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Articles 1 - 30 of 40
Full-Text Articles in Medicine and Health Sciences
Scan-Rescan And Intra-Observer Variability Of Magnetic Resonance Imaging Of Carotid Atherosclerosis At 1.5 T And 3.0 T, Arvin Vidal, Yves Bureau, Trevor Wade, J David Spence, Brian K Rutt, Aaron Fenster, Grace Parraga
Scan-Rescan And Intra-Observer Variability Of Magnetic Resonance Imaging Of Carotid Atherosclerosis At 1.5 T And 3.0 T, Arvin Vidal, Yves Bureau, Trevor Wade, J David Spence, Brian K Rutt, Aaron Fenster, Grace Parraga
Medical Biophysics Publications
Carotid atherosclerosis measurements for eight subjects at baseline and 14 +/- 2 days later were examined using 1.5 T and 3.0 T magnetic resonance imaging (MRI). A single observer blinded to field strength, subject and timepoint manually segmented carotid artery wall and lumen boundaries in randomized images in five measurement trials. Mean increases in the signal-to-noise ratios (SNR) for T1-weighted images acquired at 3.0 T compared to 1.5 T were 90% (scan) and 80% (rescan). Despite significantly improved SNR and contrast-to-noise ratios (CNR) for images acquired at 3.0 T, vessel wall volume (VWV) intra-observer variability was not significantly different using …
Consistency Check Of Planned Adaptive Option On Helical Tomotherapy., M Schirm, S Yartsev, G Bauman, Jerry J. Battista Dr., Jacob Van Dyk
Consistency Check Of Planned Adaptive Option On Helical Tomotherapy., M Schirm, S Yartsev, G Bauman, Jerry J. Battista Dr., Jacob Van Dyk
Oncology Publications
This study aims to evaluate a new Planned Adaptive software (TomoTherapy Inc., Madison, WI) of the helical tomotherapy system by retrospective verification and adaptive re-planning of radiation treatment. Four patients with different disease sites (brain, nasal cavity, lungs, prostate) were planned in duplicate using the diagnostic planning kVCT data set and MVCT studies of the first treatment fraction with the same optimization parameters for both plan types. The dosimetric characteristics of minimum, maximum, and mean dose to the targets as well as to organs at risk were compared. Both sets of plans were used for calculation of dose distributions in …
Genomic Rna Profiling And The Programme Controlling Preimplantation Mammalian Development., Christine E Bell, Michele D Calder, Andrew J Watson
Genomic Rna Profiling And The Programme Controlling Preimplantation Mammalian Development., Christine E Bell, Michele D Calder, Andrew J Watson
Obstetrics & Gynaecology Publications
Preimplantation development shifts from a maternal to embryonic programme rapidly after fertilization. Although the majority of oogenetic products are lost during the maternal to embryonic transition (MET), several do survive this interval to contribute directly to supporting preimplantation development. Embryonic genome activation (EGA) is characterized by the transient expression of several genes that are necessary for MET, and while EGA represents the first major wave of gene expression, a second mid-preimplantation wave of transcription that supports development to the blastocyst stage has been discovered. The application of genomic approaches has greatly assisted in the discovery of stage specific gene expression …
Referral In The Wake Of Conscientious Objection To Abortion, Carolyn Mcleod
Referral In The Wake Of Conscientious Objection To Abortion, Carolyn Mcleod
Philosophy Publications
Currently, the preferred accommodation for conscientious objection to abortion in medicine is to allow the objector to refuse to accede to the patient's request so long as the objector refers the patient to a physician who performs abortions. The referral part of this arrangement is controversial, however. Pro-life advocates claim that referrals make objectors complicit in the performance of acts that they, the objectors, find morally offensive. McLeod argues that the referral requirement is justifiable, although not in the way that people usually assume.
Interface Of Cannabis And Early Psychosis--Priorities In Research And Service Development, Amresh Srivastava
Interface Of Cannabis And Early Psychosis--Priorities In Research And Service Development, Amresh Srivastava
Psychiatry Presentations
Introduction: cannabis continues to affect mental health. Its abuse is on rise globally. In Canada a rise by 30% in last ten years has been observed in high school students. Interrelationship of cannabis with psychosis and schizophrenia is a complex one. Cannabis is highly comorbid with psychosis, & related to functional disability and outcome. It poses several challenges in understanding causal relationship for comorbidity, underlying neurochemical basis and specifics of service development. Prevalence of Cannabis varies from 20 to 50% early psychosis. Objective of this paper is to review available literature to identify challenges for newer targets of research and …
Cannabis & Psychosis: The Interface Emerging Frontiers For Research, Amresh Shrivastava
Cannabis & Psychosis: The Interface Emerging Frontiers For Research, Amresh Shrivastava
Psychiatry Presentations
INTRODUCTION: CANNABIS CONTINUES TO AFFECT MENTAL HEALTH. ITS ABUSE IS ON RISE GLOBALLY. IN CANADA A RISE BY 30% IN LAST TEN YEARS HAS BEEN OBSERVED IN HIGH SCHOOL STUDENTS. INTERRELATIONSHIP OF CANNABIS WITH PSYCHOSIS AND SCHIZOPHRENIA IS A COMPLEX ONE. CANNABIS IS HIGHLY COMORBID WITH PSYCHOSIS, & RELATED TO FUNCTIONAL DISABILITY AND OUTCOME. IT POSES SEVERAL CHALLENGES IN UNDERSTANDING CAUSAL RELATIONSHIP FOR COMORBIDITY, UNDERLYING NEUROCHEMICAL BASIS AND SPECIFICS OF SERVICE DEVELOPMENT. PREVALENCE OF CANNABIS VARIES FROM 20 TO 50% EARLY PSYCHOSIS. OBJECTIVE OF THIS PAPER IS TO REVIEW AVAILABLE LITERATURE TO IDENTIFY CHALLENGES FOR NEWER TARGETS OF RESEARCH AND …
Differential Characteristics Of “Good Outcome Schizophrenia” In A Long-Term Ten Years Study, Mumbai, India, Amresh Srivastava, Meghan Thakar, Nilesh Shah, Larry Stitt
Differential Characteristics Of “Good Outcome Schizophrenia” In A Long-Term Ten Years Study, Mumbai, India, Amresh Srivastava, Meghan Thakar, Nilesh Shah, Larry Stitt
Psychiatry Presentations
No abstract provided.
Coping With Clinical Challenges Of Risk Assessment: Towards A New Comprehensive Instrument, Amresh Srivastava, Charles Nelson
Coping With Clinical Challenges Of Risk Assessment: Towards A New Comprehensive Instrument, Amresh Srivastava, Charles Nelson
Psychiatry Presentations
No abstract provided.
Coping With Clinical Challenges Of Risk-Assessment, Amresh Srivastava
Coping With Clinical Challenges Of Risk-Assessment, Amresh Srivastava
Psychiatry Presentations
No abstract provided.
Outcome In Schizophrenia: The Long-Term Good Outcome In Schizophrenia Is Not Yet Good Enough, Amresh Srivastava, Meghan Thakar
Outcome In Schizophrenia: The Long-Term Good Outcome In Schizophrenia Is Not Yet Good Enough, Amresh Srivastava, Meghan Thakar
Psychiatry Presentations
The illness of schizophrenia has always been a matter of concern for its nature and extent of outcome particularly for its regional and cultural differences. The concept of outcome has been evolving and this study examines the scenario of good outcome in developing countries.
Outcome In Schizophrenia: How Good Is "Good Outcome" Schizophrenia In Long-Term In Developing Countries, Amresh Srivastava, Meghan Thakar, Nilesh Shah, Larry Stitt
Outcome In Schizophrenia: How Good Is "Good Outcome" Schizophrenia In Long-Term In Developing Countries, Amresh Srivastava, Meghan Thakar, Nilesh Shah, Larry Stitt
Psychiatry Presentations
No abstract provided.
Complexity And Limitations Of Stress-Endocrine Research In Mental Health, Amresh Srivastava
Complexity And Limitations Of Stress-Endocrine Research In Mental Health, Amresh Srivastava
Psychiatry Presentations
No abstract provided.
Posttraumatic Stress Disorder And Health-Related Quality Of Life Among A Sample Of Treatment- And Pension-Seeking Deployed Canadian Forces Peacekeeping Veterans, Don Richardson, Mary E. Long, David J. Pedlar, Jon D Elhai
Posttraumatic Stress Disorder And Health-Related Quality Of Life Among A Sample Of Treatment- And Pension-Seeking Deployed Canadian Forces Peacekeeping Veterans, Don Richardson, Mary E. Long, David J. Pedlar, Jon D Elhai
MacDonald Franklin OSI Research Centre
Objectives: To examine the health-related quality of life (HRQOL) in deployed Canadian Forces peacekeeping veterans, addressing associations with posttraumatic stress disorder (PTSD), and depression severity. Methods: Participants (n = 125) were consecutive male veterans who were referred for a psychiatric assessment. Instruments administered included the Clinician-Administered PTSD Scale, Hamilton Depression Scale, Short-Form-36 Health Survey, and sociodemographic characteristics. Results: Mental HRQOL was significantly lower for peacekeepers with, than without, PTSD. Using univariate analyses, PTSD and depression severity were each significantly negatively related to mental HRQOL. In sequential regression analyses controlling for age, we found that PTSD and depression severity significantly predicted …
Posttraumatic Stress Disorder And Health-Related Quality Of Life Among A Sample Of Treatment- And Pension-Seeking Deployed Canadian Forces Peacekeeping Veterans, Don Richardson, Mary E. Long, David J. Pedlar
Posttraumatic Stress Disorder And Health-Related Quality Of Life Among A Sample Of Treatment- And Pension-Seeking Deployed Canadian Forces Peacekeeping Veterans, Don Richardson, Mary E. Long, David J. Pedlar
MacDonald Franklin OSI Research Centre
Objectives: To examine the health-related quality of life (HRQOL) in deployed Canadian Forces peacekeeping veterans, addressing associations with posttraumatic stress disorder (PTSD), and depression severity.
Methods: Participants (n = 125) were consecutive male veterans who were referred for a psychiatric assessment. Instruments administered included the Clinician-Administered PTSD Scale, Hamilton Depression Scale, Short-Form-36 Health Survey, and sociodemographic characteristics.
Results: Mental HRQOL was significantly lower for peacekeepers with, than without, PTSD. Using univariate analyses, PTSD and depression severity were each significantly negatively related to mental HRQOL. In sequential regression analyses controlling for age, we found that PTSD and depression severity significantly predicted …
Mapping And Quantifying Hyperpolarized 3he Magnetic Resonance Imaging Apparent Diffusion Coefficient Gradients, Andrea Evans, David G Mccormack, Giles Santyr, Grace Parraga
Mapping And Quantifying Hyperpolarized 3he Magnetic Resonance Imaging Apparent Diffusion Coefficient Gradients, Andrea Evans, David G Mccormack, Giles Santyr, Grace Parraga
Medical Biophysics Publications
We measured hyperpolarized 3He magnetic resonance imaging (MRI) apparent diffusion coefficients (ADC) and quantified ADC gradients in each three-by-three voxel region of interest (ROI). Such local ADC gradients can be represented in vector maps showing the magnitude (|G3x3|) and direction of ADC gradients, providing a qualitative visualization tool and quantitative measurement of airway and air space heterogeneity. Twenty-four subjects (15 male, mean age=67+/-7 yr) with global initiative for chronic obstructive lung disease (GOLD) stage II (n=9, mean age 68+/-6 yr), GOLD stage III chronic obstructive pulmonary disease (COPD; n=7, mean age 67+/-8 yr), and age-matched healthy volunteers (n=8, mean age …
Quantification Of Carotid Vessel Wall And Plaque Thickness Change Using 3d Ultrasound Images, Bernard Chiu, Micaela Egger, J David Spence, Grace Parraga, Aaron Fenster
Quantification Of Carotid Vessel Wall And Plaque Thickness Change Using 3d Ultrasound Images, Bernard Chiu, Micaela Egger, J David Spence, Grace Parraga, Aaron Fenster
Medical Biophysics Publications
Quantitative measurements of carotid plaque burden progression or regression are important in monitoring patients and in evaluation of new treatment options. 3D ultrasound (US) has been used to monitor the progression or regression of carotid artery plaques. This paper reports on the development and application of a method used to analyze changes in carotid plaque morphology from 3D US. The technique used is evaluated using manual segmentations of the arterial wall and lumen from 3D US images acquired in two imaging sessions. To reduce the effect of segmentation variability, segmentation was performed five times each for the wall and lumen. …
Research And Knowledge In Ontario Tobacco Control Networks, Julia J. Bickford, Anita R. Kothari
Research And Knowledge In Ontario Tobacco Control Networks, Julia J. Bickford, Anita R. Kothari
Health Studies Publications
Objectives: This study sought to better understand the role of research knowledge in Ontario tobacco control networks by asking: 1) How is research managed; 2) How is research evaluated; and 3) How is research utilized?
Methods: This is a secondary analysis of a qualitative study based on individual semi-structured interviews with 29 participants between January and May 2006. These participants were purposefully sampled from across four Ministries in the provincial government (n=7), non-government (n=15), and public health organizations (n=7). Interviews were transcribed verbatim and coded and analyzed using QSR N7 qualitative software. This study received ethics approval from The University …
Freesurfer-Initiated Fully-Automated Subcortical Brain Segmentation In Mri Using Large Deformation Diffeomorphic Metric Mapping., Ali R Khan, Lei Wang, Mirza Faisal Beg
Freesurfer-Initiated Fully-Automated Subcortical Brain Segmentation In Mri Using Large Deformation Diffeomorphic Metric Mapping., Ali R Khan, Lei Wang, Mirza Faisal Beg
Brain and Mind Institute Researchers' Publications
Fully-automated brain segmentation methods have not been widely adopted for clinical use because of issues related to reliability, accuracy, and limitations of delineation protocol. By combining the probabilistic-based FreeSurfer (FS) method with the Large Deformation Diffeomorphic Metric Mapping (LDDMM)-based label-propagation method, we are able to increase reliability and accuracy, and allow for flexibility in template choice. Our method uses the automated FreeSurfer subcortical labeling to provide a coarse-to-fine introduction of information in the LDDMM template-based segmentation resulting in a fully-automated subcortical brain segmentation method (FS+LDDMM). One major advantage of the FS+LDDMM-based approach is that the automatically generated segmentations generated are …
Effects Of Early Gestation Gh Administration On Placental And Fetal Development In Sheep., Casey D Wright, Ryan J Orbus, Timothy Regnault, Russell V Anthony
Effects Of Early Gestation Gh Administration On Placental And Fetal Development In Sheep., Casey D Wright, Ryan J Orbus, Timothy Regnault, Russell V Anthony
Paediatrics Publications
Ovine GH (oGH) is synthesized in placental tissue during maximal placental growth and development. Our objectives were to localize oGH mRNA in the placenta, and study the impact of exogenous GH on twin pregnancies during the normal window (35-55 days of gestational age; dGA) of placental expression. In situ hybridization localized oGH mRNA in uterine luminal epithelium but not in tissues of fetal origin. While maternal GH and IGF-I concentrations were increased (P
Operational Stress Injury Social Support: A Canadian Innovation In Professional Peer Support, Don Richardson, Kathy Darte, Stephan Grenier, Allan English, Joe Sharpe
Operational Stress Injury Social Support: A Canadian Innovation In Professional Peer Support, Don Richardson, Kathy Darte, Stephan Grenier, Allan English, Joe Sharpe
MacDonald Franklin OSI Research Centre
No abstract provided.
Mood Symptoms As Comorbidity In Schizophrenia, Amresh Srivastava
Mood Symptoms As Comorbidity In Schizophrenia, Amresh Srivastava
Psychiatry Presentations
No abstract provided.
Effects Of Acute Ethyl Alcohol Consumption On A Psychophysical Measure Of Lateral Inhibition In Human Vision., Kevin D Johnston, Brian Timney
Effects Of Acute Ethyl Alcohol Consumption On A Psychophysical Measure Of Lateral Inhibition In Human Vision., Kevin D Johnston, Brian Timney
Brain and Mind Institute Researchers' Publications
Acute consumption of ethyl alcohol affects a variety of visual functions. However, there have been few systematic attempts to investigate the neural mechanisms underlying these effects. Here, we employed the Westheimer paradigm to investigate the hypothesis that alcohol reduces lateral inhibition within human "perceptive fields", the psychophysical analogue of physiological receptive fields. Westheimer functions obtained under alcohol and no-alcohol conditions at photopic, mesopic, and scotopic levels of adaptation showed changes consistent with an alcohol-induced decrease in lateral inhibition. We conclude that this decrease in lateral inhibition may be responsible for some of the changes in visual perception that result from …
Connexin Expression And Gap Junctional Coupling In Human Cumulus Cells: Contribution To Embryo Quality, Hong-Xing Wang, Dan Tong, Faraj El-Gehani, Francis R. Tekpetey, Gerald M. Kidder
Connexin Expression And Gap Junctional Coupling In Human Cumulus Cells: Contribution To Embryo Quality, Hong-Xing Wang, Dan Tong, Faraj El-Gehani, Francis R. Tekpetey, Gerald M. Kidder
Physiology and Pharmacology Publications
Gap junctional coupling among cumulus cells is important for oogenesis since its deficiency in mice leads to impaired folliculogenesis. Multiple connexins (Cx), the subunits of gap junction channels, have been found within ovarian follicles in several species but little is known about the connexins in human follicles. The aim of this study was to determine which connexins contribute to gap junctions in human cumulus cells and to explore the possible relationship between connexin expression and pregnancy outcome from in vitro fertilization (IVF). Cumulus cells were obtained from IVF patients undergoing intracytoplasmic sperm injection (ICSI). Connexin expression was examined by RT-PCR …
Is Reporting On Interventions A Weak Link In Understanding How And Why They Work? A Preliminary Exploration Using Community Heart Health Exemplars, Barbara Riley, Joanne Macdonald, Omaima Mansi, Anita Kothari, Donna Kurtz, Linda Vontettenborn, Nancy Edwards
Is Reporting On Interventions A Weak Link In Understanding How And Why They Work? A Preliminary Exploration Using Community Heart Health Exemplars, Barbara Riley, Joanne Macdonald, Omaima Mansi, Anita Kothari, Donna Kurtz, Linda Vontettenborn, Nancy Edwards
Anita Kothari
Background: The persistent gap between research and practice compromises the impact of multi-level and multi-strategy community health interventions. Part of the problem is a limited understanding of how and why interventions produce change in population health outcomes. Systematic investigation of these intervention processes across studies requires sufficient reporting about interventions. Guided by a set of best processes related to the design, implementation, and evaluation of community health interventions, this article presents preliminary findings of intervention reporting in the published literature using community heart health exemplars as case examples.
Methods: The process to assess intervention reporting involved three steps: selection of …
Relapse Prevention In Schizophrenia, Amresh Srivastava
Relapse Prevention In Schizophrenia, Amresh Srivastava
Psychiatry Presentations
No abstract provided.
Bovine Oocytes And Early Embryos Express Staufen And Elavl Rna-Binding Proteins., M D Calder, P Madan, A J Watson
Bovine Oocytes And Early Embryos Express Staufen And Elavl Rna-Binding Proteins., M D Calder, P Madan, A J Watson
Obstetrics & Gynaecology Publications
RNA-binding proteins (RBP) influence RNA editing, localization, stability and translation and may contribute to oocyte developmental competence by regulating the stability and turnover of oogenetic mRNAs. The expression of Staufen 1 and 2 and ELAVL1, ELAVL2 RNA-binding proteins during cow early development was characterized. Cumulus-oocyte complexes were collected from slaughterhouse ovaries, matured, inseminated and subjected to embryo culture in vitro. Oocyte or preimplantation embryo pools were processed for RT-PCR and whole-mount immunofluorescence analysis of mRNA expression and protein distribution. STAU1 and STAU2 and ELAVL1 mRNAs and proteins were detected throughout cow preimplantation development from the germinal vesicle (GV) oocyte to …
Quality Assurance Of Radiation Therapy Planning Systems: Current Status And Remaining Challenges., Jacob Van Dyk
Quality Assurance Of Radiation Therapy Planning Systems: Current Status And Remaining Challenges., Jacob Van Dyk
Oncology Publications
Computerized radiation therapy planning systems (RTPSs) are pivotal for treatment planning. The acceptance, commissioning, and quality control of RTPSs are uniquely complex and are described in the American Association of Physicists in Medicine Task Group Report 53 (1998) and International Atomic Energy Agency Technical Report Series No. 430 (2004). The International Atomic Energy Agency also developed a document and data package for use by vendors and purchasers to aid with acceptance testing of RTPSs. This document is based on International Electrotechnical Commission standard 62083 (2000) and describes both "type" tests to be performed in the factory and "site" tests to …
Infertility And Moral Luck: The Politics Of Women Blaming Themselves For Infertility, Carolyn Mcleod, Julie Ponesse
Infertility And Moral Luck: The Politics Of Women Blaming Themselves For Infertility, Carolyn Mcleod, Julie Ponesse
Philosophy Publications
Infertility can be an agonizing experience, especially for women. And, much of the agony has to do with luck: with how unlucky one is in being infertile, and in how much luck is involved in determining whether one can weather the storm of infertility and perhaps have a child in the end. We argue that bad luck associated with being infertile is often bad moral luck for women. The infertile woman often blames herself or is blamed by others for what is happening to her, even when she cannot control or prevent what is happening to her. She has simply …
Lower Than Expected Morbidity And Mortality For An Australian Aboriginal Population: 10-Year Follow-Up In A Decentralised Community, Kevin G. Rowley, Kerin O'Dea, Ian Anderson, Robyn Mcdermott, Karmananda Saraswati, Ricky Tilmouth, Iris Roberts, Joseph Fitz, Zaimin Wang, Alicia Jenkins, James D. Best, Zhiqiang Wang, Alex Brown
Lower Than Expected Morbidity And Mortality For An Australian Aboriginal Population: 10-Year Follow-Up In A Decentralised Community, Kevin G. Rowley, Kerin O'Dea, Ian Anderson, Robyn Mcdermott, Karmananda Saraswati, Ricky Tilmouth, Iris Roberts, Joseph Fitz, Zaimin Wang, Alicia Jenkins, James D. Best, Zhiqiang Wang, Alex Brown
Aboriginal Policy Research Consortium International (APRCi)
Objective: Toexaminemortalityfromallcausesandfromcardiovasculardisease(CVD), and CVD hospitalisation rate for a decentralised Aboriginal community in the Northern Territory. Design and participants: For a community-based cohort of 296 people aged 15 years or older screened in 1995, we reviewed hospital and primary health care records and death certificates for the period up to December 2004 (2800 person-years of follow-up). Mainoutcomemeasures: MortalityfromallcausesandCVD,andhospitalisationwith CVD coded as a primary cause of admission; comparison with prior trends (1988 to 1995) in CVD risk factor prevalence for the community, and with NT-specific Indigenous mortality and hospitalisation rates.
Results: Mortality in the cohort was 964/100 000 person-years, significantly lower than …
Preimplantation Embryo Programming: Transcription, Epigenetics, And Culture Environment., Veronique Duranthon, Andrew J Watson, Patrick Lonergan
Preimplantation Embryo Programming: Transcription, Epigenetics, And Culture Environment., Veronique Duranthon, Andrew J Watson, Patrick Lonergan
Obstetrics & Gynaecology Publications
Preimplantation development directs the formation of an implantation- or attachment-competent embryo so that metabolic interactions with the uterus can occur, pregnancy can be initiated, and fetal development can be sustained. The preimplantation embryo exhibits a form of autonomous development fueled by products provided by the oocyte and also from activation of the embryo's genome. Despite this autonomy, the preimplantation embryo is highly influenced by factors in the external environment and in extreme situations, such as those presented by embryo culture or nuclear transfer, the ability of the embryo to adapt to the changing environmental conditions or chromatin to become reprogrammed …