23 March 1995 Restoration of nuclear medicine images using a Kalman filtering approach
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The discrepancy between diagnostic importance of nuclear medicine images and their quality and the predominating visual interpretation of the images demand quality improvements. Digital image restoration procedures are known for being capable to solve this problem considering both noise and blurring. In this paper we propose the application of a modified 2D Kalman filter for nuclear medicine images (SPECT). In addition to the special capability of processing instationary signals the Kalman filter offers a possibility for controlling the filtering effect in a convenient way. The Kalman filter is based on a state space approach subdividing the imaging process into image generation and image degradation processes. The tested filter operates adaptively by permanent identification of the image generation model. For adaptation to the human visual system the filtering effect is modified depending on image quality represented by the mean information density and the local image contents represented by a structure information. The appropriate filtering effect is determined by modifying filter parameters with a predefined piecewise linear characteristic curve. The both smoothing and structure enhancing effect of our Kalman filtering approach is demonstrated in numerous tests performed with SPECT phantom images and brain SPECT studies.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas Schmitt, Thomas Schmitt, Heinz-Dieter Gebauer, Heinz-Dieter Gebauer, Richard Freyer, Richard Freyer, Liane Oehme, Liane Oehme, Wolf-Gunter Franke, Wolf-Gunter Franke, } "Restoration of nuclear medicine images using a Kalman filtering approach", Proc. SPIE 2421, Image and Video Processing III, (23 March 1995); doi: 10.1117/12.205494; https://doi.org/10.1117/12.205494

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