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Journal of Magnetic Resonance Imaging: JMRI

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https://www.readbyqxmd.com/read/28432835/detection-of-soft-tissue-abscess-comparison-of-diffusion-weighted-imaging-to-contrast-enhanced-mri
#1
Chang Woo Chun, Joon-Yong Jung, Jun Seung Baik, Won-Hee Jee, Sun Ki Kim, Seung Han Shin
PURPOSE: To compare the diagnostic performances of diffusion-weighted imaging (DWI)-combined magnetic resonance imaging (MRI) performed without intravenous contrast material with gadolinium contrast material-enhanced (CE) MRI for diagnosing soft-tissue abscesses. MATERIALS AND METHODS: In all, 119 patients (mean age: 56 years) with skin and soft-tissue infection who underwent contrast-enhanced MRI with DWI (b = 0-800) were included. Two readers independently reviewed both image sets-nonenhanced conventional MR images (NECI)+DWI, and NECI+contrast enhanced fat-suppressed T1 -weighted imaging (CEFST1 )-for the presence of abscess...
April 22, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28432796/an-acetone-based-phantom-for-quantitative-diffusion-mri
#2
Xiaoke Wang, Scott B Reeder, Diego Hernando
PURPOSE: To propose and evaluate an acetone-D2 O phantom that has an extended range of apparent diffusion coefficient (ADC) for quantitative diffusion magnetic resonance imaging (MRI), as well as to compare its properties to previously described water-based phantoms. MATERIALS AND METHODS: The proposed acetone-D2 O, and previously described sucrose water solution and polyvinylpyrrolidone (PVP) water solution phantoms, were constructed in a number of concentrations between 0% and 50%...
April 22, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28429574/flip-angle-optimization-for-balanced-ssfp-cardiac-cine-imaging-following-the-application-of-standard-extracellular-contrast-agent-gadobutrol
#3
Daniel L R Kuetting, Darius Dabir, Julian Luetkens, Andreas Feisst, Rami Homsi, Daniel Thomas, Hans H Schild, Alois M Sprinkart
PURPOSE: To investigate the effect of the flip angle (FA) on the blood-myocardium contrast and to define the FA leading to highest image quality in contrast-enhanced balanced steady-state free precession (bSSFP) images. bSSFP images provide excellent contrast between myocardium and blood with high signal-to-noise and contrast-to-noise ratios (SNR, CNR). In clinical practice, bSSFP images are typically acquired following the injection of extracellular contrast agents (ECAs), although ECAs decrease the blood-myocardium contrast...
April 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28422391/mr-elastography-detection-of-early-viscoelastic-response-of-the-murine-hippocampus-to-amyloid-%C3%AE-accumulation-and-neuronal-cell-loss-due-to-alzheimer-s-disease
#4
Tonia Munder, Anna Pfeffer, Stefanie Schreyer, Jing Guo, Juergen Braun, Ingolf Sack, Barbara Steiner, Charlotte Klein
PURPOSE: To investigate in vivo viscoelastic parameters related to early histopathological changes in the hippocampus and the cortex in early, preclinical Alzheimer's disease (AD) stages. MATERIALS AND METHODS: Magnetic resonance elastography (MRE) was applied to female APP23 mice, an established transgenic mouse model of AD, at three different stages early in disease progression. To investigate the potential therapeutic effects of physical, cognitive, and social stimulation on brain viscoelasticity and histopathological characteristics, MRE was also applied after exposing young APP23 mice to environmentally enriched cage conditions (ENR), for 1, 12, or 24 weeks, which corresponds to adolescent, young-adult, and adult age at the time of analysis...
April 19, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28422344/use-of-blood-pool-agents-with-steady-state-mri-to-assess-the-vascular-system
#5
Avnesh S Thakor, John Chung, Premal Patel, Anthony Chan, Amdad Ahmed, Graeme McNeil, David M Liu, Bruce Forster, Darren Klass
Over the past two decades there have been significant advances in the use of magnetic resonance imaging (MRI) to assess the vascular system. New imaging sequences and improvements in magnet design have enabled the creation of higher spatial resolution images. MRI is now a viable alternative imaging modality when compared to both invasive angiography and computed tomographic angiography. The use of blood pool agents has further facilitated the use of MR angiography (MRA); their high molecular weight allows for lower doses of contrast medium administration while their prolonged presence in the blood stream allows for repeated high-quality volumetric imaging of both the arterial and venous circulation...
April 19, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28419705/intravoxel-incoherent-motion-mri-for-the-differentiation-of-benign-intermediate-and-malignant-solid-soft-tissue-tumors
#6
Haijun Wu, Shuixing Zhang, Changhong Liang, Hui Liu, Yanhui Liu, Yingjie Mei, Hongjun Liu, Zaiyi Liu, Fangping Xu
PURPOSE: To determine the diagnostic potential of apparent diffusion coefficient (ADC) and intravoxel incoherent motion (IVIM)-derived parameters for the differentiation of benign, intermediate, and malignant solid soft-tissue tumors. MATERIALS AND METHODS: The Institutional Review Board approved this prospective study, and informed consent was obtained. IVIM imaging was performed in 64 patients including 44 benign, 6 intermediate, and 14 malignant solid soft-tissue tumors at 1...
April 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28419645/diagnostic-performance-of-different-imaging-modalities-in-the-assessment-of-distant-metastasis-and-local-recurrence-of-tumor-in-patients-with-non-small-cell-lung-cancer
#7
Yoshiharu Ohno, Takeshi Yoshikawa, Yuji Kishida, Shinichiro Seki, Hisanobu Koyama, Masao Yui, Yoshimori Kassai, Kota Aoyagi, Shigeo Kaminaga, Kazuro Sugimura
PURPOSE: To compare the diagnostic performance of positron emission tomography with [18F] fluoro-2-deoxy-glucose (FDG-PET) coregistered with magnetic resonance imaging (FDG-PET/MRI), MRI with and without diffusion-weighted imaging (DWI), FDG-PET fused with computed tomography (FDG-PET/CT) with brain contrast-enhanced (CE-) MRI, and routine radiological examination for assessment of postoperative recurrence in nonsmall-cell lung cancer (NSCLC) patients. MATERIALS AND METHODS: 96 consecutive postoperative NSCLC patients (52 men, 44 women; mean age 72 years) prospectively underwent whole-body 3T MRI with and without DWI; PET/CTs and routine radiological examinations consisted of CE-brain MRI, whole-body CE-CT, and bone scintigraphy...
April 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28419644/diffusion-weighted-imaging-of-hyperpolarized-13-c-urea-in-mouse-liver
#8
Irene Marco-Rius, Jeremy W Gordon, Aras N Mattis, Robert Bok, Romelyn Delos Santos, Subramanian Sukumar, Peder E Z Larson, Daniel B Vigneron, Michael A Ohliger
PURPOSE: To compare the apparent diffusion coefficient (ADC) of hyperpolarized (HP) [(13) C,(15) N]urea to the ADC of endogenous water in healthy and fibrotic mouse liver. MATERIALS AND METHODS: ADC measurements for water and [(13) C]urea were made in agarose phantoms at 14.1T. Next, the ADC of water and injected HP [(13) C,(15) N]urea were measured in eight CD1 mouse livers before and after induction of liver fibrosis using CCl4 . Liver fibrosis was quantified pathologically using the modified Brunt fibrosis score and compared to the measured ADC of water and urea...
April 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28419614/prospective-comparison-of-biphasic-contrast-enhanced-ct-volume-perfusion-ct-and-3-tesla-mri-with-diffusion-weighted-imaging-for-insulinoma-detection
#9
Liang Zhu, Huadan Xue, Zhaoyong Sun, Ping Li, Tianyi Qian, Xiaoping Xing, Naishi Li, Yupei Zhao, Wenming Wu, Zhengyu Jin
PURPOSE: To evaluate the diagnostic performance of biphasic contrast-enhanced CT (CECT), volume perfusion CT (VPCT) and 3 Tesla MRI with diffusion-weighted imaging (DWI), in patients with clinically suspected insulinomas. MATERIALS AND METHODS: This prospective study was approved by the institutional review board. Sixty-four patients with clinically suspected insulinomas underwent biphasic CECT, VPCT, and 3T MR with DWI. Two radiologists independently determined the presence/absence of tumor using a 5-scale confidence level...
April 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28419613/peg-poly-l-lysine-based-polymeric-micelle-mri-contrast-agent-feasibility-study-of-a-gd-micelle-contrast-agent-for-mr-lymphography
#10
Hiroyuki Akai, Kouichi Shiraishi, Masayuki Yokoyama, Koichiro Yasaka, Masanori Nojima, Yusuke Inoue, Osamu Abe, Kuni Ohtomo, Shigeru Kiryu
PURPOSE: To investigate the feasibility of polymeric micelle of poly(ethyleneglycol) (PEG)-b-poly(L-lysine-DOTA) (Gd-micelle) as a contrast agent for magnetic resonance lymphography (MRL). MATERIALS AND METHODS: Twenty-four female BALB/c mice were randomly divided into four groups of six mice each. Among them, mice of two groups were injected of complete Freund's adjuvant to obtain inflamed lymph nodes. We subcutaneously injected 0.5 μmol Gd per mouse of Gd-micelle or gadofluorine P in the right rear footpad...
April 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28419612/delayed-gadolinium-enhanced-mri-of-cartilage-dgemric-and-t2-mapping-of-talar-osteochondral-lesions-indicators-of-clinical-outcomes
#11
Christoph Rehnitz, Benita Kuni, Felix Wuennemann, Dimitrios Chloridis, Anand Kirwadi, Iris Burkholder, Hans-Ulrich Kauczor, Marc-André Weber
PURPOSE: To evaluate the utility of delayed gadolinium-enhanced magnetic resonance imaging of cartilage (dGEMRIC) and T2 mapping in evaluation of type II osteochondral lesions (OCLs) of the talus and define cutoff values for identifying patients with good/poor clinical outcomes. MATERIALS AND METHODS: 28 patients (mean age, 42.3 years) underwent T2 mapping and dGEMRIC at least 1.5 years (mean duration, 3.5 years) after microfracture (n = 12) or conservative (n = 16) treatment for type II OCL...
April 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28419608/multiple-breath-hold-proton-spectroscopy-of-human-liver-at-3t-relaxation-times-and-concentrations-of-glycogen-choline-and-lipids
#12
Jan Weis, Joel Kullberg, Håkan Ahlström
PURPOSE: To evaluate the feasibility of an expiration multiple breath-hold (1) H-MRS technique to measure glycogen (Glycg), choline-containing compounds (CCC), and lipid relaxation times T1 , T2 , and their concentrations in normal human liver. MATERIALS AND METHODS: Thirty healthy volunteers were recruited. Experiments were performed at 3T. Multiple expiration breath-hold single-voxel point-resolved spectroscopy (PRESS) technique was used for localization. Water-suppressed spectra were used for the estimation of Glycg, CCC, lipid methylene (CH2 )n relaxation times and concentrations...
April 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28419602/physics-for-clinicians-fluid-attenuated-inversion-recovery-flair-and-double-inversion-recovery-dir-imaging
#13
REVIEW
Manojkumar Saranathan, Pauline W Worters, Dan W Rettmann, Blair Winegar, Jennifer Becker
A pedagogical review of fluid-attenuated inversion recovery (FLAIR) and double inversion recovery (DIR) imaging is conducted in this article. The basics of the two pulse sequences are first described, including the details of the inversion preparation and imaging sequences with accompanying mathematical formulae for choosing the inversion time in a variety of scenarios for use on clinical MRI scanners. Magnetization preparation (or T2prep), a strategy for improving image signal-to-noise ratio and contrast and reducing T1 weighting at high field strengths, is also described...
April 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28407374/regional-cerebral-hyperperfusion-a-biomarker-of-upcoming-stroke-like-episodes
#14
LETTER
Josef Finsterer, Sinda Zarrouk-Mahjoub
No abstract text is available yet for this article.
April 13, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28407330/diffusion-weighted-and-magnetization-transfer-imaging-in-testicular-spermatogenic-function-evaluation-preliminary-results
#15
Huanjun Wang, Jian Guan, Jinhua Lin, Zhongwei Zhang, Shurong Li, Yan Guo, Huasong Cai
PURPOSE: To assess the use of functional magnetic resonance imaging (MRI), including diffusion-weighted MRI (DWI) and magnetization transfer MRI (MTI) in evaluating male infertility. MATERIALS AND METHODS: Sixteen men with testicular spermatogenesis hypofunction confirmed by percutaneous testis biopsy and 31 volunteers (control group B, age range: 20-40 years) with normal semen analysis including younger (By, n = 15, age range: 20-30 years) and older (Bo, n = 16, age range: 31-40 years) men underwent pelvic 3T MRI, including DWI and MTI...
April 13, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28398710/additional-values-of-high-resolution-gadoxetic-acid-enhanced-mr-cholangiography-for-evaluating-the-biliary-anatomy-of-living-liver-donors-comparison-with-t2-weighted-mr-cholangiography-and-conventional-gadoxetic-acid-enhanced-mr-cholangiography
#16
Hyo-Jin Kang, Jeong Min Lee, Jeong Hee Yoon, Ijin Joo, Won Chang, Kyung-Suk Suh, Kwang-Woong Lee, Nam-Joon Yi, Joon Koo Han
PURPOSE: To determine the incremental value of small field of view (sFOV) high-resolution (HR) gadoxetic acid-enhanced 3D T1 -weighted (W) magnetic resonance cholangiography (MRC) for evaluating the biliary anatomy of potential living donors by comparing it to T2 W-MRC. MATERIALS AND METHODS: In all, 73 living donor candidates underwent gadoxetic acid-enhanced MRI (3.0T) including three kinds of MRCs: 3D multislice T2 W-MRC, regular FOV (rFOV) (380 × 380mm, resolution 1...
April 11, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28390180/valve-mediated-hemodynamics-and-their-association-with-distal-ascending-aortic-diameter-in-bicuspid-aortic-valve-subjects
#17
Vrishank Raghav, Alex J Barker, Daniel Mangiameli, Lucia Mirabella, Michael Markl, Ajit P Yoganathan
PURPOSE: Valve mediated hemodynamics have been postulated to contribute to pathology of the ascending aorta (AAo). The objective of this study is to assess the association of aortic valve morphology and hemodynamics with downstream AAo size in subjects with bicuspid aortic valve (BAV) disease. MATERIALS AND METHODS: Four-dimensional flow MRI at 1.5 or 3 Tesla was used to evaluate the hemodynamics in the proximal AAo of 52 subjects: size-matched controls with tricuspid aortic valves (n = 24, mid ascending aorta [MAA] diameter = 38...
April 8, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28387981/evaluation-of-mri-for-diagnosis-of-extraprostatic-extension-in-prostate-cancer
#18
Satheesh Krishna, Christopher S Lim, Matthew D F McInnes, Trevor A Flood, Wael M Shabana, Robert S Lim, Nicola Schieda
PURPOSE: To assess the ability of magnetic resonance imaging (MRI) to diagnose extraprostatic extension (EPE) in prostate cancer. MATERIALS AND METHODS: With Institutional Review Board (IRB) approval, 149 men with 170 ≥0.5 mL tumors underwent preoperative 3T MRI followed by radical prostatectomy (RP) between 2012-2015. Two blinded radiologists (R1/R2) assessed tumors using Prostate Imaging Reporting and Data System (PI-RADS) v2, subjectively evaluated for the presence of EPE, measured tumor size, and length of capsular contact (LCC)...
April 7, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28383796/arterial-spin-labeling-mri-is-able-to-detect-early-hemodynamic-changes-in-diabetic-nephropathy
#19
José María Mora-Gutiérrez, Nuria Garcia-Fernandez, M Fernanda Slon Roblero, Jose A Páramo, F Javier Escalada, Danny Jj Wang, Alberto Benito, María A Fernández-Seara
PURPOSE: To investigate whether arterial spin labeling (ASL) MRI could detect renal hemodynamic impairment in diabetes mellitus (DM) along different stages of chronic kidney disease (CKD). MATERIALS AND METHODS: Three Tesla (3T) ASL-MRI was performed to evaluate renal blood flow (RBF) in 91 subjects (46 healthy volunteers and 45 type 2 diabetic patients). Patients were classified according to their estimated glomerular filtration rate (eGFR) as group I (eGFR > 60 mL/min/1...
April 6, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28383791/breath-hold-and-free-breathing-2d-phase-contrast-mri-for-quantification-of-oxygen-induced-changes-of-pulmonary-circulation-dynamics-in-healthy-volunteers
#20
Christoph P Czerner, Hinrich B Winther, Antonia Zapf, Frank Wacker, Jens Vogel-Claussen
PURPOSE: To evaluate the effect of inhaled 100% oxygen on pulmonary circulation dynamics in healthy volunteers using 2D phase-contrast magnetic resonance imaging (2D PC MRI). MATERIALS AND METHODS: Twenty-one healthy volunteers were examined at 1.5T. Through-plane 2D PC MRI measurements were performed in the main pulmonary artery during free-breathing and breath-hold. Acceleration time and volume, maximum and minimum area, area change, average and maximum mean velocity, forward volume, heart rate, as well as blood pressure were determined...
April 6, 2017: Journal of Magnetic Resonance Imaging: JMRI
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