Lasse Riis Østergaard

Associate Professor, PhD

  • Fredrik Bajers Vej 7, C1-212

    9220 Aalborg Ø

    Denmark

19962019
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Research Output 1997 2019

2019
6 Downloads (Pure)

Assessment of prostate cancer prognostic Gleason grade group using zonal-specific features extracted from biparametric MRI using a KNN classifier

Jensen, C., Carl, J., Boesen, L., Langkilde, N. C. & Østergaard, L. R., Feb 2019, In : Journal of Applied Clinical Medical Physics. 20, 2, p. 146–153 8 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
classifiers
Magnetic resonance imaging
lesions
Area Under Curve
grade

DeepQSM - using deep learning to solve the dipole inversion for quantitative susceptibility mapping

Bollmann, S., Rasmussen, K. G. B., Kristensen, M., Blendal, R. G., Østergaard, L. R., Plocharski, M., O'Brien, K., Langkammer, C., Janke, A. & Barth, M., 29 Mar 2019, In : NeuroImage.

Research output: Contribution to journalJournal articleResearchpeer-review

Magnetic Resonance Imaging
Learning
Iron Overload
Myelin Sheath
Multiple Sclerosis
Oxycodone
Validation Studies
Constipation
Colon
Placebos
1 Citation (Scopus)

Prediction of Alzheimer’s disease in mild cognitive impairment using sulcal morphology and cortical thickness

Plocharski, M. & Østergaard, L. R., 2019, World Congress on Medical Physics and Biomedical Engineering, 3-8 June 2018, Prague, Czech Republic. Lhotska, L., Sukupova, L., Lacković, I. & Ibbott, G. S. (eds.). 1 ed. Springer, Vol. 68. p. 69-74 6 p. (IFMBE Proceedings, Vol. 68(1)).

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

Alzheimer Disease
Occipital Lobe
Entorhinal Cortex
Gyrus Cinguli
Frontal Lobe

Prostate zonal segmentation in 1.5T and 3T T2W MRI using a convolutional neural network

Jensen, C., Sørensen, K. S., Jørgensen, C. K., Nielsen, C. W., Høy, P. C., Langkilde, N-C. & Østergaard, L. R., Jan 2019, In : Journal of medical imaging (Bellingham, Wash.). 6, 1, 014501.

Research output: Contribution to journalJournal articleResearchpeer-review

Prostate
Prostatic Neoplasms
Magnetic Resonance Imaging
Datasets
Therapeutics
1 Citation (Scopus)

SHARQnet - Sophisticated harmonic artifact reduction in quantitative susceptibility mapping using a deep convolutional neural network

Bollmann, S., Kristensen, M. H., Larsen, M. S., Olsen, M. V., Pedersen, M. J., Østergaard, L. R., O'Brien, K., Langkammer, C., Fazlollahi, A. & Barth, M., 14 Feb 2019, In : Medical Physics.

Research output: Contribution to journalJournal articleResearchpeer-review

Artifacts
Social Adjustment
Iron Overload
Physics
Multiple Sclerosis

Sulcal and Cortical Features for Classification of Alzheimer’s Disease and Mild Cognitive Impairment

Plocharski, M., Østergaard, L. R. & The Alzheimer’s Disease Neuroimaging Initiative, 2019, SCIA 2019: Scandinavian Conference on Image Analysis. Springer, p. 427-438 12 p. (Lecture Notes in Computer Science, Vol. 11482).

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

2018

Accurate measurement of airway morphology on chest CT images

Nardelli, P., Lanng, M. B., Møller, C. B., Andersen, A-S. H., Jørgensen, A. S., Østergaard, L. R. & Estépar, R. S. J., 2018, Image Analysis for Moving Organ, Breast, and Thoracic Images: Third International Workshop, RAMBO 2018, Fourth International Workshop, BIA 2018, and First International Workshop, TIA 2018, Held in Conjunction with MICCAI 2018, Granada, Spain, September 16 and 20, 2018, Proceedings. Springer, p. 335-347 (Lecture Notes in Computer Science, Vol. 11040).

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

A novel algorithm for detection of Eustachian tube openings in continuous direct middle ear pressure recordings with intact tympanic membrane under daily conditions

Larsen, M. S., Nielsen, F. S., Padurariu, S., Østergaard, L. R., Dirckx, J., Jacobsen, H. & Gaihede, M., 2018, Program and Abstracts, The 8th International Symposium on Middle-Ear Mechanics in Research and Otology, MEMRO2018, 5-9 July 2018, Shanghai, China. p. 26-27 S01-1

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

94 Downloads (Pure)

Automatic emphysema detection using weakly labeled HRCT lung images

Pino Peña, I., Cheplygina, V., Paschaloudi, S., Vuust, M., Carl, J., Weinreich, U. M., Østergaard, L. R. & de Bruijne, M., 2018, In : PLOS ONE. 13, 10, p. 1-16 16 p., e0205397.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
Emphysema
computed tomography
Tomography
Classifiers
lungs

Building a high-resolution in vivo minimum deformation average model of the human hippocampus

Jacobsen, N., Munk, J. B., Plocharski, M., Østergaard, L. R., Marstaller, L., Reutens, D., Barth, M., Janke, A. L. & Bollmann, S., 2018, 15 p. (bioRxiv).

Research output: Working paperResearch

5 Citations (Scopus)
93 Downloads (Pure)

Cervical flexion and extension includes anti-directional cervical joint motion in healthy adults

Wang, X., Lindstroem, R., Plocharski, M., Østergaard, L. R. & Graven-Nielsen, T., 2018, In : Spine Journal. 18, 1, p. 147-154

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
Joints
Articular Range of Motion
Healthy Volunteers
Fluoroscopy
Observational Studies

DeepQSM: Using deep learning to solve the dipole inversion for MRI susceptibility mapping

Rasmussen, K. G. B., Kristensen, M., Blendal, R. G., Østergaard, L. R., Plocharski, M., O'Brien, K., Langkammer, C., Janke, A., Barth, M. & Bollmann, S., 7 Mar 2018, 9 p. (bioRxiv).

Research output: Working paperResearch

DeepQSM: Solving the quantitative susceptibility mapping inverse problem using deep learning

Kristensen, M. J., Rasmussen, K. G. B., Blendal, R. G., Østergaard, L. R., Plocharski, M., Janke, A., Langkammer, C., O'Brien, K., Barth, M. & Bollmann, S., 2018, Proceedings of the International Society for Magnetic Resonance in Medicine, ISMRM, 16-21 June 2018, Paris, France. 2198

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

Open Access

Exploiting multiple color representations to improve colon cancer detection in whole slide H&E stains

Jørgensen, A. S., Emborg, J., Røge, R. & Østergaard, L. R., 2018, Computational Pathology and Ophthalmic Medical Image Analysis: First International Workshop, COMPAY 2018, and 5th International Workshop, OMIA 2018, Held in Conjunction with MICCAI 2018, Granada, Spain, 16-20 September 2018, Proceedings. Springer, p. 61-68 (Lecture Notes in Computer Science, Vol. 11039).

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

Frequency of eustachian tube openings based on long-term direct monitoring of middle ear pressure

Nielsen, F. S., Larsen, M. S., Padurariu, S., Østergaard, L. R., Jacobsen, H., Dirkcx, J. & Gaihede, M., 2018.

Research output: Contribution to conference without publisher/journalConference abstract for conferenceResearchpeer-review

3 Citations (Scopus)

Motion analysis of the cervical spine during extension and flexion: Reliability of the vertebral marking procedure

Plocharski, M., Lindstroem, R., Lindstroem, C. F. & Østergaard, L. R., Nov 2018, In : Medical Engineering & Physics. 61, p. 81-86 6 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Spine
Research Personnel
Articular Range of Motion
Radiography
X-Rays

MRI of the colon: An analysis of fecal volume and stool dryness

Mark, E. B., Bodker, M. B., Gronlund, D., Wegeberg, A-M. L., Ostergaard, L. R., Frokjaer, J. B. & Drewes, A. M., 2018, In : Neurogastroenterology and Motility. 30, 1, SI, p. 45-46 2 p., 136.

Research output: Contribution to journalConference abstract in journalResearchpeer-review

1 Citation (Scopus)
38 Downloads (Pure)
Open Access
File
Fetal Development
Postpartum Period
Placenta
Pregnancy
Blood Vessels

Postpartum placental CT angiography in normal pregnancies and in those complicated by diabetes mellitus

Thunbo, M. Ø., Sinding, M., Bogaard, P. W., Korsager, A. S., Frøkjær, J. B., Østergaard, L. R., Petersen, A. C. & Sørensen, A., 2018. 1 p.

Research output: Contribution to conference without publisher/journalPosterResearchpeer-review

Postpartum placental CT angiography in normal pregnancies and in those complicated by diabetes mellitus

Thunbo, M. Ø., Sinding, M., Bogaard, P., Korsager, A. S., Frøkjær, J. B., Østergaard, L. R., Petersen, A. & Sørensen, A., 2018, In : Placenta. 69, p. 20-25 6 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Postpartum Period
Diabetes Mellitus
Pregnancy
Blood Vessels
Birth Weight
Cell Nucleus
Coloring Agents
Cell Proliferation
Staining and Labeling
Cell Line
4 Citations (Scopus)
68 Downloads (Pure)

Repeatability of Cervical Joint Flexion and Extension Within and Between Days

Wang, X., Lindstroem, R., Plocharski, M., Østergaard, L. R. & Graven-Nielsen, T., Jan 2018, In : Journal of Manipulative and Physiological Therapeutics. 41, 1, p. 10-18 9 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
Joints
Analysis of Variance
Fluoroscopy
Articular Range of Motion
Spine
2017

Computer aided detection of prostate cancer on biparametric MRI using a quadratic discriminant model

Jensen, C., Korsager, A. S., Boesen, L., Østergaard, L. R. & Carl, J., 2017, Image Analysis: 20th Scandinavian Conference, SCIA, 12-14 June 2017, Tromsø, Norway, Proceedings, Part I . Sharma, P. & Bianchi, F. M. (eds.). Springer, p. 161-171 (Lecture Notes in Computer Science; No. 10269).

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

Contrast matching of ultra-high resolution minimum deformation averaged MRI models to facilitate computation of a multi-modal model of the human brain

Munk, J. B., Jacobsen, N., Plocharski, M., Østergaard, L. R., Barth, M., Janke, A. L. & Bollmann, S., 2017, Proceedings of the International Society for Magnetic Resonance in Medicine, ISMRM, 25th Annual Meeting, 22-27 April 2017, Honolulu, HI, USA. 1352

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

CT angiography of the fetoplacental macrovasculature in normal pregnancies and in those complicated by fetal growth restriction

Thunbo, M. Ø., Sinding, M., Korsager, A. S., Østergaard, L. R., Petersen, A., Overgaard, C., Frøkjær, J. B. & Sørensen, A., 2017, In : Placenta. 57, p. 313-314 P2.68.

Research output: Contribution to journalConference abstract in journalResearchpeer-review

1 Citation (Scopus)

Semi-automatic method for intervertebral kinematics measurement in the cervical spine

Nøhr, A. K., Pilgaard, L. P., Hansen, B. D., Nedergaard, R., Haavik, H., Lindstrøm, R., Plocharski, M. & Østergaard, L. R., 2017, Image Analysis: 20th Scandinavian Conference, SCIA, 12-14 June 2017, Tromsø, Norway, Proceedings, Part II. Sharma, P. & Bianchi, F. M. (eds.). Springer, p. 302-313 (Lecture Notes in Computer Science; No. 10270).

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

Systems and methods for estimating cardiac strain and displacement using ultrasound

von Ramm, O., Kisslo, J., Moore, C., Andersen, M. V., Schmidt, S., Søgaard, P. & Østergaard, L. R., 2017, Patent No. WO/2017/223563, 28 Dec 2017

Research output: PatentResearch

Open Access
8 Citations (Scopus)

Using cell nuclei features to detect colon cancer tissue in hematoxylin and eosin stained slides

Jørgensen, A. S., Rasmussen, A. M., Andersen, N. K. M., Andersen, S. K., Emborg, J., Røge, R. & Østergaard, L. R., 2017, In : Cytometry. Part A. 91, 8, p. 785-793

Research output: Contribution to journalJournal articleResearchpeer-review

Hematoxylin
Eosine Yellowish-(YS)
Cell Nucleus
Colonic Neoplasms
Cell Nucleus Structures
2016

3D analysis of the fetoplacental vasculature in normal pregnancies using CT angiography

Poulsen, M. Ø., Sinding, M. M., Korsager, A. S., Østergaard, L. R., Peters, D., Frøkjær, J. B., Petersen, A. C., Overgaard, C. & Sørensen, A. N., 2016, In : Ultrasound in Obstetrics & Gynecology. 48, Suppl. 1, p. 144 1 p., OP28.05.

Research output: Contribution to journalConference abstract in journalResearchpeer-review

An improved algorithm for coronary bypass anastomosis segmentation in epicardial ultrasound sequences

Jørgensen, A. S., Schmidt, S. E., Staalsen, N-H. & Østergaard, L. R., 2016, In : Ultrasound in Medicine & Biology. 42, 12, p. 3010-3021

Research output: Contribution to journalJournal articleResearchpeer-review

bypasses
vessels
Coronary Artery Bypass
Quality Control
Swine
10 Citations (Scopus)
102 Downloads (Pure)

Comparison of manual and automatic MR-CT registration for radiotherapy of prostate cancer

Korsager, A. S., Carl, J. & Østergaard, L. R., 2016, In : Journal of Applied Clinical Medical Physics. 17, 3, p. 294-303

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File

CT angiography of the fetoplacental vasculature in fetal growth restriction

Poulsen, M. Ø., Sinding, M. M., Peters, D., Frøkjær, J. B., Østergaard, L. R., Petersen, A. C., Overgaard, C. & Sørensen, A. N., 2016, Kongres for Medicinsk Studenterforskning, 17.-20. marts 2016, Nyborg, Danmark. Selskab for Medicinsk Studenterforskning, p. 67-68 No. p.5-8

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

Open Access
7 Citations (Scopus)

Extraction of sulcal medial surface and classification of Alzheimer's disease using sulcal features

Plocharski, M. & Østergaard, L. R., 2016, In : Computer Methods and Programs in Biomedicine. 133, p. 35-44

Research output: Contribution to journalJournal articleResearchpeer-review

5 Citations (Scopus)

High-frame-rate deformation imaging in two dimensions using continuous speckle-feature tracking

Andersen, M. V., Moore, C., Arges, K., Søgaard, P., Østergaard, L. R., Schmidt, S. E., Kisslo, J. & Von Ramm, O. T., 2016, In : Ultrasound in Medicine & Biology. 42, 11, p. 2606-2615

Research output: Contribution to journalJournal articleResearchpeer-review

Heart Ventricles
curves
chambers
sampling
cycles
2015
4 Citations (Scopus)

A new method to validate thoracic CT-CT deformable image registration using auto-segmented 3D anatomical landmarks

Nielsen, M. S., Østergaard, L. R. & Carl, J., 2015, In : Acta Oncologica. 54, 9, p. 1515-20 6 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Thorax
Tomography
Lung
Validation Studies
Lymphoma

A novel mri-based method to assess human colon volume in experimental opioid-induced bowel dysfunction

Nilsson, M., Sandberg, T. H., Poulsen, J. L., Gram, M., Frøkjær, J. B., Østergaard, L. R. & Drewes, A., 2015, In : Gut. 64, Suppl. 1, p. A318-319 PWE-242.

Research output: Contribution to journalConference abstract in journalResearchpeer-review

Open Access
21 Citations (Scopus)

A novel semi-automatic segmentation method for volumetric assessment of the colon based on magnetic resonance imaging

Sandberg, T. H., Nilsson, M., Poulsen, J. L., Gram, M., Frøkjær, J. B., Østergaard, L. R. & Drewes, A. M., 2015, In : Abdominal Imaging. 40, 7, p. 2232-2241 10 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Colon
Magnetic Resonance Imaging
Feces
Healthy Volunteers
Ascending Colon

A Novel Semi-automatic Segmentation Method for Volumetric Assessment of the Colon based on Magnetic Resonance Imaging

Poulsen, J. L., Sandberg, T. H., Nilsson, M., Gram, M., Frøkjær, J. B., Østergaard, L. R. & Drewes, A., 2015, Danish Society for Gastroenterology and Hepatology: 4. årsmøde. DSGH Dansk Selskab for Gastroenterologi og Hepatologi, p. 52 56

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

A Novel Semi-automatic Segmentation Method for Volumetric Assessment of the Colon based on Magnetic Resonance Imaging

Poulsen, J. L., Sandberg, T. H., Nilsson, M., Gram, M., Frøkjær, J. B., Østergaard, L. R. & Drewes, A., 2015, In : Neurogastroenterology and Motility. 27, Suppl. 2, p. 93

Research output: Contribution to journalConference abstract in journalResearchpeer-review

Open Access

Automatic coronary artery bypass anastomosis segmentation in epicardial ultrasound

Jørgensen, A. S., Schmidt, S., Staalsen, N-H. & Østergaard, L. R., 2015, In : International Journal of Computer Assisted Radiology and Surgery. 10, Suppl. 1, p. S18-S19

Research output: Contribution to journalConference abstract in journalResearchpeer-review

1 Citation (Scopus)

Automatic detection of coronary artery anastomoses in epicardial ultrasound images

Jørgensen, A. S., Schmidt, S. E., Staalsen, N-H. & Østergaard, L. R., 2015, In : International Journal of Computer Assisted Radiology and Surgery. 10, 8, p. 1313-1323

Research output: Contribution to journalJournal articleResearchpeer-review

5 Citations (Scopus)

Classification of Alzheimer's disease from MRI using sulcal morphology

Andersen, S. K., Jakobsen, C. E., Pedersen, C. H., Rasmussen, A. M., Plocharski, M. & Østergaard, L. R., 2015, Image Analysis: 19th Scandinavian Conference, SCIA 2015, Copenhagen, Denmark, June 15-17, 2015. Proceedings. Paulsen, R. R. & Pedersen, K. S. (eds.). Springer, p. 103-113 (Lecture Notes in Computer Science; No. 9127).

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

13 Citations (Scopus)

Quantification and variability in colonic volume with a novel magnetic resonance imaging method

Nilsson, M., Sandberg, T. H., Poulsen, J. L., Gram, M., Frøkjær, J. B., Østergaard, L. R., Krogh, K., Brock, C. & Drewes, A., 2015, In : Neurogastroenterology and Motility. 27, 12, p. 1755-1763

Research output: Contribution to journalJournal articleResearchpeer-review

348 Downloads (Pure)

Quantitative high-resolution CT analysis of air trapping and airway thickening in patients with COPD

Pena, I. P., Vust, M., Nielsen, H. M., Weinreich, U. M., Hansen, J. C. & Østergaard, L. R., 2015, In : Jacobs Journal of Pulmonology. 1, 2, 7 p., 010.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
15 Citations (Scopus)

The use of atlas registration and graph cuts for prostate segmentation in magnetic resonance images

Korsager, A. S., Fortunati, V., van der Lijn, F., Carl, J., Niessen, W., Østergaard, L. R. & van Walsum, T., 2015, In : Medical Physics. 42, 4, p. 1614-1624

Research output: Contribution to journalJournal articleResearchpeer-review

2014

A new validation method of thoracic CT to CT deformable image registration

Nielsen, M. S., Østergaard, L. R., Nyström, P. M. & Hansen, J. C., 2014, In : Radiotherapy & Oncology. 111, Suppl. 1, p. 668, No. EP-1701

Research output: Contribution to journalConference abstract in journalResearchpeer-review

System for detecting blood vessel structures in medical images

Jørgensen, A. S., Østergaard, L. R., Schmidt, S. & Staalsen, N-H., 2014, IPC No. G06T7/00, Patent No. WO2014037013, 13 Mar 2014, Priority date 7 Sep 2012

Research output: PatentResearch

Open Access

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