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

Filter
Journal article
2019
16 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., Jul 2019, In : NeuroImage. 195, p. 373-383 11 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Magnetic Resonance Imaging
Learning
Iron Overload
Myelin Sheath
Multiple Sclerosis

MRI analysis of fecal volume and dryness: Validation study using an experimental oxycodone-induced constipation model

Mark, E. B., Bødker, M. B., Grønlund, D., Østergaard, L. R., Frøkjaer, J. B. & Drewes, A. M., Sep 2019, In : Journal of Magnetic Resonance Imaging. 50, 3, p. 733-745 13 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Oxycodone
Validation Studies
Constipation
Colon
Placebos
9 Downloads (Pure)

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, 8 p., 014501.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
Prostate
Prostatic Neoplasms
Magnetic Resonance Imaging
Datasets
Therapeutics
Cell Nucleus
Coloring Agents
Cell Proliferation
Staining and Labeling
Cell Line
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., 1 May 2019, In : Medical Physics. 29, 2, p. 139-149 11 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Artifacts
Social Adjustment
Iron Overload
Physics
Multiple Sclerosis
2018
130 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
5 Citations (Scopus)
136 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
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
1 Citation (Scopus)
70 Downloads (Pure)
Open Access
File
Fetal Development
Postpartum Period
Placenta
Pregnancy
Blood Vessels
1 Citation (Scopus)
19 Downloads (Pure)

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

Open Access
File
Postpartum Period
Diabetes Mellitus
Pregnancy
Blood Vessels
Birth Weight
4 Citations (Scopus)
104 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
11 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

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)
120 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
9 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
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
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

14 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

361 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
16 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

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

2012
192 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

2009
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

2004
6 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