| 1. |
- Kirişli, Hortense, et al.
(author)
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Standardized evaluation framework for evaluating coronary artery stenosis detection, stenosis quantification and lumen segmentation algorithms in computed tomography angiography
- 2013
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In: Medical Image Analysis. - : Elsevier. - 1361-8415 .- 1361-8423. ; 17:8, s. 859-876
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Journal article (peer-reviewed)abstract
- Though conventional coronary angiography (CCA) has been the standard of reference for diagnosing coronary artery disease in the past decades, computed tomography angiography (CIA) has rapidly emerged, and is nowadays widely used in clinical practice. Here, we introduce a standardized evaluation framework to reliably evaluate and compare the performance of the algorithms devised to detect and quantify the coronary artery stenoses, and to segment the coronary artery lumen in CIA data. The objective of this evaluation framework is to demonstrate the feasibility of dedicated algorithms to: (I) (semi-)automatically detect and quantify stenosis on CIA, in comparison with quantitative coronary angiography (QCA) and CIA consensus reading, and (2) (semi-)automatically segment the coronary lumen on CIA, in comparison with expert's manual annotation. A database consisting of 48 multicenter multivendor cardiac CIA datasets with corresponding reference standards are described and made available. The algorithms from 11 research groups were quantitatively evaluated and compared. The results show that (1) some of the current stenosis detection/quantification algorithms may be used for triage or as a second-reader in clinical practice, and that (2) automatic lumen segmentation is possible with a precision similar to that obtained by experts. The framework is open for new submissions through the website, at http://coronary.bigr.nl/stenoses/.
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| 2. |
- Hamnerius, Yngve, 1950, et al.
(author)
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Distribution of ELF magnetic fields in Swedish dwellings
- 2011
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In: 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011, Istanbul, 13-20 August 2011. - 9781424451173
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Conference paper (peer-reviewed)abstract
- The purpose of this study is to assess the distribution of magnetic fields in the frequency range 10 Hz - 2000 Hz in randomly selected Swedish dwellings. The fields were measured in up to 3 rooms in each residence. In the master bedroom a 24 h logging of the fields was performed. The results show that 89 % of the measured houses have average magnetic fields below 0.2 μT with mean value of 0.11 μT and median value 0.05 μT. The comparison of magnetic fields in urban and rural area show that the lowest fields were found in rural areas with 97% of the residences have average magnetic fields below 0.2 μT with median value 0.04 μT. Comparing villas and apartments show that the median magnetic fields value for apartments is 0.07 μT compared to 0.04 μT for villas. The dominating frequency of the magnetic field was 50 Hz. The total harmonic distortion (THD) of the magnetic field was measured; the median value of THD was 10.3 %.
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| 3. |
- Samimi-Rad, K., et al.
(author)
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Patient-to-Patient Transmission of Hepatitis C at Iranian Thalassemia Centers Shown by Genetic Characterization of Viral Strains
- 2013
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In: Hepatitis Monthly. - : Briefland. - 1735-143X .- 1735-3408. ; 13:1
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Journal article (peer-reviewed)abstract
- Background: Hepatitis C is prevalent among thalassemia patients in Iran. It is mainly transfusion mediated, in particular among patients treated before 1996 when blood screening was introduced. Objectives: The current study aimed to investigate why patients still seroconvert to anti-HCV in Iranian thalassemia centers. Patients and Methods: During 2006-2007 sera were sampled from 217 anti-HCV positive thalassemia patients at nine thalassemia centers in Tehran and Amol city, where 34 (16%) patients had been infected after 1996. The HCV subtype could be determined by sequencing and .NCR-core region in 130 strains׳5 phylogenetic analysis of partial NS5B and/or Results: 1a (53%) was predominant followed by 3a (30%), 1b (15%), and one strain each of 2k, 3k and 4a. Phylogenetic analysis revealed 19 clades with up to ve strains diverging with less than six nucleotides from each other within subtypes 1a and 3a. Strains in seven cla des were from nine patients infected between 1999 and 2005 and similar to strains from eight patients infected before 1996, indicating ongoin g transmission at the centers. Further epidemiological investigation revealed that 28 patients infected with strains within the same clade had frequently been transfused at the same shift sitting on the same bed. An additional eight patients with related strains had frequently bee n transfused simultaneously in the same room. Conclusions: The results suggest nosocomial transmission at these thalassemia centers both before and after the introduction of blood screening. Further training of sta and strict adherence to preventive measures are thus essential to reduce the incidence of new HCV infections.
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| 4. |
- Eslami Kiasari, Abbas, et al.
(author)
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Analytical approaches for performance evaluation of networks-on-chip
- 2012
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In: CASES'12 - Proceedings of the 2012 ACM International Conference on Compilers, Architectures and Synthesis for Embedded Systems, Co-located with ESWEEK. - New York, NY, USA : ACM. - 9781450314244 ; , s. 211-212
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Conference paper (peer-reviewed)abstract
- This tutorial reviews four popular mathematical formalisms - dataflow analysis, schedulability analysis, network calculus, and queueing theory - and how they have been applied to the analysis of Network-on-Chip (NoC) performance. We review the basic concepts and results of each formalism and provide examples of how they have been used in on-chip communication performance analysis. The tutorial also discusses the respective strengths and weaknesses of each formalism, their suitability for a specific purpose, and the attempts that have been made to bridge these analytical approaches. Finally, we conclude the tutorial by discussing open research issues.
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