Abstract
A new method of processing digital images consists of a numerical filter which suppresses normal features producing an enhancement of the abnormality. The resulting filtered image aids the observer in the recognition of the abnormality. The filter is developed from verified normal images in the computer memory. The enhancement of pathologic accumulations with respect to surrounding activity was improved on the average by a factor of 2.6 for 13 lateral brain images.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Barber, D.C., Mallard, J.R.: Data processing of radioisotope images for optimum smoothing. Phys. in Med. Biol. 16 635–644 (1971)
Brown, D.W., Kirch, D.L., Ryerson, T.W.: Computer processing of scans using Fourier and other transformations. J. nucl. Med. 12, 287–291 (1971)
Delashmit, W.H., Webber, R.F.: Gray level enhancement techniques for increasing the observability of the borders of features of digitized imagery. Photogr. Sci. Eng. 17, 518–523 (1973)
Gramenopoulos, N.: Optimization of information display in image recorders. Photogr. Sci. Eng. 18, 658–663 (1974)
Herath, K.B., Sharp, P.F.: Effects of “matched filter” smoothing as measured by receiver operating characteristic curve. Phys. in Med. Biol. 21, 442–446 (1976)
Kohonen, T.: An adaptive associative memory principle. IEEE Trans. Comp. 23, 444–445 (1974)
Kohonen, T.: Associative Memory; A System-Theoretical Approach. Springer-Verlag Series: Communication and Cybernitics 16, (in press)
Kohonen, T., Oja, E.: Fast adaptive formation of orthogonalizing filters and associative memory in recurrent networks of neuronlike elements. Biol. Cybern. 21, 85–95 (1976)
Kohonen, T., Oja, E., Ruohonen, M.: Adaption of a linear system to finite set of patterns occuring in an arbitrarily varying order. Acta polytech. scand. 25, 7–15 (1974)
Kuhl, D.E.: The author's reply. J. nucl. Med. 14, 876 (1973)
Kuhl, D.E., Sanders, T.D., Edwards, R.Q.: Failure to improve observer performance with scan smoothing. J. nucl. Med. 13, 752–757 (1972)
Metz, C.E., Goodenough, D.J.: On failure to improve observer performance with scan smoothing: A rebuttal. J. nucl. Med. 14, 873–876 (1973)
Pratt, W.K.: Generalized Wiener filtering computation techniques. IEEE Trans. Comp. 21, 636–641 (1972)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Riihimäki, E., Häll, LE., Eistola, P. et al. Enhancement of abnormality in gamma images using Kohonen filters. Eur J Nucl Med 1, 259–262 (1976). https://doi.org/10.1007/BF00252174
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00252174