the face of the collimator and disappeared at a distance from it. Further study has shown this to be a property of all camera collimators with thick septa between the linear arrays of collimator holes.