- New methods for extremity imaging using MRI for clinical applications
- Development of optical methods for nanoelectronics
- Occluded Image Object Recognition using Localized Nonnegative Matrix Factorization Methods
Result 1: New methods for extremity imaging using MRI for clinical applications
Projects: VEGA 2/0090/11 and ŠPVV no. 2003SP200280203. (Institute of Measurement Science, SAS)
Authors: V. Juráš, L. Valkovič, P. Szomolányi, I. Frollo, D. Gogola, J. Přibil, T. Dermek
New methods for enhancing the quality of the images from MRI (Magnetic Resonance Imaging) were designed, experimentally tested and clinically validated. The organs of interest were: knee joint, ankle, Achilles tendon, hand, liver and vocal tract. New sequences for imaging and spectroscopy have been developed in cooperation with international partner. The comparison measurements have been performed at magnetic field strengths 0.18T, 3.0T and 7T and the spectroscopic measurement have been performed at 3.0T. The investigation has been performed in estimation of relaxation constants in Achilles tendon. The effect of caffeine and alcohol has been tested by imaging of vessels dilatation under the influence with above mentioned substances. The method for diaphragm movement monitoring has been developed, for improving the liver spectroscopy. The fast sequence for imaging vocal tract has been designed as well. All methods have been tested on volunteers. The methods can be applied in patients at orthopedic clinics for patients follow-up.
International cooperation: Univ.-Prof. Dr. Siegfried Trattnig, MR Center, Highfield MR, Department of Radiology, Medical University of Vienna, Austria. Agreement for Scientific Cooperation, 28.8.2006 and 24.8.2009.
Fig. 1 left: The image of the left hand with the regions influenced by caffeine. Right: The image of vocal tract with region-of-interests being investigated.
Publications:
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JURÁŠ, Vladimír - WELSCH, G. - VALKOVIČ, Ladislav - SZOMOLÁNYI, Pavol - NÖBAUER-HUHMANN, I-M. - FROLLO, Ivan - TRATTNIG, S. The comparison of the performance of MRI clinical sequences for ankle imaging at 3T vs 7T. In Proceedings of the International Society for Magnetic Resonance in Medicine (ISMRM 2011) : 19th Annual Meeting & Exhibition. Editori D.F. Abbott, J.H. Ackermann et al. - Berkeley, CA, USA : ISMRM, 2011. ISSN 1545-4428, p. 3195. CD-ROM.
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VALKOVIČ, Ladislav - JURÁŠ, Vladimír - DERMEK, Tomáš - VOJTÍŠEK, Lubomír - FROLLO, Ivan. Low field NMR : The effect of stress on MR image contrast of the human hand. In YBERC 2010 : The 4th Biomedical Engineering Conference of Young Biomedical Engineers and Researches. Editori : Kolektív autorov. - Košice : Technická univerzita v Košiciach, 2011. ISBN 978-80-553-0596-7. p. 1-4. CD-ROM.
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GOGOLA, Daniel - VALKOVIČ, Ladislav - PŘIBIL, Jiří - DERMEK, Tomáš - VOJTÍŠEK, Lubomír - FROLLO, Ivan. Design and construction of a head probe coil for vocal tract imaging. In MEASUREMENT 2011 : Proceedings of the 8th International Conference on Measurement. Editori J. Maňka, V. Witkovský, M. Tyšler, I. Frollo. - Bratislava : Institute of Measurement Science SAS, 2011. ISBN 978-80-969-672-4-7, p. 360-363.
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VALKOVIČ, Ladislav - JURÁŠ, Vladimír - GOGOLA, Daniel - VOJTÍŠEK, Lubomír - FROLLO, Ivan. Low-field BOLD effect induced by alcohol and caffeine measured in the upper limb: A feasibility study. In MEASUREMENT 2011 : Proceedings of the 8th International Conference on Measurement. Editori J. Maňka, V. Witkovský, M. Tyšler, I. Frollo. - Bratislava : Institute of Measurement Science SAS, 2011. ISBN 978-80-969-672-4-7, p. 356-359.
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JURÁŠ, Vladimír - ZBYN, S. - PRESSL, Ch. - SZOMOLÁNYI, Pavol - FROLLO, Ivan - TRATTNIG, S. In vivo measurement of fast transversal relaxation times of achilles tendon using ultra-high field MRI. In MEASUREMENT 2011 : Proceedings of the 8th International Conference on Measurement. Editori J. Maňka, V. Witkovský, M. Tyšler, I. Frollo. - Bratislava : Institute of Measurement Science SAS, 2011. ISBN 978-80-969-672-4-7, p. 352-355.
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PŘIBIL, Jiří - HORÁČEK, J. - HORÁK, P. Two methods of mechanical noise reduction of recorded speech during phonation in an MRI device. In Measurement Science Review : journal published by Institute Measurement Science, Slovak Academy of Sciences, 2011, vol. 11, no. 3, p. 92-98. ISSN 1335-8871. (0.400-IF2010)
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HOCK, A. - VALKOVIČ, Ladislav - BOESIGER, P. - HENNING, A. Navigator based respiratory gating during acquisition and preparation phases for proton liver spectroscopy at 3T. In ESMRMB 2011 Congress. Leipzig, Germany, October 6-8, 2011.
Result 2: Development of optical methods for nanoelectronics
Projects: -
Author: M. Hain
Long-term scientific cooperation with Japan's
Institute "Nanoelectronics
Research Institute, National Institute of
Advanced Industrial Science and Technology", Tsukuba, Japan is aimed at the
development of optical measurement
methods for nanoelectronics.
Alpha
The cooperation is carried out
under a written agreement "Memorandum
of Understanding" signed by
directors of partner institutes.
In 2011, cooperation was focused on the development of optical
methods for characterization of
materials for nanoelectronics
and other application
areas. A new method of the scattering measurement of
optical radiation incident on
the surface of the material under study
using a special designed
optics (hemispherical lens with high
refractive index, image guide and twin ellipsoidal mirror), a
digital CCD camera and computer with
specialized software was proposed.
Alpha
The proposed method was experimentally
verified and the experimental
device Scatterometer for the fast measurement of a distribution function of reflected light was developed.
Fig.1. Developed Scatterometer device for fast and precise measurement of distribution function of reflected light.
Obr.2. User interface of the developed measuring software for the Scatterometer device.
Publication:
- KAWATE, E. - HAIN, M.: Development of a scatterometer for spatial distribution measurements of reflected and transmitted light from diffuse surfaces. In: MEASUREMENT 2011. Proceedings of the 8th International Conference on Measurement. Bratislava, Institute of Measurement Science SAS, 2011, 192-196.
Result 3: Occluded Image Object Recognition using Localized Nonnegative Matrix Factorization Methods
Projects: VEGA 2/0019/10 (Institute of Measurement Science SAS)
Authors: I.Bajla, S.Štolc
In the domain of image data representation using vector subspaces, the interest of computer vision cummunity has been recently attracted by the methods of non-negative matrix factorization (NMF). Within our research intentions, we have concentrated on the analysis of NMF methodology from the viewpoint of the part-based principle that was claimed to be suitable for solving the problems of image object recognition. We have proposed a novel „modular" NMF method that preserves vector sparsity conditions, but for NMF vector subspaces it simultaneously provides such vector bases which directly correspond to the individual image parts. We have carried out comparative computer tests with the aim to benchmark the performance of the known NMF algorithms, applied to the complex task of image object recognition including object occlusions, with our novel approach. We made use of the known public databases of human faces (ORL and YALE), which had to be geometrically normalized. Also, we have proposed alternative types of object occlusions in test images. The comparison of the obtained results confirmed the contribution of the proposed modification of the NMF method (higher values of classification accuracy) for normalized data of face images with occlusions.
Foreign partner: Austrian Institute of Technology GmbH, Seibersdorf, Austria
Fig.: Illustration of the NMF task in 2D vector space: A, B - training sets, (w1, w2) - NMF subspace that corresponds to the given sets, HA, HB -projections of the training set elements onto the subspace implicitely given by the matrix H in the NMF algorithm (V = H .W).
Publications:
- BAJLA, I. - SOUKUP, D. - ŠTOLC, S.: Object recognition. Chapter 6 (s.83-106): "Occluded image object recognition using localized nonnegative matrix factorization methods", Tam Phuong Cao, InTech open access publisher, Rijeka, 2011, 350 s.
- SOUKUP, D. - BAJLA, I.: Robust object recognition under partial occlusions using NMF. Computational Intelligence and Neuroscience, 2008, Article ID 857453, 14 s, 2008, doi: 10.1155/2008/857453.
- BAJLA, I.- SOUKUP, D.: A modular non-negative matrix factorization for parts-based object recognition using subspace representation. In: SPIE Proceedings of the Int. Conference Electronic Imaging, San Jose, CA, USA, január 2008, (eds): Kurt S.Niel, and David Fofi, SPIE Vol. 6813, 68130C-1, 9 s.
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Selected Results 