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| 2. |
- Chodorowski, Artur, 1959-, et al.
(författare)
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Histology-based oral lesion discrimination
- 2009
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Ingår i: Medicinteknikdagarna 2009 - Book of Abstracts, Sept 28-29, 2009, Västerås, Sweden.
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Konferensbidrag (refereegranskat)
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| 3. |
- Mahmood, Qaiser, 1981-, et al.
(författare)
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A novel Bayesian approach to adaptive mean shift segmentation of brain images
- 2012
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Ingår i: Proceedings - IEEE Symposium on Computer-Based Medical Systems. 25th IEEE International Symposium on Computer-Based Medical Systems, CBMS 2012, Rome, 20 - 22 June 2012. - 1063-7125. - 978-146732051-1
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Konferensbidrag (refereegranskat)abstract
- We present a novel adaptive mean shift (AMS) algorithm for the segmentation of tissues in magnetic resonance (MR) brain images. In particular we introduce a novel Bayesian approach for the estimation of the adaptive kernel bandwidth and investigate its impact on segmentation accuracy. We studied the three class problem where the brain tissues are segmented into white matter, gray matter and cerebrospinal fluid. The segmentation experiments were performed on both multi-modal simulated and real patient T1-weighted MR volumes with different noise characteristics and spatial inhomogeneities. The performance of the algorithm was evaluated relative to several competing methods using real and synthetic data. Our results demonstrate the efficacy of the proposed algorithm and that it can outperform competing methods, especially when the noise and spatial intensity inhomogeneities are high.
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| 4. |
- Shirvany, Yazdan, 1980-, et al.
(författare)
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Non-invasive EEG source localization using particle swarm optimization: A clinical experiment
- 2012
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Ingår i: 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 2012, San Diego, CA, 28 August - 1 September 2012. - 1557-170X. - 978-142444119-8 ; s. 6232-6235
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Konferensbidrag (refereegranskat)abstract
- One of the most important steps of pre-surgical diagnosis in patients with medically intractable epilepsy is to find the precise location of the epileptogenic foci. An Electroencephalography (EEG) is a non-invasive standard tool used at epilepsy surgery center for pre-surgical diagnosis. In this paper a modified particle swarm optimization (MPSO) method is applied to a real EEG data, i.e., a somatosensory evoked potentials (SEPs) measured from a healthy subject, to solve the EEG source localization problem. A high resolution 1 mm hexahedra finite element volume conductor model of the subject's head was generated using T1-weighted magnetic resonance imaging data. An exhaustive search pattern and the MPSO method were then applied to the peak of the averaged SEPs data. The non-invasive EEG source analysis methods localized the somatosensory cortex area where our clinical expert expected the received SEPs. The proposed inverse problem solver found the global minima with acceptable accuracy and reasonable number of iterations.
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| 5. |
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| 6. |
- Anderson, Johan, 1973-, et al.
(författare)
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A comparison of drift wave stability in stellarator and tokamak geometry
- 2002
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Ingår i: Physics of Plasmas. ; 9:5
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Tidskriftsartikel (refereegranskat)abstract
- The influence of plasma geometry on the linear stability of electrostatic ion-temperature-gradient driven drift modes (ITG modes) is investigated. An advanced fluid model is used for the ions together with Boltzmann distributed electrons. The derived eigenvalue equation is solved numerically. A comparison is made between an H – 1NF [Fusion Technol. 17, 123 (1990)] like stellarator equilibrium, a numerical tokamak equilibrium and the analytical s - alpha equilibrium. The numerical and the analytical tokamak are found to be in good agreement in the low inverse aspect ratio limit. The growth rates of the tokamak and stellarator are comparable whereas the modulus of the real frequency is substantially larger in the stellarator. The threshold in Ln/LT for the stellarator is found to be somewhat larger. In addition, a stronger stabilization of the ITG mode growth is found for large L n / R in the stellarator case.
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| 7. |
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| 8. |
- Dahlbäck, Robin, 1985-, et al.
(författare)
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A 340 GHz CW non-linear imaging system
- 2010
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Ingår i: Infrared Millimeter and Terahertz Waves (IRMMW-THz), 2010. - 978-1-4244-6655-9
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Konferensbidrag (refereegranskat)abstract
- A CW sub-millimetre wave imaging system is presented. The system operates around 340GHz with a 6.5% relative bandwidth and uses a non-linear imaging algorithm.
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| 9. |
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| 10. |
- Dahlbäck, Robin, 1985-, et al.
(författare)
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A System for THz Imaging of Low-Contrast Targets Using the Born Approximation
- 2012
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Ingår i: IEEE Transactions on Terahertz Science and Technology. - 2156-342X. ; 2:3, s. 361-370
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Tidskriftsartikel (refereegranskat)abstract
- A THz imaging system, operating at 346 GHz and tailored for implementation of an imaging algorithm based on the Born approximation, is presented. The imaging algorithm provides focusing by compensating for the antenna footprint. This allows for using a more simple antenna system without optical focusing. Several aspects of implementing an imaging algorithm based on the Born approximation in THz imaging are discussed and key system properties are highlighted. The performance of the imaging algorithm is verified by imaging two simple dielectric targets. The results indicate that this approach provides a qualitative indication of the distribution of contrast in the samples complex permittivity and is a potential complement to existing imaging techniques.
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