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Träfflista för sökning "hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Medicinteknik) hsv:(Medicinsk bildbehandling) ;pers:(Frimmel Hans)"

Sökning: hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Medicinteknik) hsv:(Medicinsk bildbehandling) > Frimmel Hans

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Numrering	Referens	Omslagsbild	Hitta
1.	Lidayová, Kristína, et al. (författare) Fast vascular skeleton extraction algorithm 2016 Ingår i: Pattern Recognition Letters. - : Elsevier. - 0167-8655 .- 1872-7344. ; 76, s. 67-75 Tidskriftsartikel (refereegranskat)abstract Vascular diseases are a common cause of death, particularly in developed countries. Computerized image analysis tools play a potentially important role in diagnosing and quantifying vascular pathologies. Given the size and complexity of modern angiographic data acquisition, fast, automatic and accurate vascular segmentation is a challenging task.In this paper we introduce a fully automatic high-speed vascular skeleton extraction algorithm that is intended as a first step in a complete vascular tree segmentation program. The method takes a 3D unprocessed Computed Tomography Angiography (CTA) scan as input and produces a graph in which the nodes are centrally located artery voxels and the edges represent connections between them. The algorithm works in two passes where the first pass is designed to extract the skeleton of large arteries and the second pass focuses on smaller vascular structures. Each pass consists of three main steps. The first step sets proper parameters automatically using Gaussian curve fitting. In the second step different filters are applied to detect voxels - nodes - that are part of arteries. In the last step the nodes are connected in order to obtain a continuous centerline tree for the entire vasculature. Structures found, that do not belong to the arteries, are removed in a final anatomy-based analysis. The proposed method is computationally efficient with an average execution time of 29s and has been tested on a set of CTA scans of the lower limbs achieving an average overlap rate of 97% and an average detection rate of 71%.
2.	Wang, Chunliang, 1980-, et al. (författare) Fast level-set based image segmentation using coherent propagation 2014 Ingår i: Medical physics (Lancaster). - : John Wiley and Sons Ltd. - 0094-2405. ; 41:7 Tidskriftsartikel (refereegranskat)abstract Purpose: The level-set method is known to require long computation time for 3D image segmentation, which limits its usage in clinical workflow. The goal of this study was to develop a fast level-set algorithm based on the coherent propagation method and explore its character using clinical datasets. Methods: The coherent propagation algorithm allows level set functions to converge faster by forcing the contour to move monotonically according to a predicted developing trend. Repeated temporary backwards propagation, caused by noise or numerical errors, is then avoided. It also makes it possible to detect local convergence, so that the parts of the boundary that have reached their final position can be excluded in subsequent iterations, thus reducing computation time. To compensate for the overshoot error, forward and backward coherent propagation is repeated periodically. This can result in fluctuations of great magnitude in parts of the contour. In this paper, a new gradual convergence scheme using a damping factor is proposed to address this problem. The new algorithm is also generalized to non-narrow band cases. Finally, the coherent propagation approach is combined with a new distance-regularized level set, which eliminates the needs of reinitialization of the distance. Results: Compared with the sparse field method implemented in the widely available ITKSnap software, the proposed algorithm is about 10 times faster when used for brain segmentation and about 100 times faster for aorta segmentation. Using a multiresolution approach, the new method achieved 50 times speed-up in liver segmentation. The Dice coefficient between the proposed method and the sparse field method is above 99% in most cases. Conclusions: A generalized coherent propagation algorithm for level set evolution yielded substantial improvement in processing time with both synthetic datasets and medical images.
3.	Acosta, Oscar, et al. (författare) Filtering and restoration of structures in 3D ultrasound images 2007 Ingår i: Proc. 4th International Symposium on Biomedical Imaging. - Piscataway, NJ : IEEE. - 1424406722 ; , s. 888-891 Konferensbidrag (refereegranskat)
4.	Acosta, Oscar, et al. (författare) Pyramidal flux in an anisotropic diffusion scheme for enhancing structures in 3D images 2008 Ingår i: Medical Imaging 2008. - Bellingham, WA : SPIE. - 9780819470980 ; , s. 691429:1-12 Konferensbidrag (refereegranskat)
5.	Egevad, Lars, et al. (författare) Biopsy protocol stability in a three-dimensional model of prostate cancer : Changes in cancer yield after adjustment of biopsy positions 1999 Ingår i: Urology. - 0090-4295 .- 1527-9995. ; 54, s. 862-868 Tidskriftsartikel (refereegranskat)
6.	Egevad, Lars, et al. (författare) Three-dimensional computer reconstruction of prostate cancer from radical prostatectomy specimens : Evaluation of the model by core biopsy simulation 1999 Ingår i: Urology. - 0090-4295 .- 1527-9995. ; 53, s. 192-198 Tidskriftsartikel (refereegranskat)
7.	Frimmel, Hans, et al. (författare) Automatic registration and error detection of multiple slices using landmarks 2001 Ingår i: Analytical Cellular Pathology. - 0921-8912 .- 1878-3651. ; 23, s. 159-165 Tidskriftsartikel (refereegranskat)
8.	Frimmel, Hans (författare) Biopsy Needle Optimisation 1997 Ingår i: Proc. 10th Scandinavian Conference on Image Analysis. - : Pattern Recognition Society of Finland. - 9517641451 ; , s. 381-387 Konferensbidrag (refereegranskat)
9.	Frimmel, Hans, et al. (författare) Centerline-based colon segmentation for CT colonography 2005 Ingår i: Medical physics (Lancaster). - : Wiley. - 0094-2405. ; 32, s. 2665-2672 Tidskriftsartikel (refereegranskat)
10.	Frimmel, Hans, et al. (författare) Fast and robust computation of colon centerline in CT colonography 2004 Ingår i: Medical physics (Lancaster). - : Wiley. - 0094-2405. ; 31, s. 3046-3056 Tidskriftsartikel (refereegranskat)

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Resultat 1-10 av 32

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Typ av publikation: tidskriftsartikel (17); konferensbidrag (13); doktorsavhandling (2)

Typ av innehåll: refereegranskat (30); övrigt vetenskapligt/konstnärligt (2)

Författare/redaktör: Frimmel, Hans (30)Ta bort avgränsningen; Smedby, Örjan (7); Bengtsson, Ewert (7); Näppi, Janne (7); Yoshida, Hiroyuki (7); Lidayová, Kristína (6); visa fler...; Egevad, Lars (5); Busch, Christer (5); Johansson, Lars (4); Ahlström, Håkan (4); Ourselin, Sébastien (4); Acosta, Oscar (3); Fenster, Aaron (3); Kullberg, Joel (3); Wang, Chunliang, 198 ... (3); Lönn, Lars, 1956 (2); Bengtsson, Ewert, Pr ... (2); Mattson, Stefan (2); Lindblad, Joakim (2); Sladoje, Nataša (2); Wang, Chunliang (2); Angelhed, Jan-Erik, ... (2); Carlbom, Ingrid (2); Brandberg, John, 196 ... (2); Norberg, Mona (2); Smedby, Örjan, 1956- (1); Salvado, Olivier (1); Sintorn, Ida-Maria (1); Persson, Anders (1); Smedby, Örjan, Profe ... (1); Borgefors, Gunilla (1); Strid, L. (1); Bergelin, Eva, 1950 (1); Gupta, Anindya (1); Hansen, Tomas (1); Lin, Qingfen (1); Frimmel, Hans, 1968- (1); Gudmundsson, Björn, ... (1); Hellier, David (1); Samur, Evren (1); Passenger, Josh (1); Spälter, Ulrich (1); Appleyard, Mark (1); Bleuler, Hannes (1); Orkisz, M. (1); Ahlstro?m, Ha?kan (1); Betancur, D. A. G. (1); Hoyos, M. H. (1); Lidayová, Kristína, ... (1); Frimmel, Hans, Docen ... (1); visa färre...

Lärosäte: Uppsala universitet (31); Kungliga Tekniska Högskolan (8); Linköpings universitet (5); Karolinska Institutet (3); Göteborgs universitet (2)

Språk: Engelska (32)

Forskningsämne (UKÄ/SCB): Teknik (32); Medicin och hälsovetenskap (13); Naturvetenskap (1)

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