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Water fat imaging

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https://www.readbyqxmd.com/read/29022681/body-image-dissatisfaction-and-weight-control-behaviour-in-slovak-adolescents
#1
Martina Bašková, Jana Holubčíková, Tibor Baška
OBJECTIVES: The aim of the study was to examine body-image dissatisfaction in adolescents aged 13-15 years reporting to be on a diet and to assess gender and age differences in weight-reduction behaviour in Slovak adolescents. METHODS: Data on a representative sample of 2,765 adolescents (mean age 14.37 years) from the Slovak part of Health Behaviour in School Aged Children Study carried out in 2014 were analysed. Self-reported body-image dissatisfaction and engagement in weight-reduction behaviour of 13 to 15-year-old adolescents was assessed using multiple logistic regression models...
September 2017: Central European Journal of Public Health
https://www.readbyqxmd.com/read/29017799/automated-segmentation-of-abdominal-subcutaneous-adipose-tissue-and-visceral-adipose-tissue-in-obese-adolescent-in-mri
#2
Steve C N Hui, Teng Zhang, Lin Shi, Defeng Wang, Chei-Bing Ip, Winnie C W Chu
PURPOSE: To develop a reliable and reproducible automatic technique to segment and measure SAT and VAT based on MRI. MATERIALS AND METHODS: Chemical-shift water-fat MRI were taken on twelve obese adolescents (mean age: 16.1±0.6, BMI: 31.3±2.3) recruited under the health monitoring program. The segmentation applied a spoke template created using Midpoint Circle algorithm followed by Bresenham's Line algorithm to detect narrow connecting regions between subcutaneous and visceral adipose tissues...
October 7, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28983966/joint-water-fat-separation-and-deblurring-for-spiral-imaging
#3
Dinghui Wang, Nicholas R Zwart, James G Pipe
PURPOSE: Most previous approaches to spiral Dixon water-fat imaging perform the water-fat separation and deblurring sequentially based on the assumption that the phase accumulation and blurring as a result of off-resonance are separable. This condition can easily be violated in regions where the B0 inhomogeneity varies rapidly. The goal of this work is to present a novel joint water-fat separation and deblurring method for spiral imaging. METHODS: The proposed approach is based on a more accurate signal model that takes into account the phase accumulation and blurring simultaneously...
October 5, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28982632/a-data-oriented-self-calibration-and-robust-chemical-shift-encoding-by-using-clusterization-oscar-theory-optimization-and-clinical-validation-in-neuromuscular-disorders
#4
G Siracusano, A La Corte, M Gaeta, G Finocchio
Multi-echo Chemical Shift-Encoded (CSE) methods for Fat-Water quantification are growing in clinical use due to their ability to estimate and correct some confounding effects. State of the art CSE water/fat separation approaches rely on a multi-peak fat spectrum with peak frequencies and relative amplitudes kept constant over the entire MRI dataset. However, the latter approximation introduces a systematic error in fat percentage quantification in patients where the differences in lipid chemical composition are significant (such as for neuromuscular disorders) because of the spatial dependence of the peak amplitudes...
October 2, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28980212/injectable-facial-fillers-imaging-features-complications-and-diagnostic-pitfalls-at-mri-and-pet-ct
#5
REVIEW
Pravin Mundada, Romain Kohler, Sana Boudabbous, Laurence Toutous Trellu, Alexandra Platon, Minerva Becker
Injectable fillers are widely used for facial rejuvenation, correction of disabling volumetric fat loss in HIV-associated facial lipoatrophy, Romberg disease, and post-traumatic facial disfiguring. The purpose of this article is to acquaint the reader with the anatomy of facial fat compartments, as well as with the properties and key imaging features of commonly used facial fillers, filler-related complications, interpretation pitfalls, and dermatologic conditions mimicking filler-related complications. The distribution of facial fillers is characteristic and depends on the anatomy of the superficial fat compartments...
October 4, 2017: Insights Into Imaging
https://www.readbyqxmd.com/read/28971513/rapid-dual-echo-ramped-hybrid-encoding-mr-based-attenuation-correction-drhe-mrac-for-pet-mr
#6
Hyungseok Jang, Fang Liu, Tyler Bradshaw, Alan B McMillan
PURPOSE: In this study, we propose a rapid acquisition for MR-based attenuation correction (MRAC) in positron emission tomography (PET)/MR imaging, in which an ultrashort echo time (UTE) image and an out-of-phase echo image are obtained within a single rapid scan (35 s) at high spatial resolution (1 mm(3) ), which allows accurate estimation of a pseudo CT image using 4-class tissue classification (discrete bone, discrete air, continuous fat, and continuous water). METHODS: In dual-echo ramped hybrid encoding (dRHE), a UTE echo is directly followed by a second out-of-phase echo, in which hybrid spatial encoding combining single-point imaging and 3-dimensional radial frequency encoding is used to improve the quality of both images...
October 2, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28956970/lymphedema-leads-to-fat-deposition-in-muscle-and-decreased-muscle-water-volume-after-liposuction-a-magnetic-resonance-imaging-study
#7
Mattias Hoffner, Pernilla Peterson, Sven Månsson, Håkan Brorson
BACKGROUND: Lymphedema leads to adipose tissue deposition. Water-fat magnetic resonance imaging (MRI) can quantify and localize fat and water. The presence of excess fat and excess water/muscle in the subfascial compartment of the lymphedematous limb has not been investigated before. The aim of this study was to investigate epifascial and subfascial fat and water contents in patients with chronic lymphedema before and after liposuction. METHODS AND RESULTS: Seven patients with arm lymphedema and six with leg lymphedema were operated on...
September 28, 2017: Lymphatic Research and Biology
https://www.readbyqxmd.com/read/28956956/edema-areas-of-calves-measured-with-magnetic-resonance-imaging-as-a-novel-indicator-for-early-staging-of-lower-extremity-lymphedema
#8
Li Wang, Xiaoying Wu, Mingfeng Wu, Zizhou Zhao, Hui Tang, Suqin Li, Lianming Wu, Shiteng Suo, Qing Lu
BACKGROUND: Staging of lower extremity lymphedema (LEL) is difficult in clinical work. The excellent soft tissue contrast of magnetic resonance imaging (MRI) enables soft tissue changes to be feasibly and reproducibly characterized and distinguished. AIM: To determine whether cross-section areas of edema calves measured with MRI could be useful for staging of the LEL. MATERIALS AND METHODS: We recruited 138 participants who were clinically diagnosed with LEL: 61 unilateral and 77 bilateral LEL...
September 28, 2017: Lymphatic Research and Biology
https://www.readbyqxmd.com/read/28936896/fat-fraction-mapping-using-magnetic-resonance-imaging-insight-into-pathophysiology
#9
Timothy J P Bray, Manil D Chouhan, Shonit Punwani, Alan Bainbridge, Margaret A Hall-Craggs
Adipose cells have traditionally been viewed as a simple, passive energy storage depot for triglycerides. However, in recent years it has become clear that adipose cells are highly physiologically active and have a multitude of endocrine, metabolic, haematological and immune functions. Changes in the number or size of adipose cells may be directly implicated in disease (for example, in the metabolic syndrome), but may also be linked to other pathological processes such as inflammation, malignant infiltration or infarction...
September 22, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28932698/quantitative-magnetic-resonance-mr-neurography-for-evaluation-of-peripheral-nerves-and-plexus-injuries
#10
REVIEW
Teodoro Martín Noguerol, Rafael Barousse, Mariano Socolovsky, Antonio Luna
Traumatic conditions of peripheral nerves and plexus have been classically evaluated by morphological imaging techniques and electrophysiological tests. New magnetic resonance imaging (MRI) studies based on 3D fat-suppressed techniques are providing high accuracy for peripheral nerve injury evaluation from a qualitative point of view. However, these techniques do not provide quantitative information. Diffusion weighted imaging (DWI) and diffusion tensor imaging (DTI) are functional MRI techniques that are able to evaluate and quantify the movement of water molecules within different biological structures...
August 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28920539/the-effects-of-stabilization-splint-treatment-on-the-volume-of-masseter-muscle-in-sleep-bruxism-patients
#11
Suleyman Hakan Tuna, Osman Evren Celik, Onder Ozturk, Murat Golpinar, Aykut Aktas, Huseyin Avni Balcioglu, Filiz Keyf, Bunyamin Sahin
Objective The aim of this study was to evaluate, quantitatively, the volumetric effects of stabilization splint therapy on the masseter muscle of sleep bruxism (SB) patients. Methods The magnetic resonance (MR) images of 16 SB patients diagnosed by polysomnography (PSG) who used stabilization splints for four months were obtained before and after the therapy. The masseter muscle volume was calculated using Cavalieri's principle on the MR images. Results After the splint therapy, the mean volume of the masseter muscle did not reduce significantly...
September 18, 2017: Cranio: the Journal of Craniomandibular Practice
https://www.readbyqxmd.com/read/28913879/short-t2-imaging-using-a-3d-double-adiabatic-inversion-recovery-prepared-ultrashort-echo-time-cones-3d-dir-ute-cones-sequence
#12
Ya-Jun Ma, Yanchun Zhu, Xing Lu, Michael Carl, Eric Y Chang, Jiang Du
PURPOSE: To investigate high contrast imaging of short T2 tissues with a three-dimensional double adiabatic inversion recovery prepared ultrashort echo time Cones (3D DIR-UTE-Cones) sequence. METHODS: The sequence used two sequential adiabatic inversion pulses to suppress signals from long T2 tissues, followed by multispoke UTE acquisition to detect signals from short T2 tissues. The two adiabatic inversion pulses are identical with a center frequency located at the water peak, but the spectral width is broad enough to cover both water and fat frequencies...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28905416/sar-and-scan-time-optimized-3d-whole-brain-double-inversion-recovery-imaging-at-7t
#13
Eberhard D Pracht, Thorsten Feiweier, Philipp Ehses, Daniel Brenner, Alard Roebroeck, Bernd Weber, Tony Stöcker
PURPOSE: The aim of this project was to implement an ultra-high field (UHF) optimized double inversion recovery (DIR) sequence for gray matter (GM) imaging, enabling whole brain coverage in short acquisition times ( ≈5 min, image resolution 1 mm(3) ). METHODS: A 3D variable flip angle DIR turbo spin echo (TSE) sequence was optimized for UHF application. We implemented an improved, fast, and specific absorption rate (SAR) efficient TSE imaging module, utilizing improved reordering...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28899968/multi-spectral-optoacoustic-tomography-msot-of-human-breast-cancer
#14
Gael Diot, Stephan Metz, Aurelia Noske, Evangelos Liapis, Barbara Schroeder, Saak Victor Ovsepian, Reinhard Meier, Ernst J Rummeny, Vasilis Ntziachristos
PURPOSE: In a pilot study, we introduce fast handheld Multi-Spectral Optoacoustic Tomography (MSOT) of the breast at 28 wavelengths, aiming to identify high-resolution optoacoustic (photoacoustic) patterns of breast cancer and non-cancerous breast tissue. EXPERIMENTAL DESIGN: We imaged 10 female patients aged 48-81 years with malignant non-specific breast cancer or invasive lobular carcinoma. Three healthy volunteers aged 31-36 years were also imaged. Fast-MSOT was based on unique single-frame-per-pulse (SFPP) image acquisition employed to improve the accuracy of spectral differentiation over using a small number of wavelengths...
September 12, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28895045/influence-of-gd-eob-dtpa-on-proton-density-fat-fraction-using-the-six-echo-dixon-method-in-3-tesla-magnetic-resonance-imaging
#15
Tatsuya Hayashi, Kei Fukuzawa, Hiroshi Kondo, Hiroshi Onodera, Shuji Toyotaka, Rie Tojo, Shimpei Yano, Masakatsu Tano, Tosiaki Miyati, Jun'ichi Kotoku, Takahide Okamoto, Keiko Toyoda, Hiroshi Oba
The purpose of this study was to evaluate whether disodium gadoxetate (Gd-EOB-DTPA) affects proton density fat fractions (PDFFs) during use of the multiecho Dixon (meDixon) method in phantom and simulation magnetic resonance imaging (MRI) studies at 3 T. Fat-water phantoms comprising vegetable fat-water emulsions with varying fat volume percentages (0, 5, 10, 15, 20, 30, 40, and 50) and Gd-EOB-DTPA concentrations (0 and 0.4 mM) were prepared. Phantoms without Gd-EOB-DTPA were defined as precontrast, and those with Gd-EOB-DTPA were defined as postcontrast...
September 11, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28887274/the-qualitative-grading-of-muscle-fat-infiltration-in-whiplash-using-fat-water-magnetic-resonance-imaging
#16
Rebecca Abbott, Anneli Peolsson, Janne West, James M Elliott, Ulrika Åslund, Anette Karlsson, Olof Dahlqvist Leinhard
BACKGROUND CONTEXT: Development of muscle fat infiltration (MFI) in the neck muscles is associated with poor functional recovery following whiplash injury. Custom software and time-consuming manual segmentation of magnetic resonance (MR) images is required for quantitative analysis and presents as a barrier for clinical translation. PURPOSE: The purpose of this work was to establish a qualitative MR measure for MFI and evaluate its ability to differentiate between individuals with severe whiplash-associated disorder (WAD), mild/moderate WAD, and healthy controls...
September 5, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28856717/filling-the-dead-time-gap-in-zero-echo-time-mri-principles-compared
#17
Romain Froidevaux, Markus Weiger, David O Brunner, Benjamin E Dietrich, Bertram J Wilm, Klaas P Pruessmann
PURPOSE: MRI of tissues with short coherence lifetimes T2 or T2* can be performed efficiently using zero echo time (ZTE) techniques such as algebraic ZTE, pointwise encoding time reduction with radial acquisition (PETRA), and water- and fat-suppressed proton projection MRI (WASPI). They share the principal challenge of recovering data in central k-space missed due to an initial radiofrequency dead time. The purpose of this study was to compare the three techniques directly, with a particular focus on their behavior in the presence of ultra-short-lived spins...
August 30, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28846496/whole-body-imaging-of-tissue-specific-insulin-sensitivity-and-body-composition-by-using-an-integrated-pet-mr-system-a-feasibility-study
#18
Emil Johansson, Mark Lubberink, Kerstin Heurling, Jan W Eriksson, Stanko Skrtic, Håkan Ahlström, Joel Kullberg
Purpose To develop, evaluate, and demonstrate the feasibility of a whole-body protocol for simultaneous assessment of tissue-specific insulin-mediated fluorine 18 ((18)F) fluorodeoxyglucose (FDG) influx rates, tissue depots, and whole-body insulin sensitivity (referred to as the M value). Materials and Methods An integrated positron emission tomography (PET)/magnetic resonance (MR) imaging system combined with hyperinsulinemic euglycemic clamp (HEC) was used. Dynamic whole-body PET imaging was used to determine the insulin-mediated (18)F-FDG tissue influx rate (Ki) in the whole-body region by using the Patlak method...
August 25, 2017: Radiology
https://www.readbyqxmd.com/read/28840613/characterizing-and-eliminating-errors-in-enhancement-and-subtraction-artifacts-in-dynamic-contrast-enhanced-breast-mri-chemical-shift-artifact-of-the-third-kind
#19
Jamal J Derakhshan, Elizabeth S McDonald, Evan S Siegelman, Mitchell D Schnall, Felix W Wehrli
PURPOSE: To characterize errors in enhancement in breast dynamic contrast-enhanced (DCE) MRI studies as a function of echo time and determine the source of dark band artifacts in clinical subtraction images. METHODS: Computer simulations, oil and water substitute (methylene chloride), as well as an American College of Radiology quality control phantom were tested. Routine clinical DCE breast MRI study was bracketed with (accelerated) in-phase DCE acquisitions in five patients...
August 24, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28833514/tissue-oxygenation-mapping-by-combined-chemical-shift-and-t1-magnetic-resonance-imaging
#20
Florence Franconi, Laurent Lemaire, Hervé Saint-Jalmes, Patrick Saulnier
PURPOSE: To propose a method for determining tissue oxygenation via the measurement of fat T1 . The method is based on a 2D fat/water chemical shift-encoded and T1 -weighted acquisition. THEORY AND METHODS: A 2D data set was acquired with a fast spin echo sequence with several echo asymmetries and repetition times, wherein one dimension is related to the fat/water phase modulation and the other to the T1 saturation recovery. A joint magnitude-based process of phase modulation and T1 evolution allowed for the collection of the fat fraction and T1 maps with resolved fat or water dominance ambiguity while avoiding the phased error problem...
August 21, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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