Exploring deep parametric embeddings for breast CADx

Andrew R. Jamieson; Rabi Alam; Maryellen L. Giger

doi:10.1117/12.878331

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4 March 2011 Exploring deep parametric embeddings for breast CADx

Andrew R. Jamieson, Rabi Alam, Maryellen L. Giger

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Proceedings Volume 7963, Medical Imaging 2011: Computer-Aided Diagnosis; 79630Y (2011) https://doi.org/10.1117/12.878331
Event: SPIE Medical Imaging, 2011, Lake Buena Vista (Orlando), Florida, United States

Abstract

Computer-aided diagnosis (CADx) involves training supervised classifiers using labeled ("truth-known") data. Often, training data consists of high-dimensional feature vectors extracted from medical images. Unfortunately, very large data sets may be required to train robust classifiers for high-dimensional inputs. To mitigate the risk of classifier over-fitting, CADx schemes may employ feature selection or dimension reduction (DR), for example, principal component analysis (PCA). Recently, a number of novel "structure-preserving" DR methods have been proposed¹. Such methods are attractive for use in CADx schemes for two main reasons. First, by providing visualization of highdimensional data structure, and second, since DR can be unsupervised or semi-supervised, unlabeled ("truth-unknown") data may be incorporated². However, the practical application of state-of-the-art DR techniques such as, t-SNE³, to breast CADx were inhibited by the inability to retain a parametric embedding function capable of mapping new input data to the reduced representation. Deep (more than one hidden layer) neural networks can be used to learn such parametric DR embeddings. We explored the feasibility of such methods for use in CADx by conducting a variety of experiments using simulated feature data, including models based on breast CADx features. Specifically, we investigated the unsupervised parametric t-SNE⁴ (pt-SNE), the supervised deep t-distributed MCML⁵ (dt-MCML), and hybrid semi-supervised modifications combining the two.

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Andrew R. Jamieson, Rabi Alam, and Maryellen L. Giger "Exploring deep parametric embeddings for breast CADx", Proc. SPIE 7963, Medical Imaging 2011: Computer-Aided Diagnosis, 79630Y (4 March 2011); https://doi.org/10.1117/12.878331

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