keyword
MENU ▼
Read by QxMD icon Read
search

Water fat imaging

keyword
https://www.readbyqxmd.com/read/28438322/water-fat-dixon-sequences-in-the-evaluation-of-breast-implants-proposal-of-a-time-effective-rapid-approach-in-the-clinical-practice
#1
M Marcon, A S Becker, E J Ulbrich, T Frauenfelder, A Boss
AIM: To evaluate the diagnostic accuracy achieved from a fat-water Dixon sequence alone compared to a combination of a silicone-specific magnetic resonance imaging (MRI) sequence and a water-specific MRI sequence in the assessment of breast implants. MATERIALS AND METHODS: In this institutional review board (IRB)-approved study the integrity of breast implants was assessed retrospectively in 27 patients undergoing breast MRI at 3 T. A qualitative evaluation of (set 1) a silicon-selective water-saturated short tau inversion recovery (STIR) sequence in combination with a water-only Dixon dataset (total acquisition time 7 minutes 17 seconds), and of (set 2) fat-only and water-only Dixon datasets (4 minutes 8 seconds) was performed by two readers independently evaluating the following features: margin definition of the implant, water suppression homogeneity, image quality, presence of artefacts and their effects on the imaging interpretation, and diagnostic confidence...
April 21, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28432403/bone-marrow-fat-content-in-70-adolescent-girls-with-anorexia-nervosa-magnetic-resonance-imaging-and-magnetic-resonance-spectroscopy-assessment
#2
Kirsten Ecklund, Sridhar Vajapeyam, Robert V Mulkern, Henry A Feldman, Jennifer M O'Donnell, Amy D DiVasta, Catherine M Gordon
BACKGROUND: Adolescents and women with anorexia nervosa have increased bone marrow fat and decreased bone formation, at least in part due to hormonal changes leading to preferential stem cell differentiation to adipocytes over osteoblasts. OBJECTIVE: The purpose of this study was to evaluate marrow fat content and correlate with age and disease severity using knee MRI with T1 relaxometry (T1-R) and MR spectroscopy (MRS) in 70 adolescents with anorexia nervosa. MATERIALS AND METHODS: We enrolled 70 girls with anorexia nervosa who underwent 3-T knee MRI with coronal T1-W images, T1-R and single-voxel proton MRS at 30 and 60 ms TE...
April 22, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28427472/optimising-conservative-management-of-chronic-low-back-pain-study-protocol-for-a-randomised-controlled-trial
#3
Katherine J Simson, Clint T Miller, Jon Ford, Andrew Hahne, Luana Main, Timo Rantalainen, Wei-Peng Teo, Megan Teychenne, David Connell, Guy Trudel, Guoyan Zheng, Gary Thickbroom, Daniel L Belavy
BACKGROUND: Lower back pain is a global health issue affecting approximately 80% of people at some stage in their life. The current literature suggests that any exercise is beneficial for reducing back pain. However, as pain is a subjective evaluation and physical deficits are evident in low back pain, using it as the sole outcome measure to evaluate superiority of an exercise protocol for low back pain treatment is insufficient. The overarching goal of the current clinical trial is to implement two common, conservative intervention approaches and examine their impact on deficits in chronic low back pain...
April 20, 2017: Trials
https://www.readbyqxmd.com/read/28403942/mr-signal-fat-fraction-analysis-and-t2-weighted-imaging-measure-bat-reliably-on-humans-without-cold-exposure
#4
Milja Holstila, Marko Pesola, Teemu Saari, Kalle Koskensalo, Juho Raiko, Ronald J H Borra, Pirjo Nuutila, Riitta Parkkola, Kirsi A Virtanen
OBJECTIVE: Brown adipose tissue (BAT) is compositionally distinct from white adipose tissue (WAT) in terms of triglyceride and water content. In adult humans, the most significant BAT depot is localized in the supraclavicular area. Our aim is to differentiate brown adipose tissue from white adipose tissue using fat T2* relaxation time mapping and signal-fat-fraction (SFF) analysis based on a commercially available modified 2-point-Dixon (mDixon) water-fat separation method. We hypothesize that magnetic resonance (MR) imaging can reliably measure BAT regardless of the cold-induced metabolic activation, with BAT having a significantly higher water and iron content compared to WAT...
May 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28399917/metformin-and-sulodexide-restore-cardiac-microvascular-perfusion-capacity-in-diet-induced-obese-rats
#5
Judith van Haare, M Eline Kooi, Jurgen W G E van Teeffelen, Hans Vink, Jos Slenter, Hanneke Cobelens, Gustav J Strijkers, Dennis Koehn, Mark J Post, Marc van Bilsen
BACKGROUND: Disturbances in coronary microcirculatory function, such as the endothelial glycocalyx, are early hallmarks in the development of obesity and insulin resistance. Accordingly, in the present study myocardial microcirculatory perfusion during rest and stress was assessed following metformin or sulodexide therapy in a rat model of diet-induced obesity. Additionally, the effect of degradation of the glycocalyx on myocardial perfusion was assessed in chow-fed rats. METHODS: Rats were fed a high fat diet (HFD) for 8 weeks and were divided into a group without therapy, and groups that received the anti-diabetic drug metformin or the glycocalyx-stabilizing drug sulodexide in their drinking water during the last 4 weeks of the feeding period...
April 11, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/28398929/comprehensive-dynamic-contrast-enhanced-3d-magnetic-resonance-imaging-of-the-breast-with-fat-water-separation-and-high-spatiotemporal-resolution-using-radial-sampling-compressed-sensing-and-parallel-imaging
#6
Thomas Benkert, Kai Tobias Block, Samantha Heller, Melanie Moccaldi, Daniel K Sodickson, Sungheon Gene Kim, Linda Moy
OBJECTIVES: The aim of this study was to assess the applicability of Dixon radial volumetric encoding (Dixon-RAVE) for comprehensive dynamic contrast-enhanced 3D magnetic resonance imaging (MRI) of the breast using a combination of radial sampling, model-based fat/water separation, compressed sensing, and parallel imaging. MATERIALS AND METHODS: In this Health Insurance Portability and Accountability Act-compliant prospective study, 24 consecutive patients underwent bilateral breast MRI, including both conventional fat-suppressed and non-fat-suppressed precontrast T1-weighted volumetric interpolated breath-hold examination (VIBE)...
April 11, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28383778/the-effect-of-noise-and-lipid-signals-on-determination-of-gaussian-and-non-gaussian-diffusion-parameters-in-skeletal-muscle
#7
Donnie Cameron, Mustapha Bouhrara, David A Reiter, Kenneth W Fishbein, Seongjin Choi, Christopher M Bergeron, Luigi Ferrucci, Richard G Spencer
This work characterizes the effect of lipid and noise signals on muscle diffusion parameter estimation in several conventional and non-Gaussian models, the ultimate objectives being to characterize popular fat suppression approaches for human muscle diffusion studies, to provide simulations to inform experimental work and to report normative non-Gaussian parameter values. The models investigated in this work were the Gaussian monoexponential and intravoxel incoherent motion (IVIM) models, and the non-Gaussian kurtosis and stretched exponential models...
April 6, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28382554/measurement-of-vertebral-bone-marrow-proton-density-fat-fraction-in-children-using-quantitative-water-fat-mri
#8
Stefan Ruschke, Amber Pokorney, Thomas Baum, Holger Eggers, Jeffrey H Miller, Houchun H Hu, Dimitrios C Karampinos
OBJECTIVES: To investigate the feasibility of employing a 3D time-interleaved multi-echo gradient-echo (TIMGRE) sequence to measure the proton density fat fraction (PDFF) in the vertebral bone marrow (VBM) of children and to examine cross-sectional changes with age and intra-individual variations from the lumbar to the cervical region in the first two decades of life. MATERIALS AND METHODS: Quantitative water-fat imaging of the spine was performed in 93 patients (49 girls; 44 boys; age median 4...
April 5, 2017: Magma
https://www.readbyqxmd.com/read/28363661/breast-fat-volume-measurement-using-wide-bore-3%C3%A2-t-mri-comparison-of-traditional-mammographic-density-evaluation-with-mri-density-measurements-using-automatic-segmentation
#9
E Petridou, M Kibiro, C Gladwell, P Malcolm, A Toms, A Juette, M Borga, O Dahlqvist Leinhard, T Romu, B Kasmai, E Denton
AIM: To compare magnetic resonance imaging (MRI)-derived breast density measurements using automatic segmentation algorithms with radiologist estimations using the Breast Imaging Reporting and Data Systems (BI-RADS) density classification. MATERIALS AND METHODS: Forty women undergoing mammography and dynamic breast MRI as part of their clinical management were recruited. Fat-water separated MRI images derived from a two-point Dixon technique, phase-sensitive reconstruction, and atlas-based segmentation were obtained before and after intravenous contrast medium administration...
March 28, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28342191/exploiting-multicompartment-effects-in-triple-echo-steady-state-t2-mapping-for-fat-fraction-quantification
#10
Dian Liu, Andreas Steingoetter, Jelena Curcic, Sebastian Kozerke
PURPOSE: To investigate and exploit the effect of intravoxel off-resonance compartments in the triple-echo steady-state (TESS) sequence without fat suppression for T2 mapping and to leverage the results for fat fraction quantification. METHODS: In multicompartment tissue, where at least one compartment is excited off-resonance, the total signal exhibits periodic modulations as a function of echo time (TE). Simulated multicompartment TESS signals were synthesized at various TEs...
March 25, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28341872/childhood-adversity-associated-with-white-matter-alteration-in-the-corpus-callosum-corona-radiata-and-uncinate-fasciculus-of-psychiatrically-healthy-adults
#11
Simon McCarthy-Jones, Lena K L Oestreich, Amanda E Lyall, Zora Kikinis, Dominick T Newell, Peter Savadjiev, Martha E Shenton, Marek Kubicki, Ofer Pasternak, Thomas J Whitford
Diffusion tensor imaging studies report childhood adversity (CA) is associated with reduced fractional anisotropy (FA) in multiple white matter tracts in adults. Reduced FA may result from changes in tissue, suggesting myelin/axonal damage, and/or from increased levels of extracellular free-water, suggesting atrophy or neuroinflammation. Free-water imaging can separately identify FA in tissue (FAT) and the fractional volume of free-water (FW). We tested whether CA was associated with altered FA, FAT, and FW in seven white matter regions of interest (ROI), in which FA changes had been previously linked to CA (corona radiata, corpus callosum, fornix, cingulum bundle: hippocampal projection, inferior fronto-occipital fasciculus, superior longitudinal fasciculus, uncinate fasciculus)...
March 25, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28324157/water-fat-mri-in-a-hibernator-reveals-seasonal-growth-of-white-and-brown-adipose-tissue-without-cold-exposure
#12
Amanda MacCannell, Kevin Sinclair, Lannette Friesen-Waldner, Charles A McKenzie, James F Staples
Obligate hibernators, such as ground squirrels, display circannual patterns which persist even under constant laboratory conditions, suggesting that they are regulated by endogenous rhythms. Brown adipose tissue (BAT) is important for thermogenesis during periodic arousals from hibernation when core body temperature rises spontaneously from 5 to 37 °C. In most small eutherians BAT growth requires several weeks of cold exposure. We hypothesized that in the thirteen-lined ground squirrel (Ictidomys tridecemlineatus), a hibernator, BAT growth is regulated, in part, by an endogenous rhythm and we predicted that this growth would precede the hibernation season without cold exposure...
March 21, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28306547/synthetic-ct-for-mri-based-liver-stereotactic-body-radiotherapy-treatment-planning
#13
Jeremy S Bredfeldt, Lianli Liu, Mary Feng, Yue Cao, James M Balter
A technique for generating MRI-derived synthetic CT volumes (MRCTs) is demonstrated in support of adaptive liver stereotactic body radiation therapy (SBRT). Under IRB approval, 16 subjects with hepatocellular carcinoma were scanned using a single MR pulse sequence (T1 Dixon). Air-containing voxels were identified by intensity thresholding on T1-weighted, water and fat images. The envelope of the anterior vertebral bodies was segmented from the fat image and fuzzy-C-means (FCM) was used to classify each non-air voxel as mid-density, lower-density, bone, or marrow in the abdomen, with only bone and marrow classified within the vertebral body envelope...
April 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28278002/quantifying-abdominal-adipose-tissue-and-thigh-muscle-volume-and-hepatic-proton-density-fat-fraction-repeatability-and-accuracy-of-an-mr-imaging-based-semiautomated-analysis-method
#14
Michael S Middleton, William Haufe, Jonathan Hooker, Magnus Borga, Olof Dahlqvist Leinhard, Thobias Romu, Patrik Tunón, Gavin Hamilton, Tanya Wolfson, Anthony Gamst, Rohit Loomba, Claude B Sirlin
Purpose To determine the repeatability and accuracy of a commercially available magnetic resonance (MR) imaging-based, semiautomated method to quantify abdominal adipose tissue and thigh muscle volume and hepatic proton density fat fraction (PDFF). Materials and Methods This prospective study was institutional review board- approved and HIPAA compliant. All subjects provided written informed consent. Inclusion criteria were age of 18 years or older and willingness to participate. The exclusion criterion was contraindication to MR imaging...
May 2017: Radiology
https://www.readbyqxmd.com/read/28275542/parkinson-s-disease-diffusion-mri-is-not-affected-by-acute-antiparkinsonian-medication
#15
Jae Woo Chung, Roxana G Burciu, Edward Ofori, Priyank Shukla, Michael S Okun, Christopher W Hess, David E Vaillancourt
OBJECTIVE: A prior longitudinal study demonstrates that free-water diffusion magnetic resonance imaging (dMRI) tracks progression in the substantia nigra (Ofori et al., 2015b). Here, we test the acute effects of antiparkinsonian medication on this established imaging progression marker for the first time. METHODS: Fifteen PD patients underwent dMRI OFF and ON-medication one day apart. ON-medication, patients were tested approximately 45 min after their usual dose of antiparkinsonian medication...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28263827/a-fast-method-for-the-quantification-of-fat-fraction-and-relaxation-times-comparison-of-five-sites-of-bone-marrow
#16
Caroline Le Ster, Jérémy Lasbleiz, Stephan Kannengiesser, Raphaël Guillin, Giulio Gambarota, Hervé Saint-Jalmes
PURPOSE: Bone marrow is found either as red bone marrow, which mainly contains haematopoietic cells, or yellow bone marrow, which mainly contains adipocytes. In adults, red bone marrow is principally located in the axial skeleton. A recent study has introduced a method to simultaneously estimate the fat fraction (FF), the T1 and T2* relaxation times of water (T1w, T2*w) and fat (T1f and T2*f) in the vertebral bone marrow. The aim of the current study was to measure FF, T1w, T1f, T2*w and T2*f in five sites of bone marrow, and to assess the presence of regional variations...
March 2, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28263425/fast-bilateral-breast-coverage-with-high-spectral-and-spatial-resolution-hiss-mri-at-3t
#17
Milica Medved, Hui Li, Hiroyuki Abe, Deepa Sheth, Gillian M Newstead, Olufunmilayo I Olopade, Maryellen L Giger, Gregory S Karczmar
PURPOSE: To develop and assess a full-coverage, sensitivity encoding (SENSE)-accelerated breast high spatial and spectral resolution (HiSS) magnetic resonance imaging (MRI) within clinically reasonable times as a potential nonenhanced MRI protocol for breast density measurement or breast cancer screening. MATERIALS AND METHODS: Sixteen women with biopsy-proven cancer or suspicious lesions, and 13 women who were healthy volunteers or were screened for breast cancer, received 3T breast MRI exams, including SENSE-accelerated HiSS MRI, which was implemented as a submillimeter spatial resolution echo-planar spectroscopic imaging (EPSI) sequence...
March 6, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28247430/a-novel-phase-unwrapping-method-based-on-pixel-clustering-and-local-surface-fitting-with-application-to-dixon-water-fat-mri
#18
Junying Cheng, Yingjie Mei, Biaoshui Liu, Jijing Guan, Xiaoyun Liu, Ed X Wu, Qianjin Feng, Wufan Chen, Yanqiu Feng
PURPOSE: To develop and evaluate a novel 2D phase-unwrapping method that works robustly in the presence of severe noise, rapid phase changes, and disconnected regions. THEORY AND METHODS: The MR phase map usually varies rapidly in regions adjacent to wraps. In contrast, the phasors can vary slowly, especially in regions distant from tissue boundaries. Based on this observation, this paper develops a phase-unwrapping method by using a pixel clustering and local surface fitting (CLOSE) approach to exploit different local variation characteristics between the phase and phasor data...
March 1, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28244504/ambulatory-function-in-motor-incomplete-spinal-cord-injury-a-magnetic-resonance-imaging-study-of-spinal-cord-edema-and-lower-extremity-muscle-morphometry
#19
A C Smith, K A Weber, T B Parrish, T G Hornby, V M Tysseling, J G McPherson, M Wasielewski, J M Elliott
STUDY DESIGN: This research utilized a cross-sectional design. OBJECTIVES: Spinal cord edema length has been measured with T2-weighted sagittal MRI to predict motor recovery following spinal cord injury. The purpose of our study was to establish the correlational value of axial spinal cord edema using T2-weighted MRI. We hypothesized a direct relationship between the size of damage on axial MRI and walking ability, motor function and distal muscle changes seen in motor incomplete spinal cord injury (iSCI)...
February 28, 2017: Spinal Cord
https://www.readbyqxmd.com/read/28241015/a-concept-for-holistic-whole-body-mri-data-analysis-imiomics
#20
Robin Strand, Filip Malmberg, Lars Johansson, Lars Lind, Magnus Sundbom, Håkan Ahlström, Joel Kullberg
PURPOSE: To present and evaluate a whole-body image analysis concept, Imiomics (imaging-omics) and an image registration method that enables Imiomics analyses by deforming all image data to a common coordinate system, so that the information in each voxel can be compared between persons or within a person over time and integrated with non-imaging data. METHODS: The presented image registration method utilizes relative elasticity constraints of different tissue obtained from whole-body water-fat MRI...
2017: PloS One
keyword
keyword
32056
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"