Image filtering in single-photon emission computed tomography: principles and applications

Among the factors contributing to optimal image quality in single-photon em ission computed tomography (SPECT). image filtering is an important, though mostly subjectively applied, image-processing parameter. We have aimed at giving an overview of current available SPECT filtering options. Current SP ECT applications are discussed and practical guidelines to choose optimal f ilter parameters for a given situation are provided. It is shown that Hann and Butterworth filters allow accurate approximations to most filter types. The authors support the use of limited filter types in an attempt to stand ardise image-processing approaches, which may lead to better diagnostic com patibility and interpretation of interdepartmental results. (C) 2001 Elsevi er Science Ltd. All rights reserved.