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Water fat imaging

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https://www.readbyqxmd.com/read/29450711/renal-fat-fraction-and-diffusion-tensor-imaging-in-patients-with-early-stage-diabetic-nephropathy
#1
Yuan-Cheng Wang, Yinglian Feng, Chun-Qiang Lu, Shenghong Ju
OBJECTIVE: To investigate the renal fat fraction and water molecular diffusion features in patients with early-stage DN using Dixon imaging and diffusion tensor imaging (DTI). METHODS: Sixty-one type 2 diabetics (normoalbuminuria: n = 40; microalbuminuria: n = 21) and 34 non-diabetic volunteers were included. All participants received three-point Dixon imaging and DTI using a 3.0-T magnetic resonance imager. The fat fraction [FF] and DTI features [fractional anisotropy (FA), apparent diffusion coefficient (ADC), tract counts and length from DTI tractography] were collected...
February 15, 2018: European Radiology
https://www.readbyqxmd.com/read/29448076/single-multi-echo-gre-acquisition-with-short-and-long-echo-spacing-for-simultaneous-quantitative-mapping-of-fat-fraction-b0-inhomogeneity-and-susceptibility
#2
Junmin Liu, Spencer Christiansen, Maria Drangova
Multi-echo gradient echo (mGRE) sequences have been widely adapted in clinical and scientific practice for different purposes to their capability of performing Dixon MRI, generating multi-contrast images and extracting multi-parametric maps. This work aims to extend mGRE-based techniques for imaging whole head, where further technical developments are required due to the co-existence of fat and large B0 inhomogeneity in regions such as the skull base and neck. Specifically, bipolar mGRE data were acquired with a single sequence that contains both a short echo-spacing (ΔTE) echo train to capture water-fat and B0 phase shifts (for proton density fat-fraction (FF) and B0 mapping) and a longer ΔTE echo train (and long echo times) to capture subtle susceptibility variations and R2* information...
February 12, 2018: NeuroImage
https://www.readbyqxmd.com/read/29447203/quantification-of-fetal-organ-volume-and-fat-deposition-following-in-utero-exposure-to-maternal-western-diet-using-mri
#3
Kevin J Sinclair, Lanette J Friesen-Waldner, Colin M McCurdy, Curtis N Wiens, Trevor P Wade, Barbra de Vrijer, Timothy R H Regnault, Charles A McKenzie
PURPOSE: To examine the feasibility of using MRI to identify differences in liver size and fat deposition in fetal guinea pigs exposed to an in utero environment influenced by maternal consumption of a Western diet. MATERIALS AND METHODS: Female guinea pigs fed either an energy-dense Western Diet (WD), comprised of increased saturated fats and simple sugars, or a Control Diet (CD) from weaning through pregnancy, underwent MR scanning near term (~ 60 days; term ~ 69 days)...
2018: PloS One
https://www.readbyqxmd.com/read/29446127/whole-body-mri-for-metastatic-cancer-detection-using-t-2-weighted-imaging-with-fat-and-fluid-suppression
#4
Xinzeng Wang, Ali Pirasteh, James Brugarolas, Neil M Rofsky, Robert E Lenkinski, Ivan Pedrosa, Ananth J Madhuranthakam
PURPOSE: To develop a whole-body MRI technique at 3T with improved lesion conspicuity for metastatic cancer detection using fast, high-resolution and high SNR T 2 -weighted (T 2 W) imaging with simultaneous fat and fluid suppression. THEORY AND METHODS: The proposed dual-echo T 2 -weighted acquisition for enhanced conspicuity of tumors (DETECT) acquires 4 images, in-phase (IP) and out-of-phase (OP) at a short and a long TE using single-shot turbo spin echo. The IP/OP images at the short and long TEs are reconstructed using the standard Dixon and shared-field-map Dixon reconstruction respectively, for robust fat-water separation...
February 14, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29446125/feasibility-of-high-spatiotemporal-resolution-for-an-abbreviated-3d-radial-breast-mri-protocol
#5
Jorge E Jimenez, Roberta M Strigel, Kevin M Johnson, Leah C Henze Bancroft, Scott B Reeder, Walter F Block
PURPOSE: To develop a volumetric imaging technique with 0.8-mm isotropic resolution and 10-s/volume rate to detect and analyze breast lesions in a bilateral, dynamic, contrast-enhanced MRI exam. METHODS: A local low-rank temporal reconstruction approach that also uses parallel imaging and spatial compressed sensing was designed to create rapid volumetric frame rates during a contrast-enhanced breast exam (vastly undersampled isotropic projection [VIPR] spatial compressed sensing with temporal local low-rank [STELLR])...
February 14, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29445907/management-of-serrated-polyps-of-the-colon
#6
REVIEW
Claire Fan, Adam Younis, Christine E Bookhout, Seth D Crockett
PURPOSE OF REVIEW: The purpose of this review is to summarize the management of serrated colorectal polyps (SPs), with a particular focus on the most common premalignant SP, sessile serrated adenoma or polyp (SSA/P). These lesions present a challenge for endoscopists with respect to detection and resection, and are also susceptible to pathologic misdiagnosis. RECENT FINDINGS: Patients with SSA/Ps are at an increased risk of future colorectal neoplasia, including advanced polyps and cancer...
February 14, 2018: Current Treatment Options in Gastroenterology
https://www.readbyqxmd.com/read/29430626/body-size-and-body-composition-effects-on-heat-loss-from-the-hands-during-severe-cold-exposure
#7
Stephanie Payne, Alison Macintosh, Jay Stock
OBJECTIVES: This study investigated the influence of body size and composition on maintaining hand temperature during severe cold exposure. The hand's high surface area-to-volume ratio predisposes the hand to heat loss, increasing the risk of cold injury and even hypothermia, which are major selective pressures in cold environments. While vasoregulation may reduce heat loss from the hand, the effect of body form, tissue thermogenesis, and body insulation on heat loss is unknown. MATERIALS AND METHODS: Thermal imaging was used to determine heat loss during a 3-min ice-water hand immersion test carried out on 114 volunteers (female = 63, male = 51)...
February 11, 2018: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/29415060/precision-of-mri-based-body-composition-measurements-of-postmenopausal-women
#8
Janne West, Thobias Romu, Sofia Thorell, Hanna Lindblom, Emilia Berin, Anna-Clara Spetz Holm, Lotta Lindh Åstrand, Anette Karlsson, Magnus Borga, Mats Hammar, Olof Dahlqvist Leinhard
OBJECTIVES: To determine precision of magnetic resonance imaging (MRI) based fat and muscle quantification in a group of postmenopausal women. Furthermore, to extend the method to individual muscles relevant to upper-body exercise. MATERIALS AND METHODS: This was a sub-study to a randomized control trial investigating effects of resistance training to decrease hot flushes in postmenopausal women. Thirty-six women were included, mean age 56 ± 6 years. Each subject was scanned twice with a 3...
2018: PloS One
https://www.readbyqxmd.com/read/29409819/referenced-mr-thermometry-using-three-echo-phase-based-fat-water-separation-method
#9
Lorne W Hofstetter, Desmond T B Yeo, W Thomas Dixon, Luca Marinelli, Thomas K Foo
A three-point image reconstruction method for internally referenced MR thermometry was developed. The technique exploits the fact that temperature-induced changes in the water resonance frequency are small relative to the chemical shift difference between water and fat signals. This property enabled the use of small angle approximations to derive an analytic phase-based fat-water separation method for MR thermometry. Ethylene glycol and cream cool-down experiments were performed to validate measurement technique...
February 2, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29393668/detection-of-vertebral-metastases-a-comparison-between-the-modified-dixon-turbo-spin-echo-t2-weighted-magnetic-resonance-imaging-and-conventional-t1-weighted-magnetic-resonance-imaging-a-preliminary-study-in-a-tertiary-center
#10
Seok Hahn, Young Han Lee, Jin-Suck Suh
OBJECTIVE: To compare the diagnostic performance of modified Dixon (mDxion) turbo spin echo (TSE) T2-weighted MRI and conventional T1-weighted MRI in vertebral metastasis detection. METHODS: Between September 2014 and October 2016, 33 patients with 68 metastases who had undergone whole-spine MRI were enrolled. The following sagittal image sets were evaluated: T1WI, and mDixon TSE T2-weighted water and fat images. Two radiologists independently evaluated each image-set for metastasis...
February 2, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29392347/diffusion-tensor-imaging-of-dystrophic-skeletal-muscle-comparison-of-two-segmentation-methods-adapted-to-chemical-shift-encoded-water-fat-mri
#11
S Keller, Z J Wang, A Aigner, A C Kim, A Golsari, H Kooijman, G Adam, J Yamamura
PURPOSE: To compare the influence of two different regions of interest (ROIs) on diffusion tensor metrics in dystrophic thigh muscles using a custom-made (whole muscle) ROI including and a selective ROI excluding areas of fatty replacement. METHODS: Diffusion tensor imaging (DTI) and chemical-shift-encoded water-fat magnetic resonance imaging (MRI) of the thigh was conducted on a 3-Tesla system in 15 cases with muscular dystrophy and controls. The ROIs were chosen according to patterns of fatty replacement on co-registered axial DTI and gradient echo sequence (GRE) images...
February 1, 2018: Clinical Neuroradiology
https://www.readbyqxmd.com/read/29340999/introduction-to-mri-physics
#12
Gary V Martinez
Magnetic resonance imaging (MRI) is an imaging technique derived from radiofrequency (RF) signals of proton that are magnetized by a strong magnetic field. These protons typically originate from water, fat, or metabolites. The application of RF pulses is used to excite the magnetization, whereas pulsed magnetic field gradients are used to provide spatial localization. This chapter describes the fundamental principles giving rise to MR images. Furthermore, the connection between relaxation and image contrast is discussed...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29331301/marrow-adipose-tissue-imaging-in-humans
#13
Vibha Singhal, Miriam A Bredella
Bone strength is affected not only by bone mineral density (BMD) and bone microarchitecture but also its microenvironment. Recent studies have focused on the role of marrow adipose tissue (MAT) in the pathogenesis of bone loss. Osteoblasts and adipocytes arise from a common mesenchymal stem cell within bone marrow and many osteoporotic states, including aging, medication use, immobility, over - and undernutrition are associated with increased marrow adiposity. Advancements in imaging technology allow the non-invasive quantification of MAT...
January 10, 2018: Bone
https://www.readbyqxmd.com/read/29324859/magnetic-resonance-spectroscopy-detects-differential-lipid-composition-in-mammary-glands-on-low-fat-high-animal-fat-versus-high-fructose-diets
#14
Dianning He, Devkumar Mustafi, Xiaobing Fan, Sully Fernandez, Erica Markiewicz, Marta Zamora, Jeffrey Mueller, Joseph R Sachleben, Matthew J Brady, Suzanne D Conzen, Gregory S Karczmar
The effects of consumption of different diets on the fatty acid composition in the mammary glands of SV40 T-antigen (Tag) transgenic mice, a well-established model of human triple-negative breast cancer, were investigated with magnetic resonance spectroscopy and spectroscopic imaging. Female C3(1) SV40 Tag transgenic mice (n = 12) were divided into three groups at 4 weeks of age: low fat diet (LFD), high animal fat diet (HAFD), and high fructose diet (HFruD). MRI scans of mammary glands were acquired with a 9...
2018: PloS One
https://www.readbyqxmd.com/read/29323052/quantification-of-intermuscular-and-intramuscular-adipose-tissue-using-magnetic-resonance-imaging-after-neurodegenerative-disorders
#15
REVIEW
Madoka Ogawa, Robert Lester, Hiroshi Akima, Ashraf S Gorgey
Ectopic adiposity has gained considerable attention because of its tight association with metabolic and cardiovascular health in persons with spinal cord injury (SCI). Ectopic adiposity is characterized by the storage of adipose tissue in non-subcutaneous sites. Magnetic resonance imaging (MRI) has proven to be an effective tool in quantifying ectopic adiposity and provides the opportunity to measure different adipose depots including intermuscular adipose tissue (IMAT) and intramuscular adipose tissue (IntraMAT) or intramuscular fat (IMF)...
December 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/29322559/cest-dixon-for-human-breast-lesion-characterization-at-3-t-a-preliminary-study
#16
Shu Zhang, Stephen Seiler, Xinzeng Wang, Ananth J Madhuranthakam, Jochen Keupp, Emily E Knippa, Robert E Lenkinski, Elena Vinogradov
PURPOSE: Chemical exchange saturation transfer (CEST) MRI for breast lesion characterization is promising. However, artifacts are prone to develop in breast CEST imaging as a result of strong lipid signals. The aims of the study are (i) to develop and validate the CEST-Dixon imaging sequence for simultaneous water-fat separation and B0 mapping; and (ii) use the CEST-Dixon method to characterize suspicious lesions in patients undergoing percutaneous biopsy. METHODS: The gradient-echo multi-echo Dixon acquisition is used to create fat-free CEST and B0 maps...
January 10, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29319918/comparison-of-modified-two-point-dixon-and-chemical-shift-encoded-mri-water-fat-separation-methods-for-fetal-fat-quantification
#17
Stephanie A Giza, Michael R Miller, Prasiddha Parthasarathy, Barbra de Vrijer, Charles A McKenzie
BACKGROUND: Fetal fat is indicative of the energy balance within the fetus, which may be disrupted in pregnancy complications such as fetal growth restriction, macrosomia, and gestational diabetes. Water-fat separated MRI is a technique sensitive to tissue lipid content, measured as fat fraction (FF), and can be used to accurately measure fat volumes. Modified two-point Dixon and chemical shift encoded MRI (CSE-MRI) are water-fat separated MRI techniques that could be applied to imaging of fetal fat...
January 10, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29287345/mass-spectrometric-imaging-of-localization-of-fat-molecules-in-water-in-oil-emulsions-containing-semi-solid-fat
#18
Makoto Shiota, Yuichi Shimomura, Mariko Kotera, Shu Taira
Firstly, we report the localization analysis of the lipid components of a water-in-oil (W/O) semi-solid emulsion by mass spectrometry imaging (MSI). Uniform emulsion droplets were prepared using microchannel emulsification devices with lecithin, stearic acid-binding monoglyceride (St-MAG), and polyglycerol polyricinoleate (PGPR) as emulsifiers. The mass image gives us the localization of phosphatidylcholine (PC) in lecithin, St-MAG, tripalmitin (PPP), medium-chain triglyceride (MCT), and high-melting-point triglyceride tristearin (C18-TAG)...
April 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29280322/tissue-sodium-content-is-elevated-in-the-skin-and-subcutaneous-adipose-tissue-in-women-with-lipedema
#19
Rachelle Crescenzi, Adriana Marton, Paula M C Donahue, Helen B Mahany, Sarah K Lants, Ping Wang, Joshua A Beckman, Manus J Donahue, Jens Titze
OBJECTIVE: To test the hypothesis that tissue sodium and adipose content are elevated in patients with lipedema; if confirmed, this could establish precedence for tissue sodium and adipose content representing a discriminatory biomarker for lipedema. METHODS: Participants with lipedema (n = 10) and control (n = 11) volunteers matched for biological sex, age, BMI, and calf circumference were scanned with 3.0-T sodium and conventional proton magnetic resonance imaging (MRI)...
February 2018: Obesity
https://www.readbyqxmd.com/read/29260576/quantification-of-pancreatic-fat-with-dual-echo-imaging-at-3-0-t-mr-in-clinical-application-how-do-the-corrections-for-t1-and-t2-relaxation-effect-work-and-simplified-correction-strategy
#20
Fang Yuan, Bin Song, Zixing Huang, Chunchao Xia, Xijiao Liu
Background Dual-echo imaging is a routine clinical magnetic resonance (MR) sequence affected by T1 and T2* relaxation effect in fat quantification. The separate impacts of T1 and T2* relaxation effect in pancreatic fat quantification using dual-echo imaging at 3.0-T MR have not been reported in detail. Purpose To demonstrate the separate T1 and T2* relaxation effect on pancreatic fat quantification by dual-echo imaging at 3.0-T MR and the simplified correction strategy is discussed for convenient clinical application...
January 1, 2017: Acta Radiologica
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