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Water Fat MRI

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https://www.readbyqxmd.com/read/29140420/growth-trajectories-breast-size-and-breast-tissue-composition-in-a-british-pre-birth-cohort-of-young-women
#1
Rachel Denholm, Bianca De Stavola, John H Hipwell, Simon J Doran, Marta C Busana, Martin O Leach, David J Hawkes, Isabel Dos-Santos-Silva
Mammographic % density, the proportion of fibroglandular tissue in the breast, is a strong risk factor for breast cancer, but its determinants in young women are unknown. We examined associations between magnetic resonance imaging (MRI) breast-tissue composition at age 21 years and prospectively-collected measures of body size and composition from birth to early adulthood, and markers of puberty (all standardized), in a sample of 500 nulliparous women from a pre-birth cohort of children born in Avon, England, in 1991-1992 and followed up to 2011-2014...
November 13, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/29134673/modified-dixon-based-renal-dynamic-contrast-enhanced-mri-facilitates-automated-registration-and-perfusion-analysis
#2
Anneloes de Boer, Tim Leiner, Eva E Vink, Peter J Blankestijn, Cornelis A T van den Berg
PURPOSE: Renal dynamic contrast-enhanced (DCE) MRI provides information on renal perfusion and filtration. However, clinical implementation is hampered by challenges in postprocessing as a result of misalignment of the kidneys due to respiration. We propose to perform automated image registration using the fat-only images derived from a modified Dixon reconstruction of a dual-echo acquisition because these provide consistent contrast over the dynamic series. METHODS: DCE data of 10 hypertensive patients was used...
November 13, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29130901/quantification-of-fat-fraction-in-lumbar-vertebrae-correlation-with-age-and-implications-for-bone-marrow-dosimetry-in-molecular-radiotherapy
#3
Maikol Salas-Ramirez, Johannes Tran-Gia, Christian Kesenheimer, Andreas Max Weng, Aleksander Kosmala, Anke Heidemeier, Herbert Koestler, Michael Lassmann
Absorbed dose to active bone marrow is a predictor of hematological toxicity in molecular radiotherapy. Due to the complex composition of bone marrow tissue, the necessity to improve the personalized dosimetry has led to the application of non-conventional imaging methods in nuclear medicine. The aim of this study is to apply magnetic resonance imaging (MRI) for quantification of the fat fraction in lumbar vertebrae and to analyze its implications for bone marrow dosimetry. Methods First, a highly accelerated two-point Dixon MRI sequence for fat-water separation was validated in a 3T system against the magnetic resonance spectroscopy (MRS) gold standard...
November 13, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29130539/sources-of-systematic-error-in-proton-density-fat-fraction-pdff-quantification-in-the-liver-evaluated-from-magnitude-images-with-different-numbers-of-echoes
#4
Mark Bydder, Gavin Hamilton, Ludovic de Rochefort, Ajinkya Desai, Elhamy R Heba, Rohit Loomba, Jeffrey B Schwimmer, Nikolaus M Szeverenyi, Claude B Sirlin
The purpose of this work was to investigate sources of bias in magnetic resonance imaging (MRI) liver fat quantification that lead to a dependence of the proton density fat fraction (PDFF) on the number of echoes. This was a retrospective analysis of liver MRI data from 463 subjects. The magnitude signal variation with TE from spoiled gradient echo images was curve fitted to estimate the PDFF using a model that included monoexponential R2 * decay and a multi-peak fat spectrum. Additional corrections for non-exponential decay (Gaussian), bi-exponential decay, degree of fat saturation, water frequency shift and noise bias were introduced...
November 12, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/29103469/improved-clinical-workflow-for-simultaneous-whole-body-pet-mri-using-high-resolution-caipirinha-accelerated-mr-based-attenuation-correction
#5
Martin T Freitag, Matthias Fenchel, Philipp Bäumer, Thorsten Heußer, Christopher M Rank, Marc Kachelrieß, Daniel Paech, Klaus Kopka, Sebastian Bickelhaupt, Antonia Dimitrakopoulou-Strauss, Klaus Maier-Hein, Ralf Floca, Mark E Ladd, Heinz-Peter Schlemmer, Florian Maier
PURPOSE: To explore the value and reproducibility of a novel magnetic resonance based attenuation correction (MRAC) using a CAIPIRINHA-accelerated T1-weighted Dixon 3D-VIBE sequence for whole-body PET/MRI compared to the clinical standard. METHODS: The PET raw data of 19 patients from clinical routine were reconstructed with standard MRAC (MRACstd) and the novel MRAC (MRACcaipi), a prototype CAIPIRINHA accelerated Dixon 3D-VIBE sequence, both acquired in 19 s/bed position...
November 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/29091003/american-college-of-radiology-compliant-short-protocol-breast-mri-for-high-risk-breast-cancer-screening-a-prospective-feasibility-study
#6
Basak E Dogan, Marion E Scoggins, Jong Bum Son, Wei Wei, Rosalind Candelaria, Wei T Yang, Jingfei Ma
OBJECTIVE: The purpose of this study was to assess the feasibility of a short protocol for screening breast MRI that is noninferior to standard-of-care (SOC) MRI in image quality that complies with American College of Radiology accreditation requirements. SUBJECTS AND METHODS: In a prospective feasibility trial, 23 women at high risk underwent both an initial SOC MRI examination that included axial iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) and T1-weighted volume imaging for breast assessment (VIBRANT) dynamic contrast-enhanced sequences and a separate short breast MRI protocol comprising a fast spin-echo (FSE) triple-echo Dixon T2 sequence for T2-weighted imaging and a 3D dual-echo fast spoiled gradient-echo two-point Dixon sequence for dynamic contrast-enhanced imaging from October 1, 2015, through May 2, 2016...
November 1, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29083521/peripheral-nerve-diffusion-tensor-imaging-overview-pitfalls-and-future-directions
#7
Tina Jeon, Maggie M Fung, Kevin M Koch, Ek T Tan, Darryl B Sneag
Diffusion tensor imaging (DTI) is a noninvasive magnetic resonance imaging (MRI) technique that measures the extent of restricted water diffusion and anisotropy in biological tissue. Although DTI has been widely applied in the brain, more recently researchers have used it to characterize nerve pathology in the setting of entrapment neuropathy, traumatic injury, and tumor. DTI artifacts are exacerbated when imaging off isocenter in the body. Anecdotally, the most significant artifacts in peripheral nerve DTI include magnetic field inhomogeneity, motion, incomplete fat suppression, aliasing, and distortion...
October 30, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29082217/the-optimization-of-magnetic-resonance-imaging-pulse-sequences-in-order-to-better-detection-of-multiple-sclerosis-plaques
#8
Z Farshidfar, F Faeghi, H R Haghighatkhah, J Abdolmohammadi
BACKGROUND AND OBJECTIVE: Magnetic resonance imaging (MRI) is the most sensitive technique to detect multiple sclerosis (MS) plaques in central nervous system. In some cases, the patients who were suspected to MS, Whereas MRI images are normal, but whether patients don't have MS plaques or MRI images are not enough optimized enough in order to show MS plaques? The aim of the current study is evaluating the efficiency of different MRI sequences in order to better detection of MS plaques...
September 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/29017799/automated-segmentation-of-abdominal-subcutaneous-adipose-tissue-and-visceral-adipose-tissue-in-obese-adolescent-in-mri
#9
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/28982632/a-data-oriented-self-calibration-and-robust-chemical-shift-encoding-by-using-clusterization-oscar-theory-optimization-and-clinical-validation-in-neuromuscular-disorders
#10
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
#11
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/28956970/lymphedema-leads-to-fat-deposition-in-muscle-and-decreased-muscle-water-volume-after-liposuction-a-magnetic-resonance-imaging-study
#12
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
#13
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
#14
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
#15
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/28905516/simple-method-for-rf-pulse-measurement-using-gradient-reversal
#16
Vanessa L Landes, Krishna S Nayak
PURPOSE: To develop and evaluate a simple method for measuring the envelope of small-tip radiofrequency (RF) excitation waveforms in MRI, without extra hardware or synchronization. THEORY AND METHODS: Gradient reversal approach to evaluate RF (GRATER) involves RF excitation with a constant gradient and reversal of that gradient during signal reception to acquire the time-reversed version of an RF envelope. An outer-volume suppression prepulse is used optionally to preselect a uniform volume...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28899968/multispectral-optoacoustic-tomography-msot-of-human-breast-cancer
#17
Gael Diot, Stephan Metz, Aurelia Noske, Evangelos Liapis, Barbara Schroeder, Saak V Ovsepian, Reinhard Meier, Ernst Rummeny, Vasilis Ntziachristos
Purpose: In a pilot study, we introduce fast handheld multispectral optoacoustic tomography (MSOT) of the breast at 28 wavelengths, aiming to identify high-resolution optoacoustic (photoacoustic) patterns of breast cancer and noncancerous breast tissue.Experimental Design: We imaged 10 female patients ages 48-81 years with malignant nonspecific breast cancer or invasive lobular carcinoma. Three healthy volunteers ages 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
#18
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/28856717/filling-the-dead-time-gap-in-zero-echo-time-mri-principles-compared
#19
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/28840613/characterizing-and-eliminating-errors-in-enhancement-and-subtraction-artifacts-in-dynamic-contrast-enhanced-breast-mri-chemical-shift-artifact-of-the-third-kind
#20
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
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