Thorarin Bjarnason

Ph.D. Candidate, Biomedical Engineering,
University of Calgary

MASc. Engineering Physics (2005), University of British Columbia
BEng. Engineering Physics (2002), University of Saskatchewan

Health Research Innovation Center
Floor 2, Room 2A07
3280 Hospital Drive NW
Calgary, AB  T2N 4N

Papers

  • Bjarnason TA, McCreary CR, Dunn, JF, Mitchell JR. Quantitative T2 Analysis: The effects of noise, regularization, and multi-voxel approaches. Magnetic Resonance in Medicine, 63(1); 212-7 (2010). doi:10.1002/mrm.22173
  • Bjarnason TA. Manuscript revisions, the Web 2.0 way. IEEE-Potentials, 28(4); 21-4 (2009). doi:10.1109/MPOT.2009.932503
  • Minty EP, Bjarnason TA, Laule C, MacKay AL. Myelin water measurement in spinal cord. Magnetic Resonance in Medicine, 61(4); 883-92 (2009). PMID: 19191283, doi:10.1002/mrm.21936
  • McCreary CR, Bjarnason TA, Skihar V, Mitchell JR, Yong VW, Dunn JF. Multiexponential T2 and magnetization transfer MRI of demyelination and remyelination in murine spinal cord. NeuroImage, 45(4); 1173-82 (2009). PMID: 19349232, doi: 10.1016/j.neuroimage.2008.12.071
  • Laule C, Kolind SH, Bjarnason TA, Li DKB, MacKay AL. In vivo multiecho T2 relaxation using variable TR to decrease scan time. Magnatic Resonance Imaging, 25(6); 834-9 (2007). PMID: 17482413, doi: 10.1016/j.mri.2007.02.016
  • MacKay A, Laule C, Vavasour I, Bjarnason T, Kolind S, Mädler B. Insights into brain microstructure from the T2 distribution. Magnetic Resonance Imaging, 24(4); 515-25 (2006). PMID: 16677958, doi: 10.1016/j.mri.2005.12.037
  • Bjarnason TA, Vavasour IM, Chia CLL, MacKay AL. Characterization of the NMR behavior of white matter in bovine brain. Magnetic Resonance in Medicine, 54(5); 1072-81 (2005). PMID: 16200557, doi: 10.1002/mrm.20680

Book Chapter

  • Bjarnason TA, Drabycz S, Adler DH, Cairncross JG, Mitchell JR, “Applying the S-Transform to Magnetic Resonance Imaging Texture Analysis”, in the Fields Institute Communications Series, Pseudo-Differential Operators: PDEs and Time-Frequency Analysis, Rodino L, Schulze BW, Wong MW (eds.); 311-22, 2007. ISBN-13: 978-0-8218-4276-8

Software

  • AnalyzeNNLS. Used to analyze multi-exponential decaying image data. html pdf

Abstracts/Conference Papers/Articles

  • Ali T, Bjarnason TA, Simpson M, Mitchell JR. A novel method to visualize quantitative T2 MRI data: qT2-View. Int J CARS, 4 (Suppl 1); S352-3 (2009).
  • Bjarnason TA, Laule C, Leung E, Mitchell JR, Kozlowski P, MacKay AL, Moore GW. T2 distribution reflects multiple sclerosis pathologies: Histology driven regions of interest. Proceedings of the International Society for Magnetic Resonance in Medicine; Honolulu, USA, 17; 3212 (2009). pdf
  • Bjarnason TA, McCreary CR, Dunn JF, Mitchell JR. Non-regularized multivoxel NNLS is a robust analysis approach to quantitative T2. Proceedings of the International Society for Magnetic Resonance in Medicine; Honolulu, USA, 17; 2742 (2009). pdf poster
  • McCreary CR, Bjarnason TA, Mitchell JR, Dunn JF. Multiexponential T2 analysis of rat brain and spinal cord. Proceedings of the International Society for Magnetic Resonance in Medicine; Honolulu, USA, 17; 1300 (2009).
  • Kalantari S, Laule C, Bjarnason TA, MacKay AL. In-vivo insights into magnetization exchange in human white matter structures. Proceedings of the International Society for Magnetic Resonance in Medicine; Honolulu, USA, 17; 1158 (2009).
  • Ali T, Bjarnason TA, Simpson M, Mitchell JR. A novel approach to quantitative T2 Visualizatoin: qT2-View. Proceedings of the Canadian Student Conference on Biomedical Computing; Vancouver, Canada, 4; 19 (2009). Best Poster Award.
  • Bjarnason TA. From digital to paper? How Canada’s proposed Bill C-61 will affect literature review. IEEE-Gold Rush Newsletter, September (2008). pdf
  • Bjarnason TA, McCreary CR, Dunn JF, Mitchell JR. A robust approach to quantitative T2 analysis. Proceedings of the International Workshop on Pathogenesis and Mechanisms of White Matter Injury; Krakow, Poland, P52 (2008).
  • McCreary CR, Bjarnason TA, Skihar V, Mitchell JR, Yong VW, Dunn JF. Quantitative MRI of lysolecithin lesions in the mouse spinal cord. Proceedings of the International Workshop on Pathogenesis and Mechanisms of White Matter Injury; Krakow, Poland, P20 (2008).
  • Bjarnason TA, Mitchell JR. AnalyzeNNLS: software designed to simplify multiexponential decay image analysis. Proceedings of the International Society for Magnetic Resonance in Medicine; Toronto, Canada, 16; 3047 (2008). pdf
  • McCreary CR, Bjarnason TA, Skihar V, Mitchell JR, Yong VW, Dunn JF. Evaluation of demyelination and remyelination in mouse spinal cord using multiexponential T2 and magnetization transfer ratio. Proceedings of the International Society for Magnetic Resonance in Medicine; Toronto, Canada, 16; 2106 (2008). Poster competition award – 1st place.
  • Bjarnason TA, McCreary CR, Dunn JF, Mitchell JR. Rician noise and the T2 distribution: Fitting complex decays. Proceedings of the International Society for Magnetic Resonance in Medicine; Berlin, Germany, 15; 528 (2007). pdf
  • Dunn JF, Kelly DA, McCreary C, Bjarnason TA, Zhao Z, Mitchell JR. Quantification of multicomponent T2 in brain after reversible ischemia. Proceedings of the International Society for Magnetic Resonance in Medicine; Berlin, Germany, 15; 2390 (2007).
  • Bjarnason TA, Drabycz S, Mitchell JR. Reduced memory requirements for the S-transform. Proceedings of the 20th Canadian Conference on Electrical and Computer Engineering (CCECE). Vancouver, Can, 20; 275-7 (2007). doi: 10.1109/CCECE.2007.191 pdf
  • Drabycz S, Bjarnason TA, Mitchell JR. A new method to collapse the S-transform into local spectra by integrating in squares. Proceedings of the 20th Canadian Conference on Electrical and Computer Engineering (CCECE). Vancouver, Can, 20; 271-4 (2007). doi: 10.1109/CCECE.2007.190 pdf
  • Bjarnason TA, MacKay AL. Describing magnetization transfer parameters in white matter using a four-pool model. Proceedings of the International Society for Magnetic Resonance in Medicine; Seattle, USA, 14; 2662 (2006). pdf poster
  • Bjarnason TA. Will piecewise continuous echo spacing adversely affect the T2 distribution? Proceedings of the International Society for Magnetic Resonance in Medicine; Seattle, USA, 14; 1501 (2006). pdf poster
  • Chia CL, Bjarnason TA, MacKay AL, Pike GB. Cross-site reproducibility of myelin water estimates. Proceedings of the International Society for Magnetic Resonance in Medicine; Seattle, USA, 14; 2520 (2006). pdf
  • Bjarnason TA, MacKay AL. Magnetization transfer parameters in white matter can be described using a four-pool model. Proceedings of the International Workshop on Myelin Imaging; Vancouver, Canada, P23 (2006).
  • Kolind SH, Laule C, Li DKB, Traboulsee AL, Bjarnason TA, Vavasour IM, MacKay AL. Myelin water fraction is not strongly correlated with diffusion measures in multiple sclerosis. Proceedings of the International Workshop on Myelin Imaging; Vancouver, Canada, P40 (2006).
  • Kolind SH, Laule C, Bjarnason TA, Vavasour IM, Traboulsee AL, Li DK, MacKay AL. Correlation of diffusion measures with multicomponent T2-relaxation data in Multiple Sclerosis lesions and normal appearing white matter. Proceedings of the International Society for Magnetic Resonance in Medicine; Miami, USA, 13; 314 (2005) pdf
  • Bjarnason TA, Vavasour IM, Chia CLL, MacKay AL. Proton signal characterisation in white matter: a four pool model. Proceedings of the International Society for Magnetic Resonance in Medicine; Kyoto, Japan, 12; 2706 (2004). pdf

Talks/Podcasts

  • “T2 distribution reflects Multiple Sclerosis pathologies: Histology driven regions of interest.” Bjarnason TA, Laule C, Leung E, Mitchell JR, Kozlowski P, MacKay AL, Moore GRW. endMS Retreat, Canmore, Canada. December 7, 2009.
  • “Quantitative T2 MRI: T2 is more than just a shade of grey.” Bjarnason TA, Ali T, Simpson M, Laule C, Mitchell JR. FMRIB Seminar Series, Oxford, England, UK. October 26, 2009.
  • “Quantitative T2 MRI: T2 is more than just a shade of grey.” Bjarnason TA, Ali T, Simpson M, Laule C, Mitchell JR. CUBRIC Seminar Series, Cardiff, Wales, UK. October 12, 2009.
  •  “Quantitative T2 with Application in Brain Cancer – March 2009.” Bjarnason TA, Ali T, Simpson M Mitchell JR, Laule C. Clark Smith Centre Common Research Meeting, University of Calgary, March 2009. (Podcast)
  • “How to use AnalyzeNNLS – December 2008.” Bjarnason TA, Mitchell JR. (Podcast)
  • “Quantitative T2: Software, Workflow, Phase Correction – November 2008.” Bjarnason TA, Ali T, Simpson M, Mitchell JR. Advanced Imaging Seminar Series, University of Calgary, Calgary, AB. November 2008 (Podcast)
  • “Medical Imaging Informatics – Towards Virtual Biopsy – October 2008.” Bjarnason TA, Drabycz S, Simpson M, Zhang M, Ali T, Roberts M, Mitchell JR. Welcome to SACRI students seminar, University of Calgary, Calgary AB, October 2008. (Podcast)
  • “Comparing Multiecho Analysis Workflows.” Bjarnason TA, McCreary CR, Dunn JF, Mitchell JR. Advanced Imaging Seminar Series, University of Calgary, Calgary, AB. February 2008. (Podcast)
  • “Quantitative T2 at the UofC.” Bjarnason TA, Mitchell JR. Apple Canada, Markham, ON, May 2008.
  • “Myelin Water Imaging and Histopathology.” Bjarnason TA, Laule C, Mitchell JR. Multiple Sclerosis Journal Club, University of Calgary, Calgary, AB. March 2007. (Podcast)
  • “Multiexponential Analysis: A Complex Approach.” Bjarnason TA. Advanced Imaging Seminar Series, University of Calgary, Calgary, AB. February 2007. (Podcast)
  • “Applications of time frequency analysis in medicine and geophysics.” Adler DH, Bjarnason TA, Drabycz S,Mitchell JRISAAC Workshop on Pseudo-Differential Operators: Partial Differential Equations and Time-Frequency Analysis, Toronto, ON. December 11-15, 2006. (Podcast)
  • “Why do multiexponential T2?” Bjarnason TA. MS Forum for Trainees and Mentors, Oregon Health & Science University, Santa Ana Pueblo, NM. September 10, 2005.
  • “Characterizing the NMR behaviour of bovine white matter: a four pool model approach.” Bjarnason TA. NMR Seminar Series, University of British Columbia, Vancouver, BC. September 2004.
  • “Magnetic resonance imaging: a brief introduction.” Bjarnason TA. Grades 11 and 12, Wynyard Composite High School, Wynyard, SK. December 2003.

          *Bold font indicates speaker.