Search Results - "Bjarnason, Thorarin A."

Myelin water measurement in the spinal cord by Minty, Evan P., Bjarnason, Thorarin A., Laule, Cornelia, MacKay, Alex L.

“…The desire to monitor the spatial–temporal characteristics of myelination in the spinal cord (SC), in the context of pathological change in demyelinating…”
Get full text

The functional microstructure of tendon collagen revealed by high-field MRI by Mountain, Kelsey M., Bjarnason, Thorarin A., Dunn, Jeff F., Matyas, John R.

“…T2 was used in this study to assess tendon microstructure. Two unloaded digital extensor tendons were bent such that their long axes were imaged throughout…”
Get full text

CT radiation profile width measurement using CR imaging plate raw data by Bjarnason, Thorarin A, Yang, Chang‐Ying Joseph

“…This technical note demonstrates computed tomography (CT) radiation profile measurement using computed radiography (CR) imaging plate raw data showing it is…”
Get full text

Radiation Dose Survey for Common Computed Tomography Exams: 2013 British Columbia Results by Thakur, Yogesh, PhD, MCCPM, Bjarnason, Thorarin A., PhD, MCCPM, Baxter, Patricia, MSc, Griffith, Mitch, RTNM, Eaton, Kirk, MPA

“…Abstract In 2013 Health Canada conducted a national survey of computed tomography (CT) radiation usage. We analysed contributions from all 7 public health…”
Get full text

LETTER TO THE EDITOR: THE ABSORPTION PROPERTIES OF LEAD-FREE GARMENTS FOR USE IN RADIATION PROTECTION by Bjarnason, Thorarin A

Get full text

Cascaded systems analysis of anatomic noise in digital mammography and dual-energy digital mammography by Tanguay, Jesse, Lalonde, Robert, Bjarnason, Thorarin A, Yang, Chang-Ying Joseph

“…In x-ray based imaging of the breast, contrast between fibroglandular (Fg) tissue and adipose (Ad) tissue is a source of anatomic noise. The goal of this work…”
Get more information

Canadian Association of Radiologists Radiation Protection Working Group: Automated Patient-Specific Dose Registries—What Are They and What Are They Good for? by Bjarnason, Thorarin A., PhD, MCCPM, Thakur, Yogesh, PhD, MCCPM, Chakraborty, Santanu, MD, Liu, Peter, MD, O’Malley, Martin E., MD, Coulden, Richard, MD, Noga, Michelle, MD, Mason, Andrew, MD, Mayo, John, MD

“…Abstract Medical radiation should be used appropriately and with a dose as low as reasonably achievable. Dose monitoring technologies have been developed that…”
Get full text

Health Canada Safety Code 35: Awareness of the Impacts for Diagnostic Radiology in Canada by Bjarnason, Thorarin A., PhD, Thakur, Yogesh, PhD, Aldrich, John E., PhD, FCCPM

“…Abstract Health Canada Safety Code 35 brings Canada's diagnostic imaging radiation output and protection standards to an international level. This Safety Code…”
Get full text

Canadian Association of Radiologists Radiation Protection Working Group: Review of Radiation Units and the Use of Computed Tomography Dose Indicators in Canada by Thakur, Yogesh, PhD, Bjarnason, Thorarin A., PhD, Chakraborty, Santanu, MD, Liu, Peter, MD, O’Malley, Martin E., MD, Coulden, Richard, MD, Noga, Michelle, MD, Mason, Andrew, MD, Mayo, John, MD

Get full text

Discontinuing Gonadal and Fetal Shielding in X-Ray by Thakur, Yogesh, Schofield, Stephanie C., Bjarnason, Thorarin A., Patlas, Michael N.

Get full text

Pathological correlates of magnetic resonance imaging texture heterogeneity in multiple sclerosis by Zhang, Yunyan, Moore, G. R. Wayne, Laule, Cornelia, Bjarnason, Thorarin A., Kozlowski, Piotr, Traboulsee, Anthony, Li, David K. B.

“…Objective To analyze the texture of T2‐weighted magnetic resonance imaging (MRI) of postmortem multiple sclerosis (MS) brain, and to determine whether and how…”
Get full text

Multiexponential T2 and magnetization transfer MRI of demyelination and remyelination in murine spinal cord by McCreary, Cheryl R, Bjarnason, Thorarin A, Skihar, Viktor, Mitchell, J Ross, Yong, V Wee, Dunn, Jeff F

“…Identification of remyelination is important in the evaluation of potential treatments of demyelinating diseases such as multiple sclerosis. Local injection of…”
Get full text

Temporal phase correction of multiple echo T2 magnetic resonance images by Bjarnason, Thorarin A., Laule, Cornelia, Bluman, Joel, Kozlowski, Piotr

“…[Display omitted] •Temporal phase correction (TPC) was applied to human white matter T2 decay data.•Magnitude decay curves have Gaussian noise, a transition…”
Get full text

Insight into in vivo magnetization exchange in human white matter regions by Kalantari, Saeed, Laule, Cornelia, Bjarnason, Thorarin A., Vavasour, Irene M., MacKay, Alex L.

“…Water exchange can play an important role in interpreting compartment‐specific magnetic resonance imaging data in brain. For example, an MR method of myelin…”
Get full text

Characterization of brain tumours with spin-spin relaxation: pilot case study reveals unique T 2 distribution profiles of glioblastoma, oligodendroglioma and meningioma by Laule, Cornelia, Bjarnason, Thorarin A, Vavasour, Irene M, Traboulsee, Anthony L, Wayne Moore, G R, Li, David K B, MacKay, Alex L

“…Prolonged spin-spin relaxation times in tumour tissue have been observed since some of the earliest nuclear magnetic resonance investigations of the brain…”
Get full text

AnalyzeNNLS: Magnetic resonance multiexponential decay image analysis by Bjarnason, Thorarin A., Mitchell, J. Ross

“…Exponential decays are fundamental to magnetic resonance imaging, yet adequately sampling and analyzing multiexponential decays is rarely attempted. The…”
Get full text

Quantitative T2 analysis: The effects of noise, regularization, and multivoxel approaches by Bjarnason, Thorarin A., McCreary, Cheryl R., Dunn, Jeff F., Mitchell, J. Ross

“…Typical quantitative T2 (qT2) analysis involves creating T2 distributions using a regularized algorithm from region‐of‐interest averaged decay data. This study…”
Get full text

COMP Report: A survey of radiation safety regulations for medical imaging x‐ray equipment in Canada by Bjarnason, Thorarin A., Rees, Robert, Kainz, Judy, Le, Lawrence H., Stewart, Errol E., Preston, Brent, Elbakri, Idris, Fife, Ingvar A. J., Lee, Ting‐Yim, Gagnon, I Martin Benoît, Arsenault, Clément, Therrien, Pierre, Kendall, Edward, Tonkopi, Elena, Cottreau, Michelle, Aldrich, John E.

“…X‐ray regulations and room design methodology vary widely across Canada. The Canadian Organization of Medical Physicists (COMP) conducted a survey in 2016/2017…”
Get full text

Assessment of Patient Doses in CR Examinations Throughout a Large Health Region by Thakur, Yogesh, Bjarnason, Thorarin A., Hammerstrom, Kevin, Marchinkow, Lorie, Koch, Tim, Aldrich, John E.

“…Optimization and standardization of radiographic procedures in a health region minimizes patient exposure while producing diagnostic images. This report…”
Get full text

Digital to-do: Paperless literature review by Bjarnason, T. A.

“…Digital documents provide too many benefits to turn back now. With hand-held devices becoming more powerful all the time, literature reviews of the future will…”
Get full text