• Marius E Mayerhoefer, Martin J Breitenseher, Josef Kramer, Nicolas Aigner, Siegfried Hofmann, and Andrzej Materka.
• Osteoradiology Section, Department of Radiology, Medical University of Vienna, Austria. marius_mayerhoefer@aon.at
• J Magn Reson Imaging. 2005 Nov 1; 22 (5): 674-80.

PurposeTo investigate the reproducibility and transferability of texture features between MR centers, and to compare two feature selection methods and two classifiers.Materials And MethodsCoronal T1-weighted MR images of the knees of 63 patients, divided into three groups, were included in the study. MR images were obtained at three different MR centers. Regions of interest (ROIs) were drawn in the bone marrow and fat tissue. Then texture analysis (TA) of the ROIs was performed, and the most discriminant features were identified using Fisher coefficients and POE+ACC (probability of classification error and average correlation coefficients). Based on these features, artificial neural network (ANN) and k-nearest-neighbor (k-NN) classifiers were used for tissue discrimination.ResultsAlthough the texture features differed among the MR centers, features from one center could be successfully used for tissue discrimination in texture data on MR images from other centers. The best results were achieved using the ANN classifier in combination with features selected by POE+ACC.ConclusionThe differences in texture features extracted from MR images from different centers seem to have only a small impact on the results of tissue discrimination.J. Magn. Reson. Imaging 2005. (c) 2005 Wiley-Liss, Inc.

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