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Imaging Markers of Microstructural Development in Neonatal Brains and the Impact of Postnatal Pathologies.
Imaging Markers of Microstructural Development in Neonatal Brains and the Impact of Postnatal Pathologies.

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자료유형  
 학위논문
Control Number  
0017160628
International Standard Book Number  
9798382332505
Dewey Decimal Classification Number  
616
Main Entry-Personal Name  
Bobba, Pratheek Sai.
Publication, Distribution, etc. (Imprint  
[S.l.] : Yale University., 2024
Publication, Distribution, etc. (Imprint  
Ann Arbor : ProQuest Dissertations & Theses, 2024
Physical Description  
105 p.
General Note  
Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
General Note  
Advisor: Payabvash, Seyedmehdi.
Dissertation Note  
Thesis (M.D.)--Yale University, 2024.
Summary, Etc.  
요약Rapid changes in diffusion properties and white matter microstructural integrity in neonatal brains complicates the interpretation of advanced MRI techniques such as diffusion weighted (DWI) and diffusion tensor imaging (DTI). Thus, the goal of this work is to characterize age-related normative diffusion patterns in neonates and determine the impacts of postnatal growth trajectory, delivery method, and hypoxic ischemia on neonatal brain diffusion metrics. From a large cohort of neonates who had received brain MRI within 3 months of birth between January 2013 and March 2021, the following cohorts were identified for individual analyses: a cohort of neonates with no neurological abnormality identified on DWI or DTI series, a cohort of very preterm neonates with information in the health record to obtain postnatal weight measurements, a cohort of preterm neonates with information in the health record to obtain delivery method and postnatal complication information, and a cohort of term neonates who had clinical and radiological evidence of hypoxic ischemic encephalopathy. Using both tract based spatial statistics and voxel-wise general linear models, the following were investigated: age-related normative diffusion patterns in neonates, the relationship between postnatal weight gain and brain white matter maturation in very preterm neonates, the relationship between delivery method and brain white matter maturation in preterm neonates, and the relationship between hypoxic ischemic encephalopathy (HIE) severity and ischemic lesion location in term neonates. All analyses were confirmed by utilizing a white matter atlas generated by Johns Hopkins University to conduct white matter tract specific linear regression analyses. Diffuse reduction in apparent diffusivity coefficient (ADC) values was observed across normative neonatal brain with increasing gestational age at time of scan. The highest rates of decline in normative ADC values correlated topographically with the highest rates of increase in normative fractional anisotropy (FA) values and rates of decline in normative mean diffusivity (MD) values. Gestational age at birth was also found to be independently associated with normative diffusion metrics in regions such as the convexity cortex and corpus callosum. An online, interactive, age-adjusted atlas displaying normative changes in ADC, FA, and MD values with increasing gestational age was created and is available for public use. In very preterm neonates, both birth weight and postnatal weight gain were found to be independently associated with DTI metrics of improved white matter development in the corpus callosum and sagittal striatum. In preterm neonates, DTI metrics indicative of reduced WM development were observed in the corpus callosum, internal capsule, and corona radiata of neonates delivered by C-section compared to those delivered vaginally after adjusted for numerous demographic variables and perinatal occurrences as covariates. In term neonates with HIE, mild and moderated HIE was found to be primarily distributed across arterial supply territory border zones and deep and subcortical white matter while severe HIE involved deep grey matter nuceli and the hippocampus. The results presented here may aid the quantitative assessment of DWI and DTI scans for the identification of developmental and pathological abnormalities by providing a reference of normative diffusion metrics in the postnatal period. Furthermore, WM developmental delay in specific brain regions was found to be independently associated with risk factors such as low birth weight, postnatal growth delay, and C-section delivery. These deviations from normative patterns may serve as biomarkers to help identify neonates that may benefit from close neurological follow up to mitigate adverse long term neurological deficits. Lastly, knowledge of the topographical distribution of ischemic lesions with HIE severity may further aid the application of the normative diffusion metric atlas in the identification of subtle ischemic injury.
Subject Added Entry-Topical Term  
Medical imaging.
Subject Added Entry-Topical Term  
Neurosciences.
Subject Added Entry-Topical Term  
Pediatrics.
Index Term-Uncontrolled  
Imaging markers
Index Term-Uncontrolled  
Microstructural development
Index Term-Uncontrolled  
Neonatal brains
Index Term-Uncontrolled  
Mean diffusivity values
Index Term-Uncontrolled  
Fractional anisotropy values
Added Entry-Corporate Name  
Yale University Yale School of Medicine
Host Item Entry  
Dissertations Abstracts International. 85-11B.
Electronic Location and Access  
로그인을 한후 보실 수 있는 자료입니다.
Control Number  
joongbu:656926

MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a616
■1001  ▼aBobba,  Pratheek  Sai.
■24510▼aImaging  Markers  of  Microstructural  Development  in  Neonatal  Brains  and  the  Impact  of  Postnatal  Pathologies.
■260    ▼a[S.l.]▼bYale  University.  ▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a105  p.
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-11,  Section:  B.
■500    ▼aAdvisor:  Payabvash,  Seyedmehdi.
■5021  ▼aThesis  (M.D.)--Yale  University,  2024.
■520    ▼aRapid  changes  in  diffusion  properties  and  white  matter  microstructural  integrity  in  neonatal  brains  complicates  the  interpretation  of  advanced  MRI  techniques  such  as  diffusion  weighted  (DWI)  and  diffusion  tensor  imaging  (DTI).  Thus,  the  goal  of  this  work  is  to  characterize  age-related  normative  diffusion  patterns  in  neonates  and  determine  the  impacts  of  postnatal  growth  trajectory,  delivery  method,  and  hypoxic  ischemia  on  neonatal  brain  diffusion  metrics.  From  a  large  cohort  of  neonates  who  had  received  brain  MRI  within  3  months  of  birth  between  January  2013  and  March  2021,  the  following  cohorts  were  identified  for  individual  analyses:  a  cohort  of  neonates  with  no  neurological  abnormality  identified  on    DWI  or  DTI  series,  a  cohort  of  very  preterm  neonates  with  information  in  the  health  record  to  obtain  postnatal  weight  measurements,  a  cohort  of  preterm  neonates  with  information  in  the  health  record  to  obtain  delivery  method  and  postnatal  complication  information,  and  a  cohort  of  term  neonates  who  had  clinical  and  radiological  evidence  of  hypoxic  ischemic  encephalopathy.  Using  both  tract  based  spatial  statistics  and  voxel-wise  general  linear  models,  the  following  were  investigated:  age-related  normative  diffusion  patterns  in  neonates,  the  relationship  between  postnatal  weight  gain  and  brain  white  matter  maturation  in  very  preterm  neonates,  the  relationship  between  delivery  method  and  brain  white  matter  maturation  in  preterm  neonates,  and  the  relationship  between  hypoxic  ischemic  encephalopathy  (HIE)  severity  and  ischemic  lesion  location  in  term  neonates.  All  analyses  were  confirmed  by  utilizing  a  white  matter  atlas  generated  by  Johns  Hopkins  University  to  conduct  white  matter  tract  specific  linear  regression  analyses.  Diffuse  reduction  in  apparent  diffusivity  coefficient  (ADC)  values  was  observed  across  normative  neonatal  brain  with  increasing  gestational  age  at  time  of  scan.  The  highest  rates  of  decline  in  normative  ADC  values  correlated  topographically  with  the  highest  rates  of  increase  in  normative  fractional  anisotropy  (FA)  values  and  rates  of  decline  in  normative  mean  diffusivity  (MD)  values.  Gestational  age  at  birth  was  also  found  to  be  independently  associated  with  normative  diffusion  metrics  in  regions  such  as  the  convexity  cortex  and  corpus  callosum.  An  online,  interactive,  age-adjusted  atlas  displaying  normative  changes  in  ADC,  FA,  and  MD  values  with  increasing  gestational  age  was  created  and  is  available  for  public  use.  In  very  preterm  neonates,  both  birth  weight  and  postnatal  weight  gain  were  found  to  be  independently  associated  with  DTI  metrics  of  improved  white  matter  development  in  the  corpus  callosum  and  sagittal  striatum.  In  preterm  neonates,  DTI  metrics  indicative  of  reduced  WM  development  were  observed  in  the  corpus  callosum,  internal  capsule,  and  corona  radiata  of  neonates  delivered  by  C-section  compared  to  those  delivered  vaginally  after  adjusted  for  numerous  demographic  variables  and  perinatal  occurrences  as  covariates.  In  term  neonates  with  HIE,  mild  and  moderated  HIE  was  found  to  be  primarily  distributed  across  arterial  supply  territory  border  zones  and  deep  and  subcortical  white  matter  while  severe  HIE  involved  deep  grey  matter  nuceli  and  the  hippocampus.  The  results  presented  here  may  aid  the  quantitative  assessment  of  DWI  and  DTI  scans  for  the  identification  of  developmental  and  pathological  abnormalities  by  providing  a  reference  of  normative  diffusion  metrics  in  the  postnatal  period.  Furthermore,  WM  developmental  delay  in  specific  brain  regions  was  found  to  be  independently  associated  with  risk  factors  such  as  low  birth  weight,  postnatal  growth  delay,  and  C-section  delivery.  These  deviations  from  normative  patterns  may  serve  as  biomarkers  to  help  identify  neonates  that  may  benefit  from  close  neurological  follow  up  to  mitigate  adverse  long  term  neurological  deficits.  Lastly,  knowledge  of  the  topographical  distribution  of  ischemic  lesions  with  HIE  severity  may  further  aid  the  application  of  the  normative  diffusion  metric  atlas  in  the  identification  of  subtle  ischemic  injury.
■590    ▼aSchool  code:  0265.
■650  4▼aMedical  imaging.
■650  4▼aNeurosciences.
■650  4▼aPediatrics.
■653    ▼aImaging  markers
■653    ▼aMicrostructural  development
■653    ▼aNeonatal  brains
■653    ▼aMean  diffusivity  values
■653    ▼aFractional  anisotropy  values
■690    ▼a0574
■690    ▼a0767
■690    ▼a0317
■71020▼aYale  University▼bYale  School  of  Medicine.
■7730  ▼tDissertations  Abstracts  International▼g85-11B.
■790    ▼a0265
■791    ▼aM.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160628▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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