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Your search keyword '"Aisen, Alex M."' showing total 27 results
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27 results on '"Aisen, Alex M."'

2. Unsupervised Feature Selection Applied to Content-Based Retrieval of Lung Images.

Author

Dy, Jennifer G., Brodley, Carla E., Avi Kak, Broderick, Lynn S., and Aisen, Alex M.

Subjects
IMAGE retrieval, IMAGE processing, LUNGS
Abstract

This paper describes a new hierarchical approach to content-based image retrieval called the "customized-queries" approach (CQA). Contrary to the single feature vector approach which tries to classify the query and retrieve similar images in one step. CQA uses multiple feature sets and a two-step approach to retrieval. The first stop classifies the query according to the class labels of the images using the features that best discriminate the classes. The second step then retrieves the most similar images within the predicted class using the features customized to distinguish "subclasses" within treat class. Needing to find the customized feature subset for each class led us to investigate feature selection for unsupervised learning. As a result, we developed a new algorithm called FSSEM (feature subset selection using expectation-maximization clustering). We applied our approach to a database of high resolution computed tomography lung images and show that CQA radically improves the retrieval precision over the single feature vector approach. To determine whether our CBIR system is helpful to physicians, we conducted an evaluation trial with eight radiologists. The results show that our system using CQA retrieval doubled the doctors' diagnostic accuracy. [ABSTRACT FROM AUTHOR]

Published
2003

4. A multisite phase III study of the safety and efficacy of a new manganese chloride-based gastrointestinal contrast agent for MRI of the abdomen and pelvis.

Author

Small, William C., DeSimone-Macchi, Debra, Parker, John R., Sukerkar, Arun, Hahn, Peter F., Rubin, Daniel L., Zelch, James V., Kuhlman, Janet E., Outwater, Eric K., Weinreb, Jeffrey C., Brown, Jeffrey J., de Lange, Eduard E., Woodward, Paula J., Arildsen, Ronald, Foster, Gregory S., Runge, Val M., Aisen, Alex M., Muroff, Lawrence R., Thoeni, Ruedi F., and Parisky, Yuri R.

Published
1999
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26. Magnetic resonance imaging.

Author

Aisen, Alex M.

Subjects
MAGNETIC Resonance Imaging (Book)
Abstract

Reviews the books `Magnetic Resonance Imaging,' Volumes 1 & 2, Second Edition, by David D. Stark and William G. Bradley Jr.

Published
1993
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27. Magnetic Resonance Imaging.

Author

Aisen, Alex M.

Subjects
MAGNETIC resonance imaging, NONFICTION
Abstract

Reviews the non-fiction book 'Clinical Magnetic Resonance Imaging,' edited by Robert R. Edelman and John R. Hesselink.

Published
1991
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