Cluster analysis of medical magnetic-resonance images data: diagnostic application and evaluation

Robert L. DeLapaz; Edward Herskovits; Vito Di Gesu; William J. Hanson; Ralph Bernstein

doi:10.1117/12.19984

1 August 1990 Cluster analysis of medical magnetic-resonance images data: diagnostic application and evaluation

Robert L. DeLapaz, Edward Herskovits, Vito Di Gesu, William J. Hanson, Ralph Bernstein

Proceedings Volume 1259, Extracting Meaning from Complex Data: Processing, Display, Interaction; (1990) https://doi.org/10.1117/12.19984
Event: Electronic Imaging: Advanced Devices and Systems, 1990, Santa Clara, CA, United States

Abstract

We describe the application of statistical clustering algorithms (approximate fuzzy C-means (AFCM) and ISODATA) and a Bayesian/maximum likelihood (BfML) classifier for data dimension reduction and information extraction with MRI. Analyses were performed on 140 cranial and 6 body MR image data sets obtained at 1.5 Tesla (GE Signa) with a variety of pathologies. Cluster analysis methods were run in an unsupervised mode and used to segment image data sets into 32 classes. Unsupervised classification of new image data sets was achieved by training the B/ML classifier on the 32 cluster data set and using the second-order statistics to assign each new image pixel to a cluster centroid in feature space. A translation table was then used to combine these cluster assignments into nine "superclusters" or tissue types. Tissue classification results were evaluated using visual assessment by a radiologic expert and by statistical comparison with a "gold standard" tissue map. Comparison of the newly classified data to the gold standard image using a confusion matrix showed an overall accuracy of 91%. We have found that this approach can improve the diagnostic specificity of MRI and can be applied to new data in an unsupervised mode with a high degree of accuracy.

Citation Download Citation

Robert L. DeLapaz, Edward Herskovits, Vito Di Gesu, William J. Hanson, and Ralph Bernstein "Cluster analysis of medical magnetic-resonance images data: diagnostic application and evaluation", Proc. SPIE 1259, Extracting Meaning from Complex Data: Processing, Display, Interaction, (1 August 1990); https://doi.org/10.1117/12.19984

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