Thorarin A. Bjarnason

Radio frequency coil failure assessment through characterization of coil noise

Krystyna Mylostna, Seger Nelson, Islam I. Osman, Mohamed Shehata et autres

Motivation: Clinical imaging which occurs between coil failure and quality assurance detection of coil failure can be costly and detrimental to patient care. Efficient, automated quality assurance has the potential to reduce rescans and improve imaging reliability. Goal(s): Explore noise characteristics in …

Towards Real-Time RF Coil Failure Recognition Using Deep Transfer Learning

Seger Nelson, Krystyna Mylostna, Anubhav Gupta, Islam I. Osman et autres

Motivation: RF coil failures are often not visually recognizable. Quality control is only done weekly or monthly, leading to days to weeks where diagnostic images may be negatively impacted. Goal(s): Identify RF coil failures on patient images using deep transfer learning. Approach: …

Automating CT Diagnostic Image Quality Control Using Transfer Learning

Anubhav Gupta, Mohamed Shehata, Willard John Braun, Rebecca Emily Feldman et autres

Healthcare outcomes are intrinsically tied to the quality of medical imaging, which, in turn, relies on the precision of devices such as Computed Tomography (CT) scanners. Ensuring the high quality of medical images necessitates routine manual quality control testing, a process known …

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Reassessing lead protective garment assessment using ICRP 103 tissue weighting factors

Joan M Brewer, Kevin Hammerstrom, Thorarin A. Bjarnason

Abstract Lead protective garments worn by medical staff in the presence of x-rays develop defects over time. This work proposes a novel method of assessing the protective efficacy of the garments as defects develop. The proposed method applies updated radiobiology data from …

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Discontinuing Gonadal and Fetal Shielding in X-Ray

Yogesh Thakur, Stephanie C. Schofield, Thorarin A. Bjarnason, Michael N. Patlas

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COMP Report: A survey of radiation safety regulations for medical imaging x‐ray equipment in Canada

Thorarin A. Bjarnason, R S Rees, Judy Kainz, Lawrence H. Le et autres

OBJECTIVES: Rigid image registration (RIR) and deformable image registration (DIR) are widely used in radiotherapy. This project aims to capture current international approaches to image registration. METHODS: A survey was designed to identify variations in use, resources, implementation, and decision-making criteria for …

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Cascaded systems analysis of anatomic noise in digital mammography and dual-energy digital mammography

Jesse Tanguay, Robert G. Lalonde, Thorarin A. Bjarnason, Chang‐Ying Joseph Yang

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 was to validate by simulation and experiment a mathematical framework for modelling the Fg component …

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A Novel Method to Visualize Quantitative T2 MRI Data: qT2-View

Tonima Ali, Thorarin A. Bjarnason, Mark Simpson, Joseph Ross Mitchell

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LETTER TO THE EDITOR: THE ABSORPTION PROPERTIES OF LEAD-FREE GARMENTS FOR USE IN RADIATION PROTECTION

Thorarin A. Bjarnason

Dear Editor, Çetin et al.'s paper(1) on the absorption properties of Pb-free garments is missing some important context. They state that Sample 4 materials assessed ‘were lighter than a 0.5 mm lead garment and provided superior radiation protection’, which is arguably not …

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Characterization of brain tumours with spin–spin relaxation: pilot case study reveals unique T 2 distribution profiles of glioblastoma, oligodendroglioma and meningioma

Cornelia Laule, Thorarin A. Bjarnason, Irene M. Vavasour, Anthony L. Traboulsee et autres

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Sci‐Fri AM: MRI and Diagnostic Imaging ‐ 02: Quality Improvement: Diagnostic Reference Levels for Interior Health CT exams – L‐Spine, Chest/Abdomen/pelvis, Abdomen/Pelvis, Head

Thorarin A. Bjarnason

Diagnostic Reference Levels are used to optimize patient dose and image quality in the clinical setting. It is assumed that the majority of exams are of diagnostic quality, or the radiologists would request protocol adjustments. By investigating the dose indicator distributions from …

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Radiation Dose Survey for Common Computed Tomography Exams: 2013 British Columbia Results

Yogesh Thakur, Thorarin A. Bjarnason, Patricia Ann Baxter, Mitch Griffith et autres

In 2013 Health Canada conducted a national survey of computed tomography (CT) radiation usage. We analysed contributions from all 7 public health authorities in the province of British Columbia, which covered scanner age, number of slices, and common adult protocols (≥ 19 …

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