Search results for "Dixon"

showing 5 items of 5 documents

Reliability of measuring the fat content of the lumbar vertebral marrow and paraspinal muscles using MRI mDIXON-quant sequence

2018

PURPOSE We aimed to assess the reliability of measuring the fat content of the lumbar vertebral marrow and the paraspinal muscles using magnetic resonance imaging (MRI) mDIXON-Quant sequence. METHODS Thirty-one healthy volunteers were included. All participants underwent liver mDIXON-Quant imaging on a 3.0 T Philips MRI scanner by observer A. Within two weeks, observer B repeated the scan. After the examination, each observer independently measured the fat content of the third lumbar vertebra (L3), and the psoas (PS), erector spinae (ES), and multifidus (MF) muscles on central L3 axial images. After two weeks, each observer repeated the same measurements. They were blinded to their previous…

AdultMaleObserver (quantum physics)Intraclass correlationInterclass correlationParaspinal MusclesBone Marrow CellsRisk Assessment030218 nuclear medicine & medical imaging03 medical and health sciences0302 clinical medicineLumbarBone MarrowmedicineHumansRadiology Nuclear Medicine and imagingReliability (statistics)Observer VariationReproducibilityLumbar Vertebraemedicine.diagnostic_testbusiness.industryReproducibility of ResultsMagnetic resonance imagingRepeatabilityMiddle AgedmDIXON-Quant sequenceMuscoloskeletal ImagingMagnetic Resonance ImagingAdipose TissueFemaleCardiology and Cardiovascular MedicineNuclear medicinebusiness030217 neurology & neurosurgery
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On the moments of Cochran's Q statistic under the null hypothesis, with application to the meta-analysis of risk difference.

2011

W. G. Cochran's Q statistic was introduced in 1937 to test for equality of means under heteroscedasticity. Today, the use of Q is widespread in tests for homogeneity of effects in meta-analysis, but often these effects (such as risk differences and odds ratios) are not normally distributed. It is common to assume that Q follows a chi-square distribution, but it has long been known that this asymptotic distribution for Q is not accurate for moderate sample sizes. In this paper, the effect and weight for an individual study may depend on two parameters: the effect and a nuisance parameter. We present expansions for the first two moments of Q without any normality assumptions. Our expansions w…

HeteroscedasticityStatisticsQ-statisticChi-square testEconometricsNuisance parameterAsymptotic distributionCochran's C testDixon's Q testEducationCochran's Q testMathematicsResearch synthesis methods
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Improved contrast for myeloma focal lesions with T2-weighted Dixon images compared to T1-weighted images

2019

International audience; Purpose: The purpose of this study was twofold. First, to compare the contrast between spinal multiple myeloma (MM) focal lesions and surrounding bone marrow obtained on T2-weighted Dixon fat-only MR images to that obtained on T1-weighted spin-echo images. Second, to search for correlation between bone marrow fat fraction assessed by T2-weighted Dixon sequence and International Myeloma Working Group myeloma defining events.Materials and methods: A total of 39 patients with 112 focal MM lesions were included. There were 25 men and 14 women with a mean age of 68.8±9.8 [SD] years (range: 49-88 years). Contrast between focal MM lesions and surrounding bone marrow was cal…

Malemedia_common.quotation_subject[SDV]Life Sciences [q-bio]Signal-To-Noise Ratio030218 nuclear medicine & medical imagingLesion03 medical and health sciences0302 clinical medicineBone MarrowImage Interpretation Computer-AssistedmedicineT1 weightedHumansContrast (vision)Radiology Nuclear Medicine and imagingMagnetic resonance imaging (MRI)Correlation testMultiple myelomaAgedRetrospective Studiesmedia_commonAged 80 and overSpinal NeoplasmsRadiological and Ultrasound Technologybusiness.industryMean ageGeneral MedicineMiddle AgedImage Enhancementmedicine.diseaseDixon sequenceMagnetic Resonance Imaging[SDV] Life Sciences [q-bio]medicine.anatomical_structure030220 oncology & carcinogenesisFemaleBone marrowmedicine.symptomMultiple MyelomabusinessT2 weightedNuclear medicine
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Cultural institutions as agents of urban and community regeneration in the (post-)pandemic city. The case of the «Laboratorio Zen Insieme» in Palermo

2022

Although all cities in the world have been affected by the COVID-19 pandemic, its impacts on the territories, yet to be understood, are unevenly distributed, revealing extremely varied imbalances depending on the places. However, it is clear that the virus and its variants have aggravated pre-existing socio-spatial inequalities, creating new ones and bringing attention back to those implications between space, planning, public health and citizenship that are at the origins of contemporary urbanism. In a reference framework in which the crisis is globalized but unequal and in the absence of a welfare system capable of responding to the urgencies of the most marginalized social contexts and g…

Olsen 2018Settore ICAR/21 - UrbanisticaSettore M-GGR/01 - GeografiaSacco and Blessi 2009). In the current (post-) pandemic context and through the lens of a southern European perspective the purpose of this article is to critically reflect about the role of culture as possible vehicle of urban and community regeneration. In particular we will focus on the activities of the no profit organization «Laboratorio Zen Insieme» in ZEN2 one of the last large popular and peripheral neighborhoods built in Palermo at the end of 80s in order to explore and understand how cultural practices work as agent of urban and social transformation capable of addressing emerging issues especially in the pandemic scenario we are experiencing. Thecasestudy has been conducted through analysis of documents participative observations (Honer and Hitzler 2015) and qualitative in-depth interviews with key actors involved in the conception organization and management of the activities carried out by Laboratorio Zen Insieme with representatives of local institutions and non-formal conversations with participants of the workshops heldin the neighborhood. The experience we narrate finds that cultural practices have re-conceptualized their design and functions as strategies of urban and community regeneration and at the same time have contributed to answer to emergent issues in developing proximity and local based strategies facing up to problems inherent civil rights educationalpoverty socio-spatial justice and have changed the image and identity of urban places they inhabit.In this sense the research provides a framework for development of strategies and legitimization for cultural practices and a point of discussionabouttheirrolein urban development.Although all cities in the world have been affected by the COVID-19 pandemic its impacts on the territories yet to be understood are unevenly distributed revealing extremely varied imbalances depending on the places. However it is clear that the virus and its variants have aggravated pre-existing socio-spatial inequalities creating new ones and bringing attention back to those implications between space planning public health and citizenship that are at the origins of contemporary urbanism. In a reference framework in which the crisis is globalized but unequal and in the absence of a welfare system capable of responding to the urgencies of the most marginalized social contexts and groups a response to the new social and individual needs has been offered by cultural institutions that play a role of territorial agency often independently or in the absence of political institutions. Far from the idea of entertainment and divertissement it is in fact increasingly clear how the practices of cultural innovation experimenting with various forms of action and participation can in some cases play a fundamental role in the processes of social cohesion and community building representing an antidote to the worsening of the phenomena of marginalization and socio-spatial inequalities within cities and territories (Colantonio and Dixon 2011
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Characterization of Intervertebral Disc Changes in Asymptomatic Individuals with Distinct Physical Activity Histories Using Three Different Quantitat…

2020

(1) Background: Assessments of intervertebral disc (IVD) changes, and IVD tissue adaptations due to physical activity, for example, remains challenging. Newer magnetic resonance imaging techniques can quantify detailed features of the IVD, where T2-mapping and T2-weighted (T2w) and Dixon imaging are potential candidates. Yet, their relative utility has not been examined. The performances of these techniques were investigated to characterize IVD differences in asymptomatic individuals with distinct physical activity histories. (2) Methods: In total, 101 participants (54 women) aged 25&ndash

musculoskeletal diseasesnikamavälilevysport medicinemagneettikuvauslcsh:Rlcsh:Medicinemusculoskeletal systemArticleselkärankaDixonmagnetic resonance imagingDixon imagingintervertebral discT2-mappingfyysinen aktiivisuusJournal of Clinical Medicine
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