71 Hits in 3.9 sec

Averaging Centerlines: Mean Shift on Paths [chapter]

Theo van Walsum, Michiel Schaap, Coert T. Metz, Alina G. van der Giessen, Wiro J. Niessen
2008 Lecture Notes in Computer Science  
Carreira-Perpinan [5] ): x τ +1 = M m=1 G σ (|x τ − μ m |) M m =1 G σ (|x τ − μ m |) μ m , (1) where μ m represents the m th data point.  ...  The mean shift r i of path p i is then given by the following equation: r τ +1 i = j G σ (|r τ i − p j • s j |) k G σ (|r τ i − p k • s k |) p j • s j , (2) where the corresondence function s i may change  ... 
doi:10.1007/978-3-540-85988-8_107 fatcat:cqvdmawkjjgyhbmgcniwcgff2e

The influence of boundary conditions on wall shear stress distribution in patients specific coronary trees

Alina G. van der Giessen, Harald C. Groen, Pierre-André Doriot, Pim J. de Feyter, Antonius F.W. van der Steen, Frans N. van de Vosse, Jolanda J. Wentzel, Frank J.H. Gijsen
2011 Journal of Biomechanics  
Patient specific geometrical data on human coronary arteries can be reliably obtained multislice computer tomography (MSCT) imaging. MSCT cannot provide hemodynamic variables, and the outflow through the side branches must be estimated. The impact of two different models to determine flow through the side branches on the wall shear stress (WSS) distribution in patient specific geometries is evaluated. Murray's law predicts that the flow ratio through the side branches scales with the ratio of
more » ... e diameter of the side branches to the third power. The empirical model is based on flow measurements performed by Doriot et al. (2000) in angiographically normal coronary arteries. The fit based on these measurements showed that the flow ratio through the side branches can best be described with a power of 2.27. The experimental data imply that Murray's law underestimates the flow through the side branches. We applied the two models to study the WSS distribution in 6 coronary artery trees. Under steady flow conditions, the average WSS between the side branches differed significantly for the two models: the average WSS was 8% higher for Murray's law and the relative difference ranged from À 5% to +27%. These differences scale with the difference in flow rate. Near the bifurcations, the differences in WSS were more pronounced: the size of the low WSS regions was significantly larger when applying the empirical model (13%), ranging from À 12% to +68%. Predicting outflow based on Murray's law underestimates the flow through the side branches. Especially near side branches, the regions where atherosclerotic plaques preferentially develop, the differences are significant and application of Murray's law underestimates the size of the low WSS region.
doi:10.1016/j.jbiomech.2011.01.036 pmid:21349523 fatcat:mgklwscpxnhqhaxr7ixposlruy

Standardized evaluation methodology and reference database for evaluating coronary artery centerline extraction algorithms

Michiel Schaap, Coert T. Metz, Theo van Walsum, Alina G. van der Giessen, Annick C. Weustink, Nico R. Mollet, Christian Bauer, Hrvoje Bogunović, Carlos Castro, Xiang Deng
2009 Medical Image Analysis  
., 2001) , and a workshop and online evaluation framework for liver and caudate segmentation (van Ginneken et al., 2007) .  ...  Michiel Schaap, Coert Metz, Theo van Walsum and Wiro Niessen are supported by the Stichting voor de Technische Wetenschappen (STW) of The Netherlands Organization for Scientific Research (NWO).  ... 
doi:10.1016/ pmid:19632885 pmcid:PMC3843509 fatcat:zakl4k2a6jgf3ezpigkfcxv27a

Small coronary calcifications are not detectable by 64-slice contrast enhanced computed tomography

Alina G. van der Giessen, Frank J. H. Gijsen, Jolanda J. Wentzel, Pushpa M. Jairam, Theo van Walsum, Lisan A. E. Neefjes, Nico R. Mollet, Wiro J. Niessen, Frans N. van de Vosse, Pim J. de Feyter, Antonius F. W. van der Steen
2010 The International Journal of Cardiovascular Imaging  
Recently, small calcifications have been associated with unstable plaques. Plaque calcifications are both in intravascular ultrasound (IVUS) and multi-slice computed tomography (MSCT) easily recognized. However, smaller calcifications might be missed on MSCT due to its lower resolution. Because it is unknown to which extent calcifications can be detected with MSCT, we compared calcification detection on contrast enhanced MSCT with IVUS. The coronary arteries of patients with myocardial
more » ... n or unstable angina were imaged by 64-slice MSCT angiography and IVUS. The IVUS and MSCT images were registered and the arteries were inspected on the presence of calcifications on both modalities independently. We measured the length and the maximum circumferential angle of each calcification on IVUS. In 31 arteries, we found 99 calcifications on IVUS, of which only 47 were also detected on MSCT. The calcifications missed on MSCT (n = 52) were significantly smaller in angle (27°± 16°vs. 59°± 31°) and length (1.4 ± 0.8 vs. 3.7 ± 2.2 mm) than those detected on MSCT. Calcifications could only be detected reliably on MSCT if they were larger than 2.1 mm in length or 36°in angle. Half of the calcifications seen on the IVUS images cannot be detected on contrast enhanced 64slice MSCT angiography images because of their size. The limited resolution of MSCT is the main reason for missing small calcifications.
doi:10.1007/s10554-010-9662-8 pmid:20602171 pmcid:PMC3035782 fatcat:6vx2oxpi5zd6hkuuvcyijl7msa

3D fusion of intravascular ultrasound and coronary computed tomography for in-vivo wall shear stress analysis: a feasibility study

Alina G. van der Giessen, Michiel Schaap, Frank J. H. Gijsen, Harald C. Groen, Theo van Walsum, Nico R. Mollet, Jouke Dijkstra, Frans N. van de Vosse, Wiro J. Niessen, Pim J. de Feyter, Antonius F. W. van der Steen, Jolanda J. Wentzel
2009 The International Journal of Cardiovascular Imaging  
Thus the position of C and the normals N , fN 1 ; . . .; N n g of the IVUS images are now known. 3.  ...  .; N n g the software tool reformatted a set of MPR CT images, with each MPR CT image corresponding to one IVUS image.  ... 
doi:10.1007/s10554-009-9546-y pmid:19946749 fatcat:l6knhwzxdbd4dczqhhsldi66vu

Standardized evaluation methodology and reference database for evaluating coronary artery centerline extraction algorithms

Coert T. Metz, Xiang Deng, Carlos Castro, Nico R. Mollet, Hrvoje Bogunović, Annick C. Weustink, Theo van Walsum, Michiel Schaap, Alina G. van der Giessen, Christian Bauer
Table 8 Ranks per image quality; poor(P), moderate(M) or good(G), calcium score; low(L), moderate(M) or severe(S) and vessel type.  ...  average the automatic methods perform relatively worse for datasets with poor image quality (i.e. the ranks of the automatic methods in the P-column are on average higher compared to the ranks in the M-and G-column  ... 
doi:10.17615/hakw-0w15 fatcat:avjiv6e3d5hvpedqv442ld5hku

Page 9857 of Mathematical Reviews Vol. , Issue 2003m [page]

2003 Mathematical Reviews  
J Vazquez-Poritz, Justi Vdovina, Alina Veca, Alessandro Veeravalli, Venugopal de Vega, I. van der Vegt, J. J. W Vegt, J. W.  ...  Vandem-Bimden Be icici cs cecsecees Vanderbei, Robert J Van der Giessen, E. Vandermeirsh, Frédéric Vanderwerff, J. .... See Vanderwerff, Jon D. Vanderwerff, Jon D. 58006 81229 33011 Vandewalle, B.  ... 

Wall Shear Stress Distribution in Patient Specific Coronary Artery Bifurcation

2010 American Journal of Applied Sciences  
Wentzel, Alina G. van der Giessen and (Department of Biomedical Engineering, Thoraxcenter, Erasmus Medical Center, Rotterdam) for their technical and computational support.  ...  ., 2008; van der Giessen et al., 2009; Goubergrits et al., 2009; .  ... 
doi:10.3844/ajassp.2010.1237.1242 fatcat:5r6exw6gurbijj2775cxvz22aq


2017 Biomedical Engineering  
, Germany; , ); Philip von Voigts-Rhetz (THM-Gießen, Germany; , ); Klemens Zink (THM-Gießen, Germany; , ) Poster session 9 Dosimetry, radiation protection and radiation biology II P 83 11.09.2017  ...  in Medical Physics (10-13 September 2017, Dresden/DE) Title Authors (affiliation and country) Session ID Session Abstract ID Session date Session start time Multi-modal imaging Frank G.  ... 
doi:10.1515/bmt-2017-frontmatter-s1 fatcat:u2fn4n7zonaklahfd6pj37pzna

Abstracts des Kongresses für Kinder- und Jugendmedizin 2019

2019 Monatsschrift fur Kinderheilkunde  
Es wurden Infektionen mit Influenza (44 %), Varizellen (16 %) und anderen (20 % e. g. Diphtherie, Pertussis, Masern, Pneumokken und Meningokokken-Infektion) berichtet.  ...  Die Analyse der Zielerreichung zeigte, dass insgesamt 63 % der vordefinierten therapeutischen Ziele in der HGT erreicht wurden.  ...  DGSPJ-PO 42 Sozialstatus, Diabetesoutcomes und Diabetesversorgung bei Kindern und Jugendlichen mit Typ-1 Diabetes in Deutschland: Die Ergebnisse der DIAS-Studie (Diabetes and Social Disparities) Esther  ... 
doi:10.1007/s00112-019-0759-4 fatcat:2ip32it2kjdgpieygpyvdy62oy

Integration and potential of teaching communication skills in the study of veterinary medicine in Germany

Alina Pohl, Luise Grace Klass, Christin Kleinsorgen, Dora Bernigau, Birte Pfeiffer-Morhenn, Stefan Arnhold, Marc Dilly, Christina Beitz-Radzio, Lena Vogt, Mahtab Bahramsoltani, Universitätsbibliothek Der FU Berlin
Van Beukelen P, van der Maazen W. Programme Outcomes of the Veterinary Curriculum. Utrecht: Utrecht University, Faculty of Veterinary Medicine; 2006. 40. Weinberger S.  ...  Alina Pohl ist wissenschaftliche Mitarbeiterin an der Tierklinik für Fortpflanzung.  ... 
doi:10.17169/refubium-30434 fatcat:2fegnk6pxvfpragymnvneh3kn4

Gleich und doch verschieden – Personalisierte Schmerzmedizin

2020 Der Schmerz (Berlin. Print)  
Werden wir in Zukunft Therapieentscheidungen auf der Grundlage genetischer Profile oder der Analyse von anderen Datensätzen vornehmen können und damit erfolgreicher sein?  ...  Der Präsenzteil am Donnerstag und Freitag findet mit begrenzter Teilnehmerzahl im Rosengarten statt, der Mittwoch und Samstag stehen zusätzlich für Online-Formate zur Verfügung.  ...  SDI(G) = 35,5; S(M) = 9,5 vs. S(G) = 8,3; D(M) = 12 vs. D(G) = 13; I(M) = 14 vs. I(G) = 14.  ... 
doi:10.1007/s00482-020-00499-1 pmid:33057797 fatcat:png2xkplmzfvlcirkpz5xlpk3m


:None, DuEPublico: Duisburg-Essen Publications Online, University Of Duisburg-Essen, Jenny Bünnig, Beate Kortendiek, Uta Schmidt
2021 Journal Netzwerk Frauen- und Geschlechterforschung NRW  
Ziel war es, die Wechselwirkungen der drei o. g.  ...  Auffallend ist, dass G seine Antworten im Interview durchgängig in der Wir-Form formuliert, beispielsweise "Wir vermeiden den tiefen Unterzucker" (G 127).  ...  Dass mich unsere Feinde ja nicht loslassen, wenn sie mich eines Tages gefasst haben, denn ich kämpfe nicht zum Vergnügen, sondern wie ein Mensch, der wirklich kämpfen will und der es an der Zeit findet  ... 
doi:10.17185/duepublico/74537 fatcat:2lefh3juj5bypk4nkudvauhv7a

"Wissen schaffen – Wissen leben"

2021 Der Schmerz (Berlin. Print)  
der gesellschaftlichen Verunsicherung.  ...  Wir haben während der Pandemie 2019/2020 schmerzhafte Änderungen unseres Alltages erfahren, der menschliche Kontakt, der gemeinsame Austausch und das zusammen Wirken sind Werte, die deutlicher in unser  ...  Bigalke S, Maeßen TV, Schnabel K, Kaiser U, Segelcke D, Meyer-Frießem CH, Sonstiges 3. van Boekel RLM, Vissers KCP, van der Sande R et al (2017) Moving beyond Liedgens H, Machácek PA, Zahn P, Pogatzki-Zahn  ... 
doi:10.1007/s00482-021-00580-3 pmid:34648065 fatcat:6uqkkdnl6rg37pkeccclgiawxi

Abstracts zum 124. Kongress der Deutschen Gesellschaft für Innere Medizin e.V

2018 Der Internist  
; Martin Roderfeld¹; Elke Roeb¹ ¹Justus-Liebig-Universität Gießen, Gießen; ²Max-Planck-Institut für Infektionsbiologie, Berlin Einleitung: Die Therapie der chronischen Hepatitis B mit Interferon-alpha  ...  Eine prädiktive Bedeutung der Sarkopenie konnte bei Patienten mit MC für den weiteren Krankheitsverlauf nicht nachgewiesen werden. ) van Vugt, J.L.A. et al.  ...  In der ambulanten vertragsärztlichen Versorgung nutzen Ärzte bei der Dokumentation von Diagnosen häu g die in der Software hinterlegte Schlagwortsuche.  ... 
doi:10.1007/s00108-018-0419-0 pmid:29572557 fatcat:thqq2msfrnf23poa6fp6feyol4
« Previous Showing results 1 — 15 out of 71 results