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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
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
- 기타저자
- University of California, Los Angeles Bioengineering 0288
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017162450
■00520250211152014
■006m o d
■007cr#unu||||||||
■020 ▼a9798382832807
■035 ▼a(MiAaPQ)AAI31331593
■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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