76 recherche sur le mot-clé 'Magnetic Resonance Imaging'

Analysis of neuroanatomical differences in mice with genetically modified serotonin transporters assessed by structural magnetic resonance imaging / J. ELLEGOOD in Molecular Autism, 9 (2018)  

Public ISBD [article]  inMolecular Autism > 9 (2018) . - 24p. Titre : Analysis of neuroanatomical differences in mice with genetically modified serotonin transporters assessed by structural magnetic resonance imaging Type de document : Texte imprimé et/ou numérique Auteurs : J. ELLEGOOD, Auteur ; Y. YEE, Auteur ; T. M. KERR, Auteur ; C. L. MULLER, Auteur ; R. D. BLAKELY, Auteur ; R. M. HENKELMAN, Auteur ; J. VEENSTRA-VANDERWEELE, Auteur ; J. P. LERCH, Auteur Article en page(s) : 24p. Langues : Anglais (eng) Mots-clés : Animals  Brain/diagnostic imaging/metabolism  Female  Magnetic Resonance Imaging  Male  Mice  Mice, Inbred C57BL  Mutation  Neurons/metabolism  Serotonin/metabolism  Serotonin Plasma Membrane Transport Proteins/genetics/metabolism  5-ht  5htt  Brain  Dorsal raphe  Magnetic resonance imaging  Neurodevelopment  Serotonin  Slc6a4 Index. décimale : PER Périodiques Résumé : Background: The serotonin (5-HT) system has long been implicated in autism spectrum disorder (ASD) as indicated by elevated whole blood and platelet 5-HT, altered platelet and brain receptor and transporter binding, and genetic linkage and association findings. Based upon work in genetically modified mice, 5-HT is known to influence several aspects of brain development, but systematic neuroimaging studies have not previously been reported. In particular, the 5-HT transporter (serotonin transporter, SERT; 5-HTT) gene, Slc6a4, has been extensively studied. Methods: Using a 7-T MRI and deformation-based morphometry, we assessed neuroanatomical differences in an Slc6a4 knockout mouse on a C57BL/6 genetic background, along with an Slc6a4 Ala56 knockin mouse on two different genetic backgrounds (129S and C57BL/6). Results: Individually (same sex, same background, same genotype), the only differences found were in the female Slc6a4 knockout mouse; all the others had no significant differences. However, an analysis of variance across the whole study sample revealed a significant effect of Slc6a4 on the amygdala, thalamus, dorsal raphe nucleus, and lateral and frontal cortices. Conclusions: This work shows that an increase or decrease in SERT function has a significant effect on the neuroanatomy in 5-HT relevant regions, particularly the raphe nuclei. Notably, the Slc6a4 Ala56 knockin alone appears to have an insignificant, but suggestive, effect compared to the KO, which is consistent with Slc6a4 function. Despite the small number of 5-HT neurons and their localization to the brainstem, it is clear that 5-HT plays an important role in neuroanatomical organization. En ligne : https://dx.doi.org/10.1186/s13229-018-0210-z Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=371 [article] Analysis of neuroanatomical differences in mice with genetically modified serotonin transporters assessed by structural magnetic resonance imaging [Texte imprimé et/ou numérique] / J. ELLEGOOD, Auteur ; Y. YEE, Auteur ; T. M. KERR, Auteur ; C. L. MULLER, Auteur ; R. D. BLAKELY, Auteur ; R. M. HENKELMAN, Auteur ; J. VEENSTRA-VANDERWEELE, Auteur ; J. P. LERCH, Auteur . - 24p. Langues : Anglais (eng) in Molecular Autism > 9 (2018) . - 24p. Mots-clés : Animals  Brain/diagnostic imaging/metabolism  Female  Magnetic Resonance Imaging  Male  Mice  Mice, Inbred C57BL  Mutation  Neurons/metabolism  Serotonin/metabolism  Serotonin Plasma Membrane Transport Proteins/genetics/metabolism  5-ht  5htt  Brain  Dorsal raphe  Magnetic resonance imaging  Neurodevelopment  Serotonin  Slc6a4 Index. décimale : PER Périodiques Résumé : Background: The serotonin (5-HT) system has long been implicated in autism spectrum disorder (ASD) as indicated by elevated whole blood and platelet 5-HT, altered platelet and brain receptor and transporter binding, and genetic linkage and association findings. Based upon work in genetically modified mice, 5-HT is known to influence several aspects of brain development, but systematic neuroimaging studies have not previously been reported. In particular, the 5-HT transporter (serotonin transporter, SERT; 5-HTT) gene, Slc6a4, has been extensively studied. Methods: Using a 7-T MRI and deformation-based morphometry, we assessed neuroanatomical differences in an Slc6a4 knockout mouse on a C57BL/6 genetic background, along with an Slc6a4 Ala56 knockin mouse on two different genetic backgrounds (129S and C57BL/6). Results: Individually (same sex, same background, same genotype), the only differences found were in the female Slc6a4 knockout mouse; all the others had no significant differences. However, an analysis of variance across the whole study sample revealed a significant effect of Slc6a4 on the amygdala, thalamus, dorsal raphe nucleus, and lateral and frontal cortices. Conclusions: This work shows that an increase or decrease in SERT function has a significant effect on the neuroanatomy in 5-HT relevant regions, particularly the raphe nuclei. Notably, the Slc6a4 Ala56 knockin alone appears to have an insignificant, but suggestive, effect compared to the KO, which is consistent with Slc6a4 function. Despite the small number of 5-HT neurons and their localization to the brainstem, it is clear that 5-HT plays an important role in neuroanatomical organization. En ligne : https://dx.doi.org/10.1186/s13229-018-0210-z Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=371

The Feasibility of Magnetic Resonance Imaging in a Non-Selective Comprehensive Clinical Trial in Pediatric Autism Spectrum Disorder / Marilena M. DEMAYO in Journal of Autism and Developmental Disorders, 52-3 (March 2022)  

Public ISBD [article]  inJournal of Autism and Developmental Disorders > 52-3 (March 2022) . - p.1211-1222 Titre : The Feasibility of Magnetic Resonance Imaging in a Non-Selective Comprehensive Clinical Trial in Pediatric Autism Spectrum Disorder Type de document : Texte imprimé et/ou numérique Auteurs : Marilena M. DEMAYO, Auteur ; I. POKORSKI, Auteur ; Y. J. C. SONG, Auteur ; R. THAPA, Auteur ; S. PATEL, Auteur ; Zahava AMBARCHI, Auteur ; D. SOLIGO, Auteur ; I. SADELI, Auteur ; E. E. THOMAS, Auteur ; I. B. HICKIE, Auteur ; A. J. GUASTELLA, Auteur Article en page(s) : p.1211-1222 Langues : Anglais (eng) Mots-clés : Autism Spectrum Disorder/diagnostic imaging  Brain  Child  Child, Preschool  Feasibility Studies  Humans  Magnetic Resonance Imaging/methods  Autism spectrum disorders  Biomarkers  Brain function  Brain structure  Clinical trial  Interventions–pharmacologic  Magnetic resonance imaging  Neuroimaging  Pre-school children  School-age children Index. décimale : PER Périodiques Résumé : There is an increasing interest in using magnetic resonance imaging (MRI) as a tool for precision medicine in autism spectrum disorder (ASD). This study investigated the feasibility of MRI scanning in a large comprehensive, inclusive and test heavy clinical trial for children (aged 3-12 years) with ASD, without functioning constraints for participation. Of the 71 participants enrolled who consented to the MRI, 24 participants (38%) successfully completed an MRI scan at baseline along with other assessments. This scanning followed a familiarization procedure at two preceding visits. At post-treatment, 21 participants successfully completed the MRI scan. This study highlights the challenge of completing MRI assessments in ASD populations when conducted as one of a number of tests in a clinical trial. En ligne : http://dx.doi.org/10.1007/s10803-021-05028-2 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=455 [article] The Feasibility of Magnetic Resonance Imaging in a Non-Selective Comprehensive Clinical Trial in Pediatric Autism Spectrum Disorder [Texte imprimé et/ou numérique] / Marilena M. DEMAYO, Auteur ; I. POKORSKI, Auteur ; Y. J. C. SONG, Auteur ; R. THAPA, Auteur ; S. PATEL, Auteur ; Zahava AMBARCHI, Auteur ; D. SOLIGO, Auteur ; I. SADELI, Auteur ; E. E. THOMAS, Auteur ; I. B. HICKIE, Auteur ; A. J. GUASTELLA, Auteur . - p.1211-1222. Langues : Anglais (eng) in Journal of Autism and Developmental Disorders > 52-3 (March 2022) . - p.1211-1222 Mots-clés : Autism Spectrum Disorder/diagnostic imaging  Brain  Child  Child, Preschool  Feasibility Studies  Humans  Magnetic Resonance Imaging/methods  Autism spectrum disorders  Biomarkers  Brain function  Brain structure  Clinical trial  Interventions–pharmacologic  Magnetic resonance imaging  Neuroimaging  Pre-school children  School-age children Index. décimale : PER Périodiques Résumé : There is an increasing interest in using magnetic resonance imaging (MRI) as a tool for precision medicine in autism spectrum disorder (ASD). This study investigated the feasibility of MRI scanning in a large comprehensive, inclusive and test heavy clinical trial for children (aged 3-12 years) with ASD, without functioning constraints for participation. Of the 71 participants enrolled who consented to the MRI, 24 participants (38%) successfully completed an MRI scan at baseline along with other assessments. This scanning followed a familiarization procedure at two preceding visits. At post-treatment, 21 participants successfully completed the MRI scan. This study highlights the challenge of completing MRI assessments in ASD populations when conducted as one of a number of tests in a clinical trial. En ligne : http://dx.doi.org/10.1007/s10803-021-05028-2 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=455

A Comparison of Safety and Efficacy of Dexmedetomidine and Propofol in Children with Autism and Autism Spectrum Disorders Undergoing Magnetic Resonance Imaging / K. ABULEBDA in Journal of Autism and Developmental Disorders, 48-9 (September 2018)  

Public ISBD [article]  inJournal of Autism and Developmental Disorders > 48-9 (September 2018) . - p.3127-3132 Titre : A Comparison of Safety and Efficacy of Dexmedetomidine and Propofol in Children with Autism and Autism Spectrum Disorders Undergoing Magnetic Resonance Imaging Type de document : Texte imprimé et/ou numérique Auteurs : K. ABULEBDA, Auteur ; R. LOUER, Auteur ; R. LUTFI, Auteur ; S. S. AHMED, Auteur Article en page(s) : p.3127-3132 Langues : Anglais (eng) Mots-clés : Autism  Deep sedation  Dexmedetomidine  Magnetic resonance imaging  Propofol Index. décimale : PER Périodiques Résumé : Children with autism and autism spectrum disorders have a high incidence of neurologic comorbidities. Consequently, evaluation with magnetic resonance imaging (MRI) is deemed necessary. Sedating these patients poses several challenges. This retrospective study compared the efficacy and safety of dexmedetomidine to propofol in sedating autistic patients undergoing MRI. There were 56 patients in the dexmedetomidine group and 49 in the propofol group. All of the patients successfully completed the procedure. Recovery and discharge times were significantly lower in the propofol group, while the dexmedetomidine group maintained more stable hemodynamics. Both propofol and dexmedetomidine proved to be adequate and safe medications in the sedation of autistic children undergoing MRI. En ligne : http://dx.doi.org/10.1007/s10803-018-3582-1 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=367 [article] A Comparison of Safety and Efficacy of Dexmedetomidine and Propofol in Children with Autism and Autism Spectrum Disorders Undergoing Magnetic Resonance Imaging [Texte imprimé et/ou numérique] / K. ABULEBDA, Auteur ; R. LOUER, Auteur ; R. LUTFI, Auteur ; S. S. AHMED, Auteur . - p.3127-3132. Langues : Anglais (eng) in Journal of Autism and Developmental Disorders > 48-9 (September 2018) . - p.3127-3132 Mots-clés : Autism  Deep sedation  Dexmedetomidine  Magnetic resonance imaging  Propofol Index. décimale : PER Périodiques Résumé : Children with autism and autism spectrum disorders have a high incidence of neurologic comorbidities. Consequently, evaluation with magnetic resonance imaging (MRI) is deemed necessary. Sedating these patients poses several challenges. This retrospective study compared the efficacy and safety of dexmedetomidine to propofol in sedating autistic patients undergoing MRI. There were 56 patients in the dexmedetomidine group and 49 in the propofol group. All of the patients successfully completed the procedure. Recovery and discharge times were significantly lower in the propofol group, while the dexmedetomidine group maintained more stable hemodynamics. Both propofol and dexmedetomidine proved to be adequate and safe medications in the sedation of autistic children undergoing MRI. En ligne : http://dx.doi.org/10.1007/s10803-018-3582-1 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=367

Cortical morphological markers in children with autism: a structural magnetic resonance imaging study of thickness, area, volume, and gyrification / D. Y. YANG in Molecular Autism, 7 (2016)  

Public ISBD [article]  inMolecular Autism > 7 (2016) . - 11p. Titre : Cortical morphological markers in children with autism: a structural magnetic resonance imaging study of thickness, area, volume, and gyrification Type de document : Texte imprimé et/ou numérique Auteurs : D. Y. YANG, Auteur ; D. BEAM, Auteur ; Kevin A. PELPHREY, Auteur ; Sebiha M. ABDULLAHI, Auteur ; R. J. JOU, Auteur Article en page(s) : 11p. Langues : Anglais (eng) Mots-clés : Age Factors  Cerebral Cortex/pathology  Child  Child Development Disorders, Pervasive/pathology  Child, Preschool  Gray Matter/pathology  Humans  Image Processing, Computer-Assisted  Magnetic Resonance Imaging  Male  Neuroimaging  Organ Size  White Matter/pathology  Autism spectrum disorder  Brain development  Brain structure  Neuroanatomy  Surface-based morphometry Index. décimale : PER Périodiques Résumé : BACKGROUND: Individuals with autism spectrum disorder (ASD) have been characterized by altered cerebral cortical structures; however, the field has yet to identify consistent markers and prior studies have included mostly adolescents and adults. While there are multiple cortical morphological measures, including cortical thickness, surface area, cortical volume, and cortical gyrification, few single studies have examined all these measures. The current study analyzed all of the four measures and focused on pre-adolescent children with ASD. METHODS: We employed the FreeSurfer pipeline to examine surface-based morphometry in 60 high-functioning boys with ASD (mean age = 8.35 years, range = 4-12 years) and 41 gender-, age-, and IQ-matched typically developing (TD) peers (mean age = 8.83 years), while testing for age-by-diagnosis interaction and between-group differences. RESULTS: During childhood and in specific regions, ASD participants exhibited a lack of normative age-related cortical thinning and volumetric reduction and an abnormal age-related increase in gyrification. Regarding surface area, ASD and TD exhibited statistically comparable age-related development during childhood. Across childhood, ASD relative to TD participants tended to have higher mean levels of gyrification in specific regions. Within ASD, those with higher Social Responsiveness Scale total raw scores tended to have greater age-related increase in gyrification in specific regions during childhood. CONCLUSIONS: ASD is characterized by cortical neuroanatomical abnormalities that are age-, measure-, statistical model-, and region-dependent. The current study is the first to examine the development of all four cortical measures in one of the largest pre-adolescent samples. Strikingly, Neurosynth-based quantitative reverse inference of the surviving clusters suggests that many of the regions identified above are related to social perception, language, self-referential, and action observation networks-those frequently found to be functionally altered in individuals with ASD. The comprehensive, multilevel analyses across a wide range of cortical measures help fill a knowledge gap and present a complex but rich picture of neuroanatomical developmental differences in children with ASD. En ligne : http://dx.doi.org/10.1186/s13229-016-0076-x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=329 [article] Cortical morphological markers in children with autism: a structural magnetic resonance imaging study of thickness, area, volume, and gyrification [Texte imprimé et/ou numérique] / D. Y. YANG, Auteur ; D. BEAM, Auteur ; Kevin A. PELPHREY, Auteur ; Sebiha M. ABDULLAHI, Auteur ; R. J. JOU, Auteur . - 11p. Langues : Anglais (eng) in Molecular Autism > 7 (2016) . - 11p. Mots-clés : Age Factors  Cerebral Cortex/pathology  Child  Child Development Disorders, Pervasive/pathology  Child, Preschool  Gray Matter/pathology  Humans  Image Processing, Computer-Assisted  Magnetic Resonance Imaging  Male  Neuroimaging  Organ Size  White Matter/pathology  Autism spectrum disorder  Brain development  Brain structure  Neuroanatomy  Surface-based morphometry Index. décimale : PER Périodiques Résumé : BACKGROUND: Individuals with autism spectrum disorder (ASD) have been characterized by altered cerebral cortical structures; however, the field has yet to identify consistent markers and prior studies have included mostly adolescents and adults. While there are multiple cortical morphological measures, including cortical thickness, surface area, cortical volume, and cortical gyrification, few single studies have examined all these measures. The current study analyzed all of the four measures and focused on pre-adolescent children with ASD. METHODS: We employed the FreeSurfer pipeline to examine surface-based morphometry in 60 high-functioning boys with ASD (mean age = 8.35 years, range = 4-12 years) and 41 gender-, age-, and IQ-matched typically developing (TD) peers (mean age = 8.83 years), while testing for age-by-diagnosis interaction and between-group differences. RESULTS: During childhood and in specific regions, ASD participants exhibited a lack of normative age-related cortical thinning and volumetric reduction and an abnormal age-related increase in gyrification. Regarding surface area, ASD and TD exhibited statistically comparable age-related development during childhood. Across childhood, ASD relative to TD participants tended to have higher mean levels of gyrification in specific regions. Within ASD, those with higher Social Responsiveness Scale total raw scores tended to have greater age-related increase in gyrification in specific regions during childhood. CONCLUSIONS: ASD is characterized by cortical neuroanatomical abnormalities that are age-, measure-, statistical model-, and region-dependent. The current study is the first to examine the development of all four cortical measures in one of the largest pre-adolescent samples. Strikingly, Neurosynth-based quantitative reverse inference of the surviving clusters suggests that many of the regions identified above are related to social perception, language, self-referential, and action observation networks-those frequently found to be functionally altered in individuals with ASD. The comprehensive, multilevel analyses across a wide range of cortical measures help fill a knowledge gap and present a complex but rich picture of neuroanatomical developmental differences in children with ASD. En ligne : http://dx.doi.org/10.1186/s13229-016-0076-x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=329

Early magnetic resonance imaging biomarkers of schizophrenia spectrum disorders: Toward a fetal imaging perspective / Tayyib T. A. HAYAT in Development and Psychopathology, 33-3 (August 2021)  

Public ISBD [article]  inDevelopment and Psychopathology > 33-3 (August 2021) . - p.899-913 Titre : Early magnetic resonance imaging biomarkers of schizophrenia spectrum disorders: Toward a fetal imaging perspective Type de document : Texte imprimé et/ou numérique Auteurs : Tayyib T. A. HAYAT, Auteur ; Musa B. SAMI, Auteur Article en page(s) : p.899-913 Langues : Anglais (eng) Mots-clés : biomarker  fetal  magnetic resonance imaging  neurodevelopmental disorder  psychosis  schizophrenia Index. décimale : PER Périodiques Résumé : There is mounting evidence to implicate the intrauterine environment as the initial pathogenic stage for neuropsychiatric disease. Recent developments in magnetic resonance imaging technology are making a multimodal analysis of the fetal central nervous system a reality, allowing analysis of structural and functional parameters. Exposures to a range of pertinent risk factors whether preconception or in utero can now be indexed using imaging techniques within the fetus’ physiological environment. This approach may determine the first “hit” required for diseases that do not become clinically manifest until adulthood, and which only have subtle clinical markers during childhood and adolescence. A robust characterization of a “multi-hit” hypothesis may necessitate a longitudinal birth cohort; within this investigative paradigm, the full range of genetic and environmental risk factors can be assessed for their impact on the early developing brain. This will lay the foundation for the identification of novel biomarkers and the ability to devise methods for early risk stratification and disease prevention. However, these early markers must be followed over time: first, to account for neural plasticity, and second, to assess the effects of postnatal exposures that continue to drive the individual toward disease. We explore these issues using the schizophrenia spectrum disorders as an illustrative paradigm. However, given the potential richness of fetal magnetic resonance imaging, and the likely overlap of biomarkers, these concepts may extend to a range of neuropsychiatric conditions. En ligne : http://dx.doi.org/10.1017/S0954579420000218 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=457 [article] Early magnetic resonance imaging biomarkers of schizophrenia spectrum disorders: Toward a fetal imaging perspective [Texte imprimé et/ou numérique] / Tayyib T. A. HAYAT, Auteur ; Musa B. SAMI, Auteur . - p.899-913. Langues : Anglais (eng) in Development and Psychopathology > 33-3 (August 2021) . - p.899-913 Mots-clés : biomarker  fetal  magnetic resonance imaging  neurodevelopmental disorder  psychosis  schizophrenia Index. décimale : PER Périodiques Résumé : There is mounting evidence to implicate the intrauterine environment as the initial pathogenic stage for neuropsychiatric disease. Recent developments in magnetic resonance imaging technology are making a multimodal analysis of the fetal central nervous system a reality, allowing analysis of structural and functional parameters. Exposures to a range of pertinent risk factors whether preconception or in utero can now be indexed using imaging techniques within the fetus’ physiological environment. This approach may determine the first “hit” required for diseases that do not become clinically manifest until adulthood, and which only have subtle clinical markers during childhood and adolescence. A robust characterization of a “multi-hit” hypothesis may necessitate a longitudinal birth cohort; within this investigative paradigm, the full range of genetic and environmental risk factors can be assessed for their impact on the early developing brain. This will lay the foundation for the identification of novel biomarkers and the ability to devise methods for early risk stratification and disease prevention. However, these early markers must be followed over time: first, to account for neural plasticity, and second, to assess the effects of postnatal exposures that continue to drive the individual toward disease. We explore these issues using the schizophrenia spectrum disorders as an illustrative paradigm. However, given the potential richness of fetal magnetic resonance imaging, and the likely overlap of biomarkers, these concepts may extend to a range of neuropsychiatric conditions. En ligne : http://dx.doi.org/10.1017/S0954579420000218 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=457

A systematic review of person-centred adjustments to facilitate magnetic resonance imaging for autistic patients without the use of sedation or anaesthesia / Nikolaos STOGIANNOS in Autism, 26-4 (May 2022)  

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Training the social brain: Clinical and neural effects of an 8-week real-time functional magnetic resonance imaging neurofeedback Phase IIa Clinical Trial in Autism / B. DIREITO in Autism, 25-6 (August 2021)  

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Training the social brain: Clinical and neural effects of an 8-week real-time functional magnetic resonance imaging neurofeedback Phase IIa Clinical Trial in Autism / Bruno DIREITO in Autism, 26-6 (August 2022)  

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Unified framework for early stage status prediction of autism based on infant structural magnetic resonance imaging / K. GAO in Autism Research, 14-12 (December 2021)  

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Increased cerebral lactate levels in adults with autism spectrum disorders compared to non-autistic controls: a magnetic resonance spectroscopy study / Kathrin NICKEL ; Thomas LANGE ; Georg OELTZSCHNER ; Michael DACKO ; Dominique ENDRES ; Kimon RUNGE ; Anke SCHUMANN ; Katharina DOMSCHKE ; Michalis ROUSOS ; Ludger TEBARTZ VAN ELST in Molecular Autism, 14 (2023)  

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