Lasse Riis Østergaard

Associate Professor, PhD

  • Fredrik Bajers Vej 7, C1-212

    9220 Aalborg Ø

    Denmark

19962019
If you made any changes in Pure these will be visible here soon.

Research Output 1997 2019

2014

System for determining flow properties of a blood vessel

Schmidt, S., Østergaard, L. R., Staalsen, N-H., Lundhus, K. & Svorkmo, M., 2014, IPC No. G06T 7/00, Patent No. US20140064582, 6 Mar 2014, Priority date 8 Feb 2011

Research output: PatentResearch

2013
5 Citations (Scopus)

MR-CT registration using a Ni-Ti prostate stent in image-guided radiotherapy of prostate cancer

Korsager, A. S., Hansen, J. C. & Østergaard, L. R., 2013, In : Medical Physics. 40, 6, 8 p., 061907.

Research output: Contribution to journalJournal articleResearchpeer-review

4 Citations (Scopus)

The use of an active appearance model for automated prostate segmentation in magnetic resonance

Korsager, A. S., Stephansen, U. L., Hansen, J. C. & Østergaard, L. R., 2013, In : Acta Oncologica. 52, 7, p. 1374-1377

Research output: Contribution to journalJournal articleResearchpeer-review

1 Downloads (Pure)

Tracking of the flexion-extension movement of the cervical vertebrae using fluoroscopy

Nedergaard, R. W., Liu, H., Karczewski, P., Lindstrøm, R., Østergaard, L. R. & de Zee, M., 2013, ISB 2013, XXIV Congress of the International Society of Biomechanics, 4-9 August 2013, Natal, Brazil [CD-ROM]. International Society of Biomechanics, ISB, 2 p.

Research output: Contribution to book/anthology/report/conference proceedingConference abstract in proceedingResearchpeer-review

2012

A system for determining flow properties of a blood vessel

Schmidt, S., Østergaard, L. R., Staalsen, N-H., Lundhus, K. & Svorkmo, M., 2012, IPC No. G06T 7/00, Patent No. WO/2012/107050, 16 Aug 2012

Research output: PatentResearch

Automatic vessel tracking and segmentation using epicardial ultrasound in bypass surgery

Jørgensen, A. S., Schmidt, S., Staalsen, N-H. & Østergaard, L. R., 2012, Annual Computing in Cardiology Conference, CinC, 9-12 September 2012, Krakow, Poland. Krakow: AGH University of Science and Technology, p. 3

Research output: Contribution to book/anthology/report/conference proceedingConference abstract in proceedingResearchpeer-review

2 Citations (Scopus)

Automatic vessel tracking and segmentation using epicardial ultrasound in bypass surgery

Jørgensen, A. S., Schmidt, S., Staalsen, N-H. & Østergaard, L. R., 2012, In : Computing in Cardiology. 39, p. 9-12

Research output: Contribution to journalConference article in JournalResearchpeer-review

183 Citations (Scopus)

BEaST: brain extraction based on nonlocal segmentation technique

Eskildsen, S. F., Coupé, P., Fonov, V., Manjón, J. V., Leung, K. K., Guizard, N., Wassef, S. N., Østergaard, L. R. & Collins, D. L., 2012, In : NeuroImage. 59, 3, p. 2362-2373

Research output: Contribution to journalJournal articleResearchpeer-review

MR-CT registration in image-guided radiotherapy of prostate cancer using a Ni-Ti prostate stent

Korsager, A. S., Carl, J. & Østergaard, L. R., 2012, In : Radiotherapy & Oncology. 103, Suppl. 1, p. S535-S536, No. EP-1408

Research output: Contribution to journalConference abstract in journalResearchpeer-review

MR-CT registration in image-guided radiotherapy of prostate cancer using a Ni-Ti prostate stent

Korsager, A. S., Carl, J. & Østergaard, L. R., 2012.

Research output: Contribution to conference without publisher/journalPosterResearch

Quantitative quality assessment of coronary artery bypass graft surgery using ultrasound images

Jørgensen, A. S., Schmidt, S., Staalsen, N-H. & Østergaard, L. R., 2012.

Research output: Contribution to conference without publisher/journalPosterResearch

3 Citations (Scopus)

Semi-automatic vessel tracking and segmentation using epicardial ultrasound in bypass surgery

Jørgensen, A. S., Schmidt, S., Staalsen, N-H. & Østergaard, L. R., 2012, 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, IEEE EMBS, EMBC, 28 August-1 September 2012, San Diego, CA, USA. IEEE Press, p. 2331-2334 (IEEE Engineering in Medicine and Biology Society. Conference Proceedings).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

2011

Airway tree segmentation for optimal stent placement in image-guided radiotherapy

Stephansen, U. L., Horup, R. W., Gram, M., Olesen, J. T., Hansen, J. C., Korsager, A. S. & Østergaard, L. R., 2011, The Fourth International Workshop on Pulmonary Image Analysis, 18 September 2011, Toronto, Canada. Beichel, R., de Bruijne, M., van Ginneken, B., Kabus, S., Kiraly, A., Kuhnigk, J-M., McClelland, J., Mori, K., van Rikxoort, E. & Rit, S. (eds.). CreateSpace, p. 135-146

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

BEaST: brain extraction using multiresolution nonlocal segmentation

Eskildsen, S. F., Coupé, P., Leung, K. K., Fonov, V., Guizard, N., Wassef, S. N., Østergaard, L. R. & Collins, D. L., 2011, Proceedings of the 2011 MICCAI Workshop on Multi-Atlas Labeling and Statistical Fusion, 22 September 2011, Canada. Medical Image Analysis and Statistical Interpretation Lab, School of Engineering, Vanderbilt University, 12 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Effect of non-local means denoising on cortical segmentation accuracy with FACE

Eskildsen, S. F., Coupe, P., Fonov, V., Østergaard, L. R. & Collins, D. L., 2011, Abstracts, 17th Annual Meeting of the Organization on Human Brain Mapping, HBM 2011, 26-30 June 2011, Quebec City, Canada. p. No. 673

Research output: Contribution to book/anthology/report/conference proceedingConference abstract in proceedingResearchpeer-review

2 Citations (Scopus)

Prediction of Alzheimer’s disease in subjects with mild cognitive impairment using structural patterns of cortical thinning

Eskildsen, S. F., Fonov, V., Coupé, P., Østergaard, L. R. & Collins, D. L., 2011, In : International Federation for Medical and Biological Engineering Proceedings. 34, p. 156-159

Research output: Contribution to journalConference article in JournalResearchpeer-review

Prediction of MCI converters in the ADNI cohort using patterns of cortical thinning

Eskildsen, S. F., Fonov, V., Coupe, P., Østergaard, L. R. & Collins, L., 2011, In : Alzheimer's & Dementia. 7, 4, Suppl., p. S25, No. IC-P-042

Research output: Contribution to journalConference abstract in journalResearchpeer-review

Evaluation of gyrification index and fractal dimension as measures of lobar cortical complexity

Eskildsen, S. F., Steffensen, E., Järnum, H., Østergaard, L. R. & Larsson, E. M., 2010, Abstracts of the 16th Annual Meeting of the Organization for Human Brain Mapping, HBM 2010, 6-10 June 2010, Barcelona, Spain. p. No. 1386 WTh-PM

Research output: Contribution to book/anthology/report/conference proceedingConference abstract in proceedingResearchpeer-review

Partial volume correction using cortical surfaces

Blaasvær, K. R., Haubro, C. D., Eskildsen, S. F., Borghammer, P., Otzen, D. & Østergaard, L. R., 2010, In : Progress in Biomedical Optics and Imaging. 7623, p. 76234R 9 p.

Research output: Contribution to journalConference article in JournalResearchpeer-review

1 Citation (Scopus)

Rigid registration of 3D ultrasound and MRI: comparing two approaches on nine tumor cases

Mercier, L., Fonov, V., del Maestro, R. F., Petrecca, K., Østergaard, L. R. & Collins, D. L., 2010, Brain, Body and Machine: Proceedings of an International Symposium on the Occasion of the 25th Anniversary of the McGill University Centre for Intelligent Machines. Angeles, J., Boulet, B., Clark, J. J., Kövecses, J. & Siddigi, K. (eds.). Springer, Vol. 83. p. 33-43 (Advances in Intelligent and Soft Computing, Vol. 83).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

The use of a prostate stent for MR-CT registration in image-guided radiotherapy of prostate cancer

Østergaard, L. R., Eskildsen, S. F., Nielsen, J., Holmberg, A., Larsen, E. H., Fabrin, K., Fisker, R. & Carl, J., 2010, In : Radiotherapy & Oncology. 96, Suppl. 1, p. S 417-S 418, No. 1238

Research output: Contribution to journalConference abstract in journalResearchpeer-review

2009

Automatic hippocampal volumetry using active appearance models in patients with major depression and healthy controls

Hald, N., Eskildsen, S. F., Steffensen, E., Järnum, H., Østergaard, L. R. & Larsson, E. M., 2009, In : Magnetic Resonance Materials in Physics, Biology and Medicine. 22, Suppl. 1, p. 516, No. 723

Research output: Contribution to journalConference abstract in journalResearch

Cortical thickness in patients with major depression and healthy volunteers

Eskildsen, S. F., Järnum, H., Østergaard, L. R., Steffensen, E. & Larsson, E-M., 2009, Proceedings of the 17th Scientific Meeting & Exhibition of the International Society of Magnetic Resonance in Medicine, ISMRM, 18-24 April 2009, Honolulu, HI, USA [CD-ROM]. p. No. 1229

Research output: Contribution to book/anthology/report/conference proceedingConference abstract in proceedingResearch

18 Citations (Scopus)

Cortical volumes and atrophy rates in FTD-3 CHMP2B mutation carriers and related non-carriers

Eskildsen, S. F., Østergaard, L. R., Rodell, A., Østergaard, L., Nielsen, J. E., Isaacs, A. M. & Johannsen, P., 2009, In : NeuroImage. 45, 3, p. 713-721

Research output: Contribution to journalJournal articleResearchpeer-review

DNA-based Bayesian inference and analysis of bacterial antibiotic resistance

Hejlesen, O. K., Kæseler, N., Sanden, L. R., Østergaard, L. R. & Tsafnat, G., 2009, SHI2009 Proceedings: 7th Scandinavian Conference on Health Informatics, 24-26 August 2009, Arendal, Norway. Fensli, R. & Dale, J. G. (eds.). TAPIR Akademisk Forlag, p. 18-22

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

2008
9 Citations (Scopus)

Evaluation of five algorithms for mapping brain cortical surfaces

Eskildsen, S. F. & Østergaard, L. R., 2008, Proceedings of the 2008 XXI Brazilian Symposium on Computer Graphics and Image Processing. IEEE Computer Society Press, p. 137-144

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

2007

Analysis of vertex density in cortical surface extraction using MRI phantom

Eskildsen, S. F. & Østergaard, L. R., 2007, OHBM [the Organization for Human Brain Mapping] 13th Annual Meeting, 10-14 June 2007, Chicago, Illinois, USA [CD-ROM]. p. No 303 T-AM

Research output: Contribution to book/anthology/report/conference proceedingConference abstract in proceedingResearch

5 Citations (Scopus)

Early detection of AD using cortical thickness measurements

Spjuth, M., Gravesen, F. H., Eskildsen, S. F. & Østergaard, L. R., 2007, Medical Imaging 2007: Image Processing. SPIE - International Society for Optical Engineering, p. 65120L/1-65120L/9

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Numerical Dosimetry for the PET Study of the Cerebrometabolic Effects of Radiation from Cellphones

Franek, O., Pedersen, G. F., Andersen, J. B., Eskildsen, S. F., Østergaard, L. R., Møller, A. & Gjedde, A., 2007, Book of abstracts of EBEA 2007. EBEA, p. 107 1 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

7 Citations (Scopus)

Quantitative comparison of two cortical surface extraction methods using MRI phantoms

Eskildsen, S. F. & Østergaard, L. R., 2007, Medical Image Computing and Computer-Assisted Intervention, MICCAI 2007: 10th International Conference, 29 October-2 November 2007, Brisbane, Australia. Proceedings. Ayache, N., Ourselin, S. & Maeder, A. (eds.). IEEE Computer Society Press, Vol. 1. p. 409-416 (Lecture Notes in Computer Science; No. 4791).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

2006
25 Citations (Scopus)

Active surface approach for extraction of the human cerebral cortex from MRI

Eskildsen, S. F. & Østergaard, L. R., 2006, Medical Image Computing and Computer-Assisted Intervention, MICCAI 2006: 9th International Conference, 1-6 October 2006, Copenhagen, Denmark. Proceedings, Part II. Larsen, R., Nielsen, M. & Sporring, J. (eds.). IEEE Computer Society Press, Vol. 2. p. 823-830 (Lecture Notes in Computer Science; No. 4191).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

2005

Computerised cortex boundary extraction from MR images

Eskildsen, S. F., Uldahl, M., Østergaard, L. R. & Prisak, A., 2005, Patent No. WO/2005/111931 , 24 Nov 2005

Research output: PatentResearch

8 Citations (Scopus)

Extraction of the cerebral cortical boundaries from MRI for measurement of cortical thickness

Eskildsen, S. F., Uldahl, M. & Østergaard, L. R., 2005, Medical Imaging 2005: Image Processing. Fitzpatrick, J. M. & Reinhardt, J. M. (eds.). p. 1400-1410

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

In vivo analysis of disease progression in Alzheimer's disease

Uldahl, M., Eskildsen, S. F. & Østergaard, L. R., 2005, Image Analysis and in-vivo Pharmacology, IAVP, Final Programme, Book of Abstracts, 7-9 April 2005, Roskilde, Denmark. p. 17

Research output: Contribution to book/anthology/report/conference proceedingConference abstract in proceedingResearch

Method for computerised boundary extraction in images

Østergaard, L. R., Eskildsen, S. F., Prisak, A. & Uldahl, M., 2005, Patent No. WO2005DK00320, 13 May 2005

Research output: PatentResearch

2004

Automatic in vivo quantification of cortical atrophy

Eskildsen, S. F., Uldahl, M., Østergaard, L. R., Gyldensted, L., Rodell, A. & Østergaard, L., 2004, Neurodag 2004, Abstract Book, 5 November 2004, Copenhagen, Denmark. p. Poster 61

Research output: Contribution to book/anthology/report/conference proceedingConference abstract in proceedingResearch

5 Citations (Scopus)

Method for modelling cerebral blood vessels and their bifurcations using circular, homogeneous, generalised cylinders

Flaaris, J. J., Volden, M., Haase, J. & Østergaard, L. R., 2004, In : Medical & Biological Engineering & Computing. 42, 2, p. 171-177

Research output: Contribution to journalJournal articleResearchpeer-review

Når demens kan måles i millimeter

Eskildsen, S. F., Uldahl, M. & Østergaard, L. R., 2004, In : Aktuel Naturvidenskab. 2004, 2, p. 21-22

Research output: Contribution to journalJournal articleCommunication

2002

Simulating the puncture of the human ventricle

Cros, O., Volden, M., Flaaris, J. J., Brix, L. C., Pedersen, C. F., Hansen, K. V., Larsen, O. V., Østergaard, L. R. & Haase, J., 2002, Digital upgrades : applying Moore's Law to health.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearch

Surface modeling of blood vessels based on standard imaging modalities

Flaaris, J. J., Volden, M., Haase, J., Østergaard, L. R. & Larsen, O. V., 2002, In : Child's Nervous System. 18, 5, p. 249

Research output: Contribution to journalConference abstract in journalResearch

2001
4 Citations (Scopus)

Knowledge-based extraction of cerebral vasculature from anatomical MRI

Østergaard, L. R., Larsen, O. V., Haase, J., Meer, F. V., Evans, A. C. & Collins, D. L., 2001, Medical Imaging 2001 : Image Processing, 19-22 February 2001, San Diego, CA, USA. 27 ed. SPIE - International Society for Optical Engineering, Vol. 2. p. 170-183 (Progress in Biomedical Optics and Imaging; No. 27, Vol. 2). (Proceedings of SPIE; No. 4322, Vol. 1).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearch

Surface modeling of blood vessels based on 3D medical images

Baun, T., Flaaris, J. J., Volden, M., Haase, J., Larsen, O. V. & Østergaard, L. R., 2001, Proceedings of the International Federation for Medical & Biological Engineering, IFMBE, IX Mediterranean Conference on Medical and Biological Engineering and Computing, Medicon 2001, part 2, 12-15 June 2001, Pula, Croatia. Magjarevic, R., Tonkovic, S., Bilas, V. & Lackovic, I. (eds.). University of Zagreb, p. 969-973

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearch

30 Citations (Scopus)

The Virtual Brain Project: development of a neurosurgical simulator

Larsen, O. V., Haase, J., Østergaard, L. R., Hansen, K. V. & Nielsen, H., 2001, Medicine Meets Virtual Reality 2001, 24-27 January 2001, Newport Beach, CA, USA: Studies in Health Technology and Informatics. Westwood, J. D., Hoffman, H. M., Mogel, G. T., Stredney, D. & Robb, R. A. (eds.). 81 ed. IOS Press, p. 256-262

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearch

2000

3D modeling of the cerebral vasculature

Østergaard, L. R., Jensen, F. K. & Larsen, O. V., 2000, In : European Journal of Clinical Investigation. 30, Suppl. 1

Research output: Contribution to journalConference abstract in journalResearch

Extraction of cerebral vasculature from MRI

Østergaard, L. R., Larsen, O. V., Goualher, G. L., Evans, A. C. & Collins, D. L., 2000, 9th Danish Conference on Pattern Recognition and Image Analysis, August 2000, Aalborg, Denmark.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearch

1999

3D localisation from DSA images using the Leksell stereotactic frame

Lind, J., Østergaard, L. R., Larsen, O. V., Nielsen, H., Bartholdy, N. J. & Haase, J., 1999, Proceedings of the 11th Scandinavian Conference on Image Analysis, SCIA'99, 7-11 June 1999, Sdr. Strømfjord, Greenland. Vol. Vol. 2. p. 849-856

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearch

Three dimensional surface registration of stereo images and models for MR images

Nielsen, H., Østergaard, L. R. & Gall, D. L., 1999, Machine Vision and advanced Image Processing in Remote Sensing. Kanellopoulos, I. : Wilkonson, G.G. : Moons, T. (eds.) (ed.).

Research output: Contribution to book/anthology/report/conference proceedingBook chapterResearch

1998
4 Citations (Scopus)

Applying voting to segmentation of MR images

Østergaard, L. R. & Larsen, O. V., 1998, Advances in Pattern Recognition : Joint IAPR International Workshops SSPR'98 and SPR'98, August 1998, Sydney, Australia. p. 795-804

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearch

System for 3D localisation of malformations in the human brain

Lind, J., Østergaard, L. R., Larsen, O. V., Nielsen, H., Bartholdy, N. J. & Haase, J., 1998, Aalborg: Virtual Centre for Health Informatics, Aalborg University. (V-CHI Technical Report; No. 98-3).

Research output: Book/ReportReportResearch