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Proceedings Paper

Detectability and image quality metrics based on robust statistics: following non-linear, noise-reduction filters
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Paper Abstract

Non-linear image processing and reconstruction algorithms that reduced noise while preserving edge detail are currently being evaluated in medical imaging research literature. We have implemented a robust statistics analysis of four widely utilized methods. This work demonstrates consistent trends in filter impact by which such non-linear algorithms can be evaluated. We calculate observer model test statistics and propose metrics based on measured non-Gaussian distributions that can serve as image quality measures analogous to SDNR and detectability. The filter algorithms that vary significantly in their approach to noise reduction include median (MD), bilateral (BL), anisotropic diffusion (AD) and total-variance regularization (TV). It is shown that the detectability of objects limited by Poisson noise is not significantly improved after filtration. There is no benefit to the fraction of correct responses in repeated n-alternate forced choice experiments, for n=2-25. Nonetheless, multi-pixel objects with contrast above the detectability threshold appear visually to benefit from non-linear processing algorithms. In such cases, calculations on highly repeated trials show increased separation of the object-level histogram from the background-level distribution. Increased conspicuity is objectively characterized by robust statistical measures of distribution separation.

Paper Details

Date Published: 11 March 2014
PDF: 14 pages
Proc. SPIE 9037, Medical Imaging 2014: Image Perception, Observer Performance, and Technology Assessment, 903711 (11 March 2014); doi: 10.1117/12.2042922
Show Author Affiliations
J. Eric Tkaczyk, GE Global Research Ctr. (United States)
Eri Haneda, GE Global Research Ctr. (United States)
Giovanni Palma, GE Healthcare (France)
Razvan Iordache, GE Healthcare (France)
Remy Klausz, GE Healthcare (France)
Mathieu Garayt, GE Healthcare (France)
Ann-Katherine Carton, GE Healthcare (France)

Published in SPIE Proceedings Vol. 9037:
Medical Imaging 2014: Image Perception, Observer Performance, and Technology Assessment
Claudia R. Mello-Thoms; Matthew A. Kupinski, Editor(s)

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