Non-Linear Smoothing Filters And Noise Structure In Computed Tomography (CT) Scanning: A Preliminary Report

A. J. Duerinckx; L. M Zatz; A. Macovski

doi:10.1117/12.938189

15 November 1978 Non-Linear Smoothing Filters And Noise Structure In Computed Tomography (CT) Scanning: A Preliminary Report

A. J. Duerinckx, L. M Zatz, A. Macovski

Author Affiliations +

Proceedings Volume 0152, Recent and Future Developments in Medical Imaging I; (1978) https://doi.org/10.1117/12.938189
Event: 22nd Annual Technical Symposium, 1978, San Diego, United States

Abstract

Preliminary results have been obtained with a non-linear filter system for projection data in computed tomography imaging. The non-linear filter system consists of a sequence of three filters: a non-linear median smoother, a linear smoother and a non-linear correction filter. The non-linear correction filter is a modified Kalman filter. Both patient data and simulated phantom data have been used in evaluating and designing the non-linear filter system. There are six parameters to be adjusted to the type of projection data considered. Additional work is required to optimize the filter system. Our preliminary results show a significant improvement in image resolution for a noise reduction comparable to what is obtained with conventional linear filtering techniques. However, this is at the cost of enhancing the streak artifacts.

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A. J. Duerinckx, L. M Zatz, and A. Macovski "Non-Linear Smoothing Filters And Noise Structure In Computed Tomography (CT) Scanning: A Preliminary Report", Proc. SPIE 0152, Recent and Future Developments in Medical Imaging I, (15 November 1978); https://doi.org/10.1117/12.938189

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