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Dissertations / Theses on the topic 'Water-fat MRI'

Author: Grafiati

Published: 25 June 2021

Last updated: 29 July 2025

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1

Cui, Chen. "MRI fat-water separation using graph search based methods." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5740.

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The separation of water and fat from multi-echo images is a classic problem in magnetic resonance imaging (MRI) with a wide range of important clinical applications. For example, removal of fat signal can provide better visualization of other signal of interest in MRI scans. In other cases, the fat distribution map can be of great importance in diagnosis. Although many methods have been proposed over the past three decades, robust fat water separation remains a challenge as radiological technology and clinical expectation continue to grow. The problem presents three key difficulties: a) the pr

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2

Saputra, Michael Wijaya. "Water and Fat Image Reconstruction from MRI Raw Multi Coil Data." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-372138.

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n MRI, water and fat signal separation with robust techniques are often helpful in the diagnosis using MRI. Reliable separation of water and fat will help the doctor to get accurate diagnoses such as the size of a tumour. Moreover, fat images can also help in diagnosing the liver and heart condition. To perform water and fat separation, multiple echoes, i.e. measurements of the raw MR signal at different time points, are required. By utilizing the knowledge of the expected signal evolution, it is possible to perform the separation. A main magnetic field is used in MRI. This field is not perfec

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3

Mendoza, Michael A. "Water Fat Separation with Multiple-Acquisition Balanced Steady-State Free Precession MRI." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/4304.

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Magnetic resonance imaging (MRI) is an important medical imaging technique for visualizing soft tissue structures in the body. It has the advantages of being noninvasive and, unlike x-ray, does not rely on ionizing radiation for imaging. In traditional hydrogen-based MRI, the strongest measured signals are generated from the hydrogen nuclei contained in water and fat molecules.Reliable and uniform water fat separation can be used to improve medical diagnosis. In many applications the water component is the primary signal of interest, while the fat component represents a signal which can obscur

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4

Huang, Fangping. "Water and Fat Image Reconstruction in Magnetic Resonance Imaging." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1309791802.

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5

Mehemed, Taha Mohamed M. "Fat-Water Interface on Susceptibility-Weighted Imaging and Gradient-Echo Imaging: Comparison of Phantoms to Intracranial Lipomas." Kyoto University, 2014. http://hdl.handle.net/2433/193572.

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6

Salvati, Roberto. "Development of Magnetic Resonance Imaging (MRI) methods for in vivo quantification of lipids in preclinical models." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1B026/document.

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L'obésité est associée à une augmentation de la morbidité et de la mortalité liée à de nombreuses maladies, y compris le diabète de type 2, l'hypertension et des pathologies hépatiques menant à une surcharge lipidique d’origine non alcoolique. Récemment, l’imagerie par résonance magnétique (IRM) est devenue la méthode de choix pour la quantification non invasive de la graisse. Dans cette thèse, les méthodes d'IRM ont été étudiées sur un scanner préclinique de 4.7T in vitro (fantômes MR) et in vivo (souris). Deux algorithmes de quantifications de la graisse -la méthode de Dixon et l’algorithme

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7

Palosaari, K. (Kari). "Quantitative and semiquantitative imaging techniques in detecting joint inflammation in patients with rheumatoid arthritis:phase-shift water-fat MRI method for fat suppression at 0.23 T, contrast-enhanced dynamic and static MRI, and quantitative ^99mTc-nanocolloid scintigraphy." Doctoral thesis, University of Oulu, 2008. http://urn.fi/urn:isbn:9789514288623.

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Abstract The purpose of this study was to evaluate the value of 0.23T low-field magnetic resonance imaging (MRI) and nanocolloid (NC) scintigraphy in assessing joint pathology associated with rheumatoid arthritis (RA). Fat suppression methods combined with contrast media enhancement aid in distinguishing enhancing inflamed tissue from the surrounding fat, especially in the imaging of arthritic joints. The feasibility and image quality of a phase-shift water-fat MRI method for fat suppression at low-field 0.23T open configuration MR scanner was evaluated. The technique was combined with contra

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8

Berglund, Johan. "Separation of Water and Fat Signal in Magnetic Resonance Imaging : Advances in Methods Based on Chemical Shift." Doctoral thesis, Uppsala universitet, Enheten för radiologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-158111.

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Magnetic resonance imaging (MRI) is one of the most important diagnostic tools of modern healthcare. The signal in medical MRI predominantly originates from water and fat molecules. Separation of the two components into water-only and fat-only images can improve diagnosis, and is the premier non-invasive method for measuring the amount and distribution of fatty tissue. Fat-water imaging (FWI) enables fast fat/water separation by model-based estimation from chemical shift encoded data, such as multi-echo acquisitions. Qualitative FWI is sufficient for visual separation of the components, while

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9

Belbaisi, Adham. "Deep Learning-Based Skeleton Segmentation for Analysis of Bone Marrow and Cortical Bone in Water-Fat Magnetic Resonance Imaging." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297528.

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A major health concern for subjects with diabetes is weaker bones and increased fracture risk. Current clinical assessment of the bone strength is performed by measuring Bone Mineral Density (BMD), where low BMD-values are associated with an increased risk of fracture. However, subjects with Type 2 Diabetes (T2D) have been shown to have normal or higher BMD-levels compared to healthy controls, which does not reflect the recognized bone fragility among diabetics. Thus, there is need for more research about diabetes-related bone fragility to find other factors of impaired bone health. One potent

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10

Johnson, David Herbert. "Phenotyping Rodent Models of Obesity Using Magnetic Resonance Imaging." Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1250086728.

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11

Josset, Anne. "Suivi par thermométrie par imagerie par résonance magnétique (IRM) des ablations thermiques dans les tissus mous." Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAD040.

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Les ablations thermiques constituent des alternatives prometteuses aux techniques conventionnelles, notamment pour le traitement de cancers. Le caractère minimalement invasif de ces thérapies contribue à réduire la morbidité et les effets secondaires, transformant ainsi la prise en charge des patients. Toutefois, cela nécessite l’utilisation d’outils appropriés pour un suivi en temps réel des thérapies afin d’attester un traitement efficace et d’assurer la sécurité de la procédure. La thermométrie par Imagerie par Résonance Magnétique (IRM) est reconnue comme le gold standard pour monitorer ce

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12

Flask, Christopher Alan. "RAPID DIXON ACQUISITIONS FOR WATER / LIPID SEPARATION IN MRI." online version, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=case1100631509.

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13

Wang, Hui-Chun, and 王慧君. "The Comparison of Various Fat Suppression Techniques Performance on Water-Fat Phantom in MRI." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/69647972005971513017.

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碩士<br>義守大學<br>資訊工程學系碩士在職專班<br>99<br>Fat suppression is a common MRI (Magnetic Resonance Imaging) technique routinely used to suppress the signal from adipose tissue. It may be used to reduce chemical shift artifacts, increase conspicuity of contrast-enhanced tumors, or improve tissue characterization. The purpose of this study is to compare the efficiency of various fat suppression techniques on water-fat phantom by using MRI. All scans were performed on a GE Signa HDxt 1.5T scanner. The home-made water-fat phantom consists of eleven homogeneous water-fat tubes been prepared in various fat fra

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14

Sun, Chin-Chih, and 孫進智. "Evaluate the Rat Fatty Liver by CT, MRI and MR Spectroscopy compare with Fat-Water Mixed Phantom Model." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/16068740913576677505.

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碩士<br>國立中山大學<br>生物醫學科學研究所<br>94<br>Hepatic steatosis is common in the general population and is present in 13.25% of donor organs. It can affect graft survival and recovery of the donor after partial hepatectomy. Liver biopsy is the standard method to measure the degree of hepatic steatosis, but it’s also an invasive procedure and may have sampling error. Non-invasive tools, such as computed tomography and magnetic resonance image, are generally utilized and developed. This study was designed to build a standard model for the quantification of the fat content in a fat-water mixed phantom model

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15

Wyatt, Cory Robert. "Development of MR Thermometry Strategies for Hyperthermia of Extremity and Breast Tumors." Diss., 2010. http://hdl.handle.net/10161/2438.

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<p>Numerous studies have shown that the combination of radiation therapy and hyperthermia, when delivered at moderate temperatures (40°-45°C) for sustained times (30-90 minutes), can help to provide palliative relief and augment tumor response, local control, and survival. However, the dependence of treatment success on achieved temperature highlights the need for accurate thermal dosimetry, so that the prescribed thermal dose can be delivered to the tumor. This can be achieved noninvasively with MR thermometry. However, there are many challenges to performing MR thermometry in the breast,

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16

CHANG, HENG-HAN, and 張恆翰. "Alternation of Vertebral Bone Marrow Perfusion, Fat, Water Composition and Trabeculation on MRI and Micro-CT in a 5/6 Nephrectomy Rat Model of Chronic Kidney Disease." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/qm7ghf.

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碩士<br>國防醫學院<br>生物及解剖學研究所<br>106<br>Chronic kidney disease (CKD) is a global public health issue by progression loss of kidney function. Alternation of bone marrow perfusion may resulting from the atherosclerotic change caused by disturbances in calcium and phosphorus homeostasis of vessels. Our study aims to investigate the bone marrow perfusion with dynamic contrast enhanced (DCE)-MRI with pharmacokinetic model and meanwhile to measure the possible fat/water content and trabeculation change by using T2* mapping, MR spectroscopy (MRS) and micro computed tomography (μCT). Twelve rats were rando

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17

Tan, Zhengguo. "Advances in real-time phase-contrast flow MRI and multi-echo radial FLASH." Doctoral thesis, 2016. http://hdl.handle.net/11858/00-1735-0000-0028-8763-3.

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