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Journal of Magnetic Resonance Imaging: JMRI

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https://www.readbyqxmd.com/read/27902865/small-world-properties-changes-in-mild-traumatic-brain-injury
#1
Yongxia Zhou
PURPOSE: To investigate local and global efficiency changes characterized by small-world properties based on resting-state functional MRI, such as centrality and clustering coefficient, in mild traumatic brain injury (MTBI) patients; and to associate these findings with axonal injury as measured by diffusion tensor imaging (DTI) as well as with post-concussive symptom (PCS). MATERIALS AND METHODS: Thirty patients (mean age 35 ± 13 years) with clinically defined MTBI and 45 age-matched healthy controls (mean age 37 ± 10 years) participated in the experiments...
November 30, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27902863/evaluation-of-recurrent-high-grade-gliomas-treated-with-bevacizumab-a-preliminary-report-of-3d-pseudocontinuous-artery-spin-labeling
#2
Yuelei Lyu, Shuai Liu, Hui You, Bo Hou, Yu Wang, Wenbin Ma, Feng Feng
PURPOSE: To investigate the role of cerebral blood flow (CBF) derived from a 3D fast spin echo (FSE) pseudocontinuous artery spin labeling (pcASL) sequence in evaluating the survival rate of recurrent high-grade gliomas (rHGGs) that were treated with bevacizumab (BEV). MATERIALS AND METHODS: Sixteen patients with rHGGs who underwent 3T 3D FSE pcASL imaging 1-2 days before (baseline or pre-BEV) and within 1 month after BEV treatment initiation (post-BEV) were included in the study...
November 30, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27902859/evaluation-of-velocity-sensitized-and-acceleration-sensitized-nce-mra-for-below-knee-peripheral-arterial-disease
#3
Nadeem Shaida, Andrew N Priest, T C See, Andrew P Winterbottom, Martin J Graves, David J Lomas
PURPOSE: To evaluate the diagnostic performance of velocity- and acceleration-sensitized noncontrast-enhanced magnetic resonance angiography (NCE-MRA) of the infrageniculate arteries using contrast-enhanced MRA (CE-MRA) as a reference standard. MATERIALS AND METHODS: Twenty-four patients with symptoms of peripheral arterial disease were recruited. Each patient's infrageniculate arterial tree was examined using a velocity-dependent flow-sensitized dephasing (VEL-FSD) technique, an acceleration-dependent (ACC-FSD) technique, and our conventional CE-MRA technique performed at 1...
November 30, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27902858/reliable-estimation-of-microvascular-flow-patterns-in-patients-with-disrupted-blood-brain-barrier-using-dynamic-susceptibility-contrast-mri
#4
Mikkel Bo Hansen, Anna Tietze, Jayashree Kalpathy-Cramer, Elizabeth R Gerstner, Tracy T Batchelor, Leif Østergaard, Kim Mouridsen
PURPOSE: To present and quantify the performance of a method to compute tissue hemodynamic parameters from dynamic susceptibility contrast (DSC) MRI data in brain tissue with possible nonintact blood-brain barrier. THEORY AND MATERIALS AND METHODS: We propose a Bayesian scheme to obtain perfusion metrics, including capillary transit-time heterogeneity (CTH), from DSC-MRI data in the presence of contrast agent extravasation. Initial performance assessment is performed through simulations...
November 30, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27902857/quantitative-assessment-of-hyperacute-cerebral-infarction-with-intravoxel-incoherent-motion-mr-imaging-initial-experience-in-a-canine-stroke-model
#5
Qian-Qian Gao, Shan-Shan Lu, Xiao-Quan Xu, Cheng-Jiang Wu, Xing-Long Liu, Sheng Liu, Hai-Bin Shi
PURPOSE: To evaluate the feasibility of intravoxel incoherent motion (IVIM) for the measurement of diffusion and perfusion parameters in hyperacute strokes. MATERIALS AND METHODS: An embolic ischemic model was established with an autologous thrombus in 20 beagles. IVIM imaging was performed on a 3.0 Tesla platform at 4.5 h and 6 h after embolization. Ten b values from 0 to 900 s/mm(2) were fitted with a bi-exponential model to extract perfusion fraction f, diffusion coefficient D, and pseudo-diffusion coefficient D*...
November 30, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27880010/abnormal-baseline-brain-activity-in-parkinson-s-disease-with-and-without-rem-sleep-behavior-disorder-a-resting-state-functional-mri-study
#6
Dan Li, Peiyu Huang, Yufeng Zang, Yuting Lou, Zhidong Cen, Quanquan Gu, Min Xuan, Fei Xie, Zhiyuan Ouyang, Bo Wang, Minming Zhang, Wei Luo
PURPOSE: To investigate the differences in spontaneous brain activity between Parkinson's disease (PD) patients with rapid eye movement sleep behavior disorder (RBD), PD patients without RBD, and normal controls, which may shed new light on the neural mechanism of RBD. MATERIALS AND METHODS: Eighteen PD patients with RBD, 16 patients without RBD, and 19 age- and gender-matched normal controls underwent clinical assessment and functional magnetic resonance imaging (fMRI) with a 3...
November 23, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27875009/3d-printing-from-mri-data-harnessing-strengths-and-minimizing-weaknesses
#7
Beth Ripley, Dmitry Levin, Tatiana Kelil, Joshua L Hermsen, Sooah Kim, Jeffrey H Maki, Gregory J Wilson
: 3D printing facilitates the creation of accurate physical models of patient-specific anatomy from medical imaging datasets. While the majority of models to date are created from computed tomography (CT) data, there is increasing interest in creating models from other datasets, such as ultrasound and magnetic resonance imaging (MRI). MRI, in particular, holds great potential for 3D printing, given its excellent tissue characterization and lack of ionizing radiation. There are, however, challenges to 3D printing from MRI data as well...
November 22, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27875002/superparamagnetic-nanoparticle-enhanced-mri-of-alzheimer-s-disease-plaques-and-activated-microglia-in-3x-transgenic-mouse-brains-contrast-optimization
#8
Marissa A Tafoya, Saaussan Madi, Laurel O Sillerud
PURPOSE: To optimize magnetic resonance imaging (MRI) of antibody-conjugated superparamagnetic nanoparticles for detecting amyloid-β plaques and activated microglia in a 3X transgenic mouse model of Alzheimer's disease. MATERIALS AND METHODS: Ten 3X Tg mice were fed either chow or chow containing 100 ppm resveratrol. Four brains, selected from animals injected with either anti-amyloid targeted superparamagnetic iron oxide nanoparticles, or anti-Iba-1-conjugated FePt-nanoparticles, were excised, fixed with formalin, and placed in Fomblin for ex vivo MRI (11...
November 22, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27875000/combined-hepatocellular-cholangiocarcinoma-gadoxetic-acid-enhanced-mri-findings-correlated-with-pathologic-features-and-prognosis
#9
So Hyun Park, Seung Soo Lee, Eunsil Yu, Hyo Jeong Kang, Yangsoon Park, So Yeon Kim, So Jung Lee, Yong Moon Shin, Moon Gyu Lee
PURPOSE: To evaluate gadoxetic acid-enhanced magnetic resonance imaging (MRI) findings of combined hepatocellular cholangiocarcinoma (cHCC-CC) with special emphasis on correlation of MRI findings with histopathologic tumor characteristics and survival outcomes after curative surgery. MATERIALS AND METHODS: Our Institutional Review Board approved this study, with a waiver of informed consent. For 82 patients (64 men, 18 women; mean age, 54.0 years; age range, 30-81) with surgically confirmed cHCC-CCs, we evaluated clinical features, histologic findings, and tumor morphologic and enhancement features on gadoxetic acid-enhanced liver MRI at 1...
November 22, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27869333/patient-specific-3d-flair-for-enhanced-visualization-of-brain-white-matter-lesions-in-multiple-sclerosis
#10
Refaat E Gabr, Amol S Pednekar, Koushik A Govindarajan, Xiaojun Sun, Roy F Riascos, María G Ramírez, Khader M Hasan, John A Lincoln, Flavia Nelson, Jerry S Wolinsky, Ponnada A Narayana
PURPOSE: To improve the conspicuity of white matter lesions (WMLs) in multiple sclerosis (MS) using patient-specific optimization of single-slab 3D fluid-attenuated inversion recovery (FLAIR) magnetic resonance imaging (MRI). MATERIALS AND METHODS: Sixteen MS patients were enrolled in a prospective 3.0T MRI study. FLAIR inversion time and echo time were automatically optimized for each patient during the same scan session based on measurements of the relative proton density and relaxation times of the brain tissues...
November 21, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27859874/comparison-of-conventional-dce-mri-and-a-novel-golden-angle-radial-multicoil-compressed-sensing-method-for-the-evaluation-of-breast-lesion-conspicuity
#11
Laura Heacock, Yiming Gao, Samantha L Heller, Amy N Melsaether, James S Babb, Tobias K Block, Ricardo Otazo, Sungheon G Kim, Linda Moy
PURPOSE: To compare a novel multicoil compressed sensing technique with flexible temporal resolution, golden-angle radial sparse parallel (GRASP), to conventional fat-suppressed spoiled three-dimensional (3D) gradient-echo (volumetric interpolated breath-hold examination, VIBE) MRI in evaluating the conspicuity of benign and malignant breast lesions. MATERIALS AND METHODS: Between March and August 2015, 121 women (24-84 years; mean, 49.7 years) with 180 biopsy-proven benign and malignant lesions were imaged consecutively at 3...
November 17, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27865032/intravoxel-incoherent-motion-diffusion-weighted-mri-of-the-abdomen-the-effect-of-fitting-algorithms-on-the-accuracy-and-reliability-of-the-parameters
#12
Hyo Jung Park, Yu Sub Sung, Seung Soo Lee, Yedaun Lee, Hyunhee Cheong, Yeong Jae Kim, Moon-Gyu Lee
PURPOSE: To evaluate the influence of fitting methods on the accuracy and reliability of intravoxel incoherent motion (IVIM) parameters, with a particular emphasis on the constraint function. MATERIALS AND METHODS: Diffusion-weighted (DW) imaging data were analyzed using IVIM-based full-fitting (simultaneous fit of all parameters) and segmented-fitting (step-by-step fit of each parameter), each with and without the constraint function, to estimate the molecular diffusion coefficient (Dslow ), perfusion fraction (f), and flow-related diffusion coefficient (Dfast )...
November 16, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27865027/assessment-of-active-and-inactive-sacroiliitis-in-patients-with-ankylosing-spondylitis-using-quantitative-dynamic-contrast-enhanced-mri
#13
Mengchao Zhang, Le Zhou, Ning Huang, Hong Zeng, Songyan Liu, Lin Liu
PURPOSE: To investigate the feasibility of using quantitative dynamic contrast enhanced magnetic resonance imaging (DCE-MRI) to differentiate the active and inactive stage of sacroiliitis and the correlation between quantitative parameters and disease activity as measured by clinical scores. MATERIALS AND METHODS: Forty-two patients with ankylosing spondylitis underwent DCE-MRI on a 3.0T MRI unit. According to the results of the blood sedimentation rate (ESR), C-reactive protein (CRP), and Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), the patients were grouped into inactive and active groups...
November 16, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27865025/mr-targeted-imaging-for-the-expression-of-tenascin-c-in-myocardial-infarction-in-vivo
#14
Jiacheng Song, Jing Yu, Yan Li, Shanshan Lu, Zhanlong Ma, Haibin Shi
PURPOSE: To investigate the presence of viable myocardium in mice with acute myocardial infarction (MI) using a molecular targeted probe. MATERIALS AND METHODS: Super paramagnetic iron oxide (SPIO) nanoparticles and tenascin-C antibody were conjugated as an MRI probe. Fifteen mice with infarction were injected with SPIO-anti-tenascin-C (3 days [d], 5d, 7d after infarction; n = 5 for each group). Another five mice with infarction (5d, n = 5) were injected with SPIO for comparison...
November 16, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27859840/value-of-mr-elastography-for-the-preoperative-estimation-of-liver-regeneration-capacity-in-patients-with-hepatocellular-carcinoma
#15
Siwon Jang, Jeong Min Lee, Dong Ho Lee, Ijin Joo, Jeong Hee Yoon, Won Chang, Joon Koo Han
PURPOSE: To demonstrate the negative relationship between liver stiffness (LS) values measured at preoperative magnetic resonance elastography (MRE) and the regeneration capacity of the remnant liver after major hepatectomy, in patients with hepatocellular carcinoma (HCC). MATERIALS AND METHODS: Thirty-eight patients with HCC (mean age, 57.1) who had undergone liver computed tomography (CT) and 1.5T MRE prior to right hepatectomy were included in this retrospective study...
November 16, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27862554/characterization-of-calcification-in-constrictive-pericarditis-using-an-ultrashort-echo-time-sequence
#16
LETTER
Jérôme Peyrou, Marjorie Salel, Hubert Cochet, Valérie Latrabe, Olivier Corneloup, Michel Montaudon, François Laurent, Gaël Dournes, Jérôme Peyrou, Hubert Cochet, Laurent Barandon, Michel Montaudon, François Laurent, Gaël Dournes, Laurent Barandon
No abstract text is available yet for this article.
November 14, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27862553/intravoxel-incoherent-motion-diffusion-weighted-mri-during-chemoradiation-therapy-to-characterize-and-monitor-treatment-response-in-human-papillomavirus-head-and-neck-squamous-cell-carcinoma
#17
Ramesh Paudyal, Jung Hun Oh, Nadeem Riaz, Praveen Venigalla, Jingao Li, Vaios Hatzoglou, Jonathan Leeman, David Aramburu Nunez, Yonggang Lu, Joseph O Deasy, Nancy Lee, Amita Shukla-Dave
PURPOSE: Characterize and monitor treatment response in human papillomavirus (HPV) head and neck squamous cell carcinoma (HNSCC) using intra-treatment (intra-TX) imaging metrics derived from intravoxel incoherent motion (IVIM) diffusion-weighted magnetic resonance imaging (DW-MRI). MATERIALS AND METHODS: Thirty-four (30 HPV positive [+] and 4 HPV negative [-]) HNSCC patients underwent a total of 136 MRI including multi-b value DW-MRI (pretreatment [pre-TX] and intra-TX weeks 1, 2, and 3) at 3...
November 11, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27859983/imaging-of-nigrosome-1-in-substantia-nigra-at-3t-using-multiecho-susceptibility-map-weighted-imaging-smwi
#18
Yoonho Nam, Sung-Min Gho, Dong-Hyun Kim, Eung Yeop Kim, Jongho Lee
PURPOSE: To enhance the visibility of nigrosome 1 in substantia nigra, which has recently been suggested as an imaging biomarker for Parkinson's disease (PD) at 3T magnetic resonance imaging (MRI). MATERIALS AND METHODS: The substantia nigra structure was visualized at 3T MRI using multiecho susceptibility map-weighted imaging (SMWI) in 15 healthy volunteers and 6 patients with Parkinson's disease (PD). The visibility of nigrosome 1 was further enhanced by acquiring data in an oblique-coronal imaging plane at a high spatial resolution (0...
November 11, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27862582/whole-tumor-mri-histogram-analyses-of-hepatocellular-carcinoma-correlations-with-ki-67-labeling-index
#19
Xin-Xing Hu, Zhao-Xia Yang, He-Yue Liang, Ying Ding, Robert Grimm, Cai-Xia Fu, Hui Liu, Xu Yan, Yuan Ji, Meng-Su Zeng, Sheng-Xiang Rao
PURPOSE: To evaluate whether whole-tumor histogram-derived parameters for an apparent diffusion coefficient (ADC) map and contrast-enhanced magnetic resonance imaging (MRI) could aid in assessing Ki-67 labeling index (LI) of hepatocellular carcinoma (HCC). MATERIALS AND METHODS: In all, 57 patients with HCC who underwent pretreatment MRI with a 3T MR scanner were included retrospectively. Histogram parameters including mean, median, standard deviation, skewness, kurtosis, and percentiles (5(th) , 25(th) , 75(th) , 95(th) ) were derived from the ADC map and MR enhancement...
November 10, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27862577/crossover-comparison-of-ferumoxytol-and-gadobenate-dimeglumine-for-abdominal-mr-angiography-at-3-0-tesla-effects-of-contrast-bolus-length-and-flip-angle
#20
Tilman Schubert, Utaroh Motosugi, Sonja Kinner, Timothy J Colgan, Samir D Sharma, Scott Hetzel, Shane Wells, Camilo A Campo, Scott B Reeder
PURPOSE: Ferumoxytol (FE) has gained interest as an alternative to gadolinium-based contrast agents (GBCAs). The purpose of this study was to evaluate and optimize ferumoxytol dose and T1 weighting, in comparison to a conventional GBCA. MATERIALS AND METHODS: Twelve healthy volunteers (six women / six men, mean age 44.3 years) were recruited for this study. Scanning was performed on a clinical 3 Tesla (T) MRI system. Gadobenate dimeglumine (GD)-enhanced MRA was performed followed by FE-enhanced MRA 1 month later...
November 10, 2016: Journal of Magnetic Resonance Imaging: JMRI
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