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MRI Reconstruction and Motion Compensation Techniques for Liver Fat and R2* Quantification
MRI Reconstruction and Motion Compensation Techniques for Liver Fat and R2* Quantification
MRI Reconstruction and Motion Compensation Techniques for Liver Fat and R2* Quantification

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211152014
ISBN  
9798382832807
DDC  
610
저자명  
Shih, Shu-Fu.
서명/저자  
MRI Reconstruction and Motion Compensation Techniques for Liver Fat and R2* Quantification
발행사항  
[Sl] : University of California, Los Angeles, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
183 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Wu, Holden H.
학위논문주기  
Thesis (Ph.D.)--University of California, Los Angeles, 2024.
초록/해제  
요약Metabolic dysfunction-associated steatotic liver disease (MASLD), formerly known as non-alcoholic fatty liver disease (NAFLD), is the most common chronic liver disease with a current global prevalence of 25% to 40%. MASLD is associated with the metabolic syndrome and cardiovascular morbidity, and can progress to fibrosis and cirrhosis. Chronic liver diseases such as viral hepatitis and MASLD can also lead to hepatic iron overload. Magnetic resonance imaging (MRI) provides non-invasive evaluation of hepatic steatosis and iron overload by quantifying proton-density fat fraction (PDFF) and R2*. Conventional MRI techniques for liver PDFF and R2* quantification require breath-holding, which can be challenging for children and elderly patients. 3D stack-of-radial MRI techniques have been proposed for self-gated free-breathing liver PDFF and R2* quantification. However, several challenges remain, including residual streaking artifacts from system imperfections, long scan acquisition times, computationally expensive reconstructions, and insufficient modelling of non-rigid liver motion during free-breathing. Techniques to overcome these challenges are important for a wide clinical adoption of free-breathing MRI techniques for liver PDFF and R2* quantification. Additionally, in recent years, there has been an increased interest in lower-field MRI systems. A less expensive lower-field MRI system with a larger bore diameter may improve accessibility and comfort for populations with obesity and at risk for fatty liver diseases. However, the low signal-to-noise ratio problem can impact image quality and quantification accuracy. Therefore, noise reduction techniques are important to improve liver PDFF and R2* quantification in lower-field MRI systems.This work focuses on developing MRI reconstruction techniques to improve liver PDFF and R2* quantification. First, this work developed a phase-preserving beamforming-based technique to effectively reduce radial streaking artifacts from system imperfections. This technique can be further integrated with motion-resolved reconstruction to improve self-gated free-breathing liver PDFF and R2* quantification. Second, this work developed an uncertainty-aware physics-driven deep learning network for rapid reconstruction of PDFF and R2* maps from self-gated free-breathing MRI. The uncertainty maps generated from the network can be used to predict quantification errors and improve reliability of deep learning reconstruction results. Third, this work developed a compressed sensing reconstruction model with non-rigid motion compensation to improve and accelerate self-gated free-breathing liver PDFF and R2* quantification. Last, this work developed and evaluated image and k-space denoising techniques that can improve quantification accuracy and precision of Cartesian-based liver PDFF and R2* quantification at 0.55T. These technical advancements can provide accurate and motion-robust liver fat and R2* quantification.
일반주제명  
Bioengineering
일반주제명  
Medical imaging
일반주제명  
Biomedical engineering
일반주제명  
Nutrition
키워드  
Denoising
키워드  
Fat
키워드  
Liver
키워드  
Motion compensation
키워드  
Chronic liver disease
기타저자  
University of California, Los Angeles Bioengineering 0288
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a610
■1001  ▼aShih,  Shu-Fu.
■24510▼aMRI  Reconstruction  and  Motion  Compensation  Techniques  for  Liver  Fat  and  R2*  Quantification
■260    ▼a[Sl]▼bUniversity  of  California,  Los  Angeles▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a183  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Wu,  Holden  H.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Los  Angeles,  2024.
■520    ▼aMetabolic  dysfunction-associated  steatotic  liver  disease  (MASLD),  formerly  known  as  non-alcoholic  fatty  liver  disease  (NAFLD),  is  the  most  common  chronic  liver  disease  with  a  current  global  prevalence  of  25%  to  40%.  MASLD  is  associated  with  the  metabolic  syndrome  and  cardiovascular  morbidity,  and  can  progress  to  fibrosis  and  cirrhosis.  Chronic  liver  diseases  such  as  viral  hepatitis  and  MASLD  can  also  lead  to  hepatic  iron  overload.  Magnetic  resonance  imaging  (MRI)  provides  non-invasive  evaluation  of  hepatic  steatosis  and  iron  overload  by  quantifying  proton-density  fat  fraction  (PDFF)  and  R2*.  Conventional  MRI  techniques  for  liver  PDFF  and  R2*  quantification  require  breath-holding,  which  can  be  challenging  for  children  and  elderly  patients.  3D  stack-of-radial  MRI  techniques  have  been  proposed  for  self-gated  free-breathing  liver  PDFF  and  R2*  quantification.  However,  several  challenges  remain,  including  residual  streaking  artifacts  from  system  imperfections,  long  scan  acquisition  times, computationally  expensive  reconstructions,  and  insufficient  modelling  of  non-rigid  liver  motion  during  free-breathing.  Techniques  to  overcome  these  challenges  are  important  for  a  wide  clinical  adoption  of  free-breathing  MRI  techniques  for  liver  PDFF  and  R2*  quantification.  Additionally,  in  recent  years,  there  has  been  an  increased  interest  in  lower-field  MRI  systems.  A  less  expensive  lower-field  MRI  system  with  a  larger  bore  diameter  may  improve  accessibility  and  comfort  for  populations  with  obesity  and  at  risk  for  fatty  liver  diseases.  However,  the  low  signal-to-noise  ratio  problem  can  impact  image  quality  and  quantification  accuracy.  Therefore,  noise  reduction  techniques  are  important  to  improve  liver  PDFF  and  R2*  quantification  in  lower-field  MRI  systems.This  work  focuses  on  developing  MRI  reconstruction  techniques  to  improve  liver  PDFF  and  R2*  quantification.  First,  this  work  developed  a  phase-preserving  beamforming-based  technique  to  effectively  reduce  radial  streaking  artifacts  from  system  imperfections.  This  technique  can  be  further  integrated  with  motion-resolved  reconstruction  to  improve  self-gated  free-breathing  liver  PDFF  and  R2*  quantification.  Second,  this  work  developed  an  uncertainty-aware  physics-driven  deep  learning  network  for  rapid  reconstruction  of  PDFF  and  R2*  maps  from  self-gated  free-breathing  MRI.  The  uncertainty  maps  generated  from  the  network  can  be  used  to  predict  quantification  errors  and  improve  reliability  of  deep  learning  reconstruction  results.  Third,  this  work  developed  a  compressed  sensing  reconstruction  model  with  non-rigid  motion  compensation  to  improve  and  accelerate  self-gated  free-breathing  liver  PDFF  and  R2*  quantification.  Last,  this  work  developed  and  evaluated  image  and  k-space  denoising  techniques  that  can  improve  quantification  accuracy  and  precision  of  Cartesian-based  liver  PDFF  and  R2*  quantification  at  0.55T.  These  technical  advancements  can  provide  accurate  and  motion-robust  liver  fat  and  R2*  quantification.
■590    ▼aSchool  code:  0031.
■650  4▼aBioengineering
■650  4▼aMedical  imaging
■650  4▼aBiomedical  engineering
■650  4▼aNutrition
■653    ▼aDenoising
■653    ▼aFat
■653    ▼aLiver
■653    ▼aMotion  compensation
■653    ▼aChronic  liver  disease
■690    ▼a0202
■690    ▼a0574
■690    ▼a0541
■690    ▼a0570
■71020▼aUniversity  of  California,  Los  Angeles▼bBioengineering  0288.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0031
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162450▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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