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Journal of Magnetic Resonance Imaging: JMRI

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https://www.readbyqxmd.com/read/28513892/assessment-of-nonarteritic-anterior-ischemic-optic-neuropathy-with-intravoxel-incoherent-motion-diffusion-weighted-imaging-using-readout-segmented-echo-planar-imaging-parallel-imaging-and-2d-navigator-based-reacquisition
#1
Ping Lu, Yan Sha, Hailin Wan, Feng Wang, Guohong Tan, Wenlin Tang
PURPOSE: To determine the feasibility of intravoxel incoherent motion (IVIM) for characterizing perfusion properties and its potential diagnostic utility for nonarteritic anterior ischemic optic neuropathy (NAION). IVIM diffusion-weighted imaging is a promising technique that can measure perfusion and diffusion characteristics simultaneously in a noninvasive manner. MATERIALS AND METHODS: Orbital IVIM in a 3.0T scanner was performed on 33 patients with NAION and 15 controls using readout-segmented echo-planar imaging, parallel imaging, and 2D navigator-based reacquisition (RESOLVE-IVIM)...
May 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28503732/imaging-short-lived-reactive-oxygen-species-ros-with-endogenous-contrast-mri
#2
Rong-Wen Tain, Alessandro M Scotti, Weiguo Li, Xiaohong Joe Zhou, Kejia Cai
PURPOSE: To characterize the relaxation properties of reactive oxygen species (ROS) for the development of endogenous ROS contrast magnetic resonance imaging (MRI). MATERIALS AND METHODS: ROS-producing phantoms and animal models were imaged at 9.4T MRI to obtain T1 and T2 maps. Egg white samples treated with varied concentrations of hydrogen peroxide (H2 O2 ) were used to evaluate the effect of produced ROS in T1 and T2 for up to 4 hours. pH and temperature changes due to H2 O2 treatment in egg white were also monitored...
May 15, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28493526/real-time-mri-guidance-of-cardiac-interventions
#3
Adrienne E Campbell-Washburn, Mohammad A Tavallaei, Mihaela Pop, Elena K Grant, Henry Chubb, Kawal Rhode, Graham A Wright
Cardiac magnetic resonance imaging (MRI) is appealing to guide complex cardiac procedures because it is ionizing radiation-free and offers flexible soft-tissue contrast. Interventional cardiac MR promises to improve existing procedures and enable new ones for complex arrhythmias, as well as congenital and structural heart disease. Guiding invasive procedures demands faster image acquisition, reconstruction and analysis, as well as intuitive intraprocedural display of imaging data. Standard cardiac MR techniques such as 3D anatomical imaging, cardiac function and flow, parameter mapping, and late-gadolinium enhancement can be used to gather valuable clinical data at various procedural stages...
May 11, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28489309/isotropic-three-dimensional-t2-mapping-of-knee-cartilage-development-and-validation
#4
Roberto Colotti, Patrick Omoumi, Gabriele Bonanno, Jean-Baptiste Ledoux, Ruud B van Heeswijk
PURPOSE: 1) To implement a higher-resolution isotropic 3D T2 mapping technique that uses sequential T2 -prepared segmented gradient-recalled echo (Iso3DGRE) images for knee cartilage evaluation, and 2) to validate it both in vitro and in vivo in healthy volunteers and patients with knee osteoarthritis. MATERIALS AND METHODS: The Iso3DGRE sequence with an isotropic 0.6 mm spatial resolution was developed on a clinical 3T MR scanner. Numerical simulations were performed to optimize the pulse sequence parameters...
May 10, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28488348/pulmonary-artery-stiffness-in-chronic-obstructive-pulmonary-disease-copd-and-emphysema-the-multi-ethnic-study-of-atherosclerosis-mesa-copd-study
#5
Chia-Ying Liu, Megha Parikh, David A Bluemke, Pallavi Balte, James Carr, Stephen Dashnaw, Hooman D Poor, Antoinette S Gomes, Eric A Hoffman, Steven M Kawut, Joao A C Lima, David A McAllister, Martin A Prince, Jens Vogel-Claussen, R Graham Barr
PURPOSE: Chronic obstructive pulmonary disease (COPD) and particularly emphysema are characterized by stiffness of the aorta, due in part to accelerated elastin degradation in the lungs and aorta. Stiffness of the pulmonary arteries (PAs) may also be increased in COPD and emphysema, but data are lacking. We assessed PA stiffness using MRI in patients with COPD and related these measurements to COPD severity and percent emphysema. MATERIALS AND METHODS: The Multi-Ethnic Study of Atherosclerosis (MESA) COPD Study recruited 290 participants, age 50-79 years with 10 or more packyears and free of clinical cardiovascular disease...
May 10, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28485034/quantitative-t2-relaxation-time-analysis-of-articular-cartilage-of-the-tibiotalar-joint-in-professional-football-players-and-healthy-volunteers-at-3t-mri
#6
Cyrus Behzadi, Kai-Jonathan Maas, Goetz Welsch, Michael Kaul, Gerhard Schoen, Azien Laqmani, Gerhard Adam, Marc Regier
PURPOSE: To compare T2 * relaxation times of the tibiotalar cartilage between professional football players and matched healthy male volunteers. MATERIALS AND METHODS: Twenty-two ankles of professional football players (24.3 ± 3.8 years) and 20 age- and body mass index-matched healthy individuals (25.6 ± 2.4 years) were investigated. The study protocol consisted of multiplanar T1 -weighted, fat-saturated proton-density weighted (Pdw) and a 3D multiecho T2 * sequence with 22 echo times (4...
May 9, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28480619/rapid-and-simultaneous-measurement-of-phosphorus-metabolite-pool-size-ratio-and-reaction-kinetics-of-enzymes-in-vivo
#7
Sang-Young Kim, Wei Chen, Dost Ongur, Fei Du
PURPOSE: The metabolites phosphocreatine (PCr), adenosine triphosphate (ATP), and in-organic phosphate (Pi) are biochemically coupled. Their pool sizes, assessed by their magnetization ratios, have been extensively studied and reflect bioenergetics status in vivo. However, most such studies have ignored chemical exchange and T1 relaxation effects. In this work, we aimed to extend the T1nom method to simultaneously quantify the reaction rate constants as well as phosphorus metabolite pool size ratios under partially relaxed conditions...
May 8, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28480617/comparison-of-arterial-spin-labeling-registration-strategies-in-the-multi-center-genetic-frontotemporal-dementia-initiative-genfi
#8
Henri J M M Mutsaerts, Jan Petr, David L Thomas, Enrico de Vita, David M Cash, Matthias J P van Osch, Xavier Golay, Paul F C Groot, Sebastien Ourselin, John van Swieten, Robert Laforce, Fabrizio Tagliavini, Barbara Borroni, Daniela Galimberti, James B Rowe, Caroline Graff, Francesca B Pizzini, Elizabeth Finger, Sandro Sorbi, Miguel Castelo Branco, Jonathan D Rohrer, Mario Masellis, Bradley J MacIntosh
PURPOSE: To compare registration strategies to align arterial spin labeling (ASL) with 3D T1-weighted (T1w) images, with the goal of reducing the between-subject variability of cerebral blood flow (CBF) images. MATERIALS AND METHODS: Multi-center 3T ASL data were collected at eight sites with four different sequences in the multi-center GENetic Frontotemporal dementia Initiative (GENFI) study. In a total of 48 healthy controls, we compared the following image registration options: (I) which images to use for registration (perfusion-weighted images [PWI] to the segmented gray matter (GM) probability map (pGM) (CBF-pGM) or M0 to T1w (M0-T1w); (II) which transformation to use (rigid-body or non-rigid); and (III) whether to mask or not (no masking, M0-based FMRIB software library Brain Extraction Tool [BET] masking)...
May 8, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28480609/pancreatic-neuroendocrine-tumor-correlations-between-mri-features-tumor-biology-and-clinical-outcome-after-surgery
#9
Rodrigo Canellas, Grace Lo, Sreejita Bhowmik, Cristina Ferrone, Dushyant Sahani
PURPOSE: To assess which magnetic resonance imaging (MRI) features are associated with pNETs (pancreatic neuroendocrine tumors) grade based on the WHO classification, as well as identify MRI features related to disease progression after surgery. MATERIALS AND METHODS: In this Institutional Review Board (IRB)-approved study, 1.5T and 3.0T MRI scans of 80 patients with surgically verified pNETs were assessed. The images were evaluated for tumor location; size; pattern; predominant signal intensity on precontrast T1 - and T2 -weighted images, as well as on postcontrast arterial and portal venous phase T1 -weighted sequences; presence of pancreatic duct dilatation; pancreatic atrophy; restricted diffusion; vascular involvement by the tumor; extrapancreatic tumor spread; and synchronous liver metastases...
May 8, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28480596/when-should-we-use-contrast-material-in-cardiac-mri
#10
REVIEW
Elisabeth H M Paiman, Hildo J Lamb
At present, most of the cardiac magnetic resonance imaging (MRI) examinations rely on contrast-enhanced protocols, but noncontrast alternatives are emerging. Late gadolinium enhancement (LGE) imaging for the detection of myocardial scar can be considered the main cause for the embedding of cardiac MRI into the clinical routine. The novel noncontrast technique of native T1 mapping shows promise for tissue characterization in ischemic and nonischemic cardiomyopathy and may provide additional information over conventional LGE imaging...
May 8, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28480541/response-assessment-of-stereotactic-body-radiation-therapy-using-dynamic-contrast-enhanced-integrated-mr-pet-in-non-small-cell-lung-cancer-patients
#11
Yu-Sen Huang, Jenny Ling-Yu Chen, Feng-Ming Hsu, Jei-Yie Huang, Wei-Chun Ko, Yi-Chang Chen, Fu-Shan Jaw, Ruoh-Fang Yen, Yeun-Chung Chang
PURPOSE: To evaluate the response in patients undergoing SBRT using dynamic contrast-enhanced (DCE) integrated magnetic resonance positron emission tomography (MR-PET). Stereotactic body radiation therapy (SBRT) is efficacious as a front-line local treatment for non-small cell lung cancer (NSCLC). MATERIALS AND METHODS: We prospectively enrolled 19 lung tumors in 17 nonmetastatic NSCLC patients who were receiving SBRT as a primary treatment. They underwent DCE-integrated 3T MR-PET before and 6 weeks after SBRT...
May 8, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28471543/mri-and-biomechanics-multidimensional-data-analysis-reveals-r2-r1%C3%AF-as-an-early-predictor-of-cartilage-lesion-progression-in-knee-osteoarthritis
#12
Valentina Pedoia, Jenny Haefeli, Kazuhito Morioka, Hsiang-Ling Teng, Lorenzo Nardo, Richard B Souza, Adam R Ferguson, Sharmila Majumdar
PURPOSE: To couple quantitative compositional MRI, gait analysis, and machine learning multidimensional data analysis to study osteoarthritis (OA). OA is a multifactorial disorder accompanied by biochemical and morphological changes in the articular cartilage, modulated by skeletal biomechanics and gait. While we can now acquire detailed information about the knee joint structure and function, we are not yet able to leverage the multifactorial factors for diagnosis and disease management of knee OA...
May 4, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28471530/magnetic-resonance-imaging-of-myocardial-strain-a-review-of-current-approaches
#13
Teodora Chitiboi, Leon Axel
Contraction of the heart is central to its purpose of pumping blood around the body. While simple global function measures (such as the ejection fraction) are most commonly used in the clinical assessment of cardiac function, MRI also provides a range of approaches for quantitatively characterizing regional cardiac function, including the local deformation (or strain) within the heart wall. While they have been around for some years, these methods are still undergoing further technical development, and they have had relatively little clinical evaluation...
May 4, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28471524/non-gaussian-diffusion-evaluation-of-the-human-kidney-by-pad%C3%A3-exponent-model
#14
Alexandra Ljimani, Rotem S Lanzman, Anja Müller-Lutz, Gerald Antoch, Hans-Jörg Wittsack
PURPOSE: To evaluate the feasibility of renal diffusion quantification using the Padé exponent model (PEM) in healthy subjects. MATERIALS AND METHODS: Diffusion measurements were completed in 10 healthy subjects (mean age, 32.4 ± 8.9 years) on a 3T MRI scanner (Magnetom Trio, Siemens AG, Germany). A respiratory-triggered echo planar imaging sequence (15 slices with 6 mm thickness; 16 b-values [0-750 s/mm(2) ]; three diffusion directions; field of view: 400 × 375 mm; Matrix 192 × 192; repetition time/echo time: 3000/74 ms) was acquired in the coronal direction...
May 4, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28471511/whole-volume-apparent-diffusion-coefficient-based-entropy-parameters-for-assessment-of-gastric-cancer-aggressiveness
#15
Song Liu, Huanhuan Zheng, Yujuan Zhang, Ling Chen, Wenxian Guan, Yue Guan, Yun Ge, Jian He, Zhengyang Zhou
PURPOSE: To explore the role of whole-volume apparent diffusion coefficient (ADC)-based entropy parameters in the preoperative assessment of gastric cancer's aggressiveness. MATERIALS AND METHODS: In all, 64 patients with gastric cancers who underwent 3.0T magnetic resonance imaging (MRI) were retrospectively included. Regions of interest were drawn manually using in-house software, around gastric cancer lesions on each slice of the diffusion-weighted images and ADC maps...
May 4, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28470915/comparison-of-fast-acquisition-strategies-in-whole-heart-four-dimensional-flow-cardiac-mr-two-center-1-5-tesla-phantom-and-in-vivo-validation-study
#16
Pankaj Garg, Jos J M Westenberg, Pieter J van den Boogaard, Peter P Swoboda, Rahoz Aziz, James R J Foley, Graham J Fent, F G J Tyl, L Coratella, Mohammed S M ElBaz, R J van der Geest, David M Higgins, John P Greenwood, Sven Plein
PURPOSE: To validate three widely-used acceleration methods in four-dimensional (4D) flow cardiac MR; segmented 4D-spoiled-gradient-echo (4D-SPGR), 4D-echo-planar-imaging (4D-EPI), and 4D-k-t Broad-use Linear Acquisition Speed-up Technique (4D-k-t BLAST). MATERIALS AND METHODS: Acceleration methods were investigated in static/pulsatile phantoms and 25 volunteers on 1.5 Tesla MR systems. In phantoms, flow was quantified by 2D phase-contrast (PC), the three 4D flow methods and the time-beaker flow measurements...
May 4, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28470774/incidental-findings-in-research-a-focus-group-study-about-the-perspective-of-the-research-participant
#17
Anna W de Boer, Yvonne M Drewes, Renée de Mutsert, Mattijs E Numans, Martin den Heijer, Olaf M Dekkers, Albert de Roos, Hildo J Lamb, Jeanet W Blom, Ria Reis
PURPOSE: To explore the experiences and preferences of population-based research participants to whom an incidental finding was communicated. MATERIALS AND METHODS: Of the 2580 participants of the Netherlands Epidemiology of Obesity (NEO) study who underwent magnetic resonance imaging (MRI) scanning of the abdomen, heart, and/or brain, an incidental finding with presumed health importance was disclosed to 56 (2%) participants. These participants were invited to discuss their experiences regarding the communication of the finding by the NEO research team in a focus group discussion...
May 4, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28470744/mri-guided-breast-interventions
#18
Anika L McGrath, Elissa R Price, Peter R Eby, Habib Rahbar
Magnetic resonance imaging (MRI)-guided interventions, including biopsies and wire localizations, are fundamental to any breast imaging practice due to the high sensitivity but limited specificity of breast MRI. The basic steps of MRI-guided biopsies are similar regardless of the vendor or platform, and technical considerations include approach planning, patient preparation and positioning, lesion targeting, and directional sampling using a vacuum-assisted biopsy technique. Unique challenges related to MRI-guided biopsies include vanishing lesions due to contrast washout, obscuration of the biopsy site due to susceptibility artifacts, and limited access to posteromedial lesions...
May 4, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28464380/noninvasive-imaging-in-cardiac-deposition-diseases
#19
REVIEW
Ranjit Shah, Gaetano Nucifora, Rebecca Perry, Joseph B Selvanayagam
Infiltrative cardiomyopathy represents a heterogeneous group of diseases of the heart tissue with similar phenotypic expression. The condition is rare, but can be easily mistaken for other more common conditions of the heart. The diagnosis of infiltrative cardiomyopathy is therefore challenging and has often required the use of invasive procedures in the past. In the last decade there have been great advances in non-invasive cardiac imaging modalities like echocardiography, cardiovascular magnetic resonance and nuclear imaging...
May 2, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28449249/t2-mapping-evaluation-of-early-cartilage-alteration-of-talus-for-chronic-lateral-ankle-instability-with-isolated-anterior-talofibular-ligament-tear-or-combined-with-calcaneofibular-ligament-tear
#20
Hongyue Tao, Yiwen Hu, Yang Qiao, Kui Ma, Xu Yan, Yinghui Hua, Shuang Chen
PURPOSE: To quantitatively evaluate the cartilage alteration of talus for chronic lateral ankle instability (LAI) with isolated anterior talofibular ligament (ATFL) tear and combined ATFL and calcaneofibular ligament (CFL) tear using T2 -mapping at 3.0T. MATERIALS AND METHODS: In all, 27 patients including 17 with isolated ATFL tear and 10 with ATFL+CFL tear, and 21 healthy subjects were recruited. All participants underwent T2 -mapping scan at 3T and patients completed American Orthopaedic Foot and Ankle Society (AOFAS) scoring...
April 27, 2017: Journal of Magnetic Resonance Imaging: JMRI
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