7,777 results match your criteria Journal of Magnetic Resonance Imaging[Journal]


Magnetic resonance imaging: Proton density fat fraction for assessment of pancreatic fatty infiltration during progression of T2DM bama minipigs.

J Magn Reson Imaging 2019 Apr 21. Epub 2019 Apr 21.

First Affiliated Hospital of Guangxi Medical University, Radiology Department, Guangxi, China.

Background: Recent studies have highlighted the correlation between diabetes and pancreatic fat infiltration. However, pancreatic fat content (PFC) is rarely confirmed by pathological results, and a change of PFC during progression of type 2 diabetes (T2DM) is currently controversial.

Purpose: To evaluate the relationship of MRI-pancreatic proton density fat fraction to serologic changes and histology in an experimental model of diabetes. Read More

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http://dx.doi.org/10.1002/jmri.26754DOI Listing

Background parenchymal enhancement on breast MRI: A comprehensive review.

J Magn Reson Imaging 2019 Apr 19. Epub 2019 Apr 19.

Department of Radiology, University of Washington School of Medicine, Seattle, Washington, USA.

The degree of normal fibroglandular tissue that enhances on breast MRI, known as background parenchymal enhancement (BPE), was initially described as an incidental finding that could affect interpretation performance. While BPE is now established to be a physiologic phenomenon that is affected by both endogenous and exogenous hormone levels, evidence supporting the notion that BPE frequently masks breast cancers is limited. However, compelling data have emerged to suggest BPE is an independent marker of breast cancer risk and breast cancer treatment outcomes. Read More

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https://onlinelibrary.wiley.com/doi/abs/10.1002/jmri.26762
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http://dx.doi.org/10.1002/jmri.26762DOI Listing
April 2019
1 Read

Vessel wall and lumen characteristics with age in healthy participants using 3T intracranial vessel wall magnetic resonance imaging.

J Magn Reson Imaging 2019 Apr 17. Epub 2019 Apr 17.

Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, Tennessee, USA.

Background: Intracranial vessel wall imaging (VWI) at a clinical field strength of 3T has become more widely available. However, how vessel measurements change with age and sex, over an age range spanning a typical lifespan, are needed.

Purpose/hypothesis: To assess for identifiable changes in arterial wall thickness, outer vessel wall diameter, and lumen diameter with age cross-sectionally in healthy controls without cerebrovascular disease risk factors at the spatial resolution afforded by currently recommended 3T VWI approaches. Read More

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http://dx.doi.org/10.1002/jmri.26750DOI Listing

Effects of Signal Averaging, Gradient Encoding Scheme, and Spatial Resolution on Diffusion Kurtosis Imaging: An Empirical Study Using 7T MRI.

J Magn Reson Imaging 2019 Apr 16. Epub 2019 Apr 16.

Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes (NHRI), Miaoli, Taiwan.

Background: Although diffusion gradient directions and b-values have been optimized for diffusion kurtosis imaging (DKI), little is known about the effect of signal averaging on DKI reliability.

Purpose: To evaluate how signal averaging influences the reliability of DKI indices using two gradient encoding schemes with three spatial resolutions.

Study Type: Prospective. Read More

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http://dx.doi.org/10.1002/jmri.26755DOI Listing

Exploratory study of geometric distortion correction of prostate diffusion-weighted imaging using B map acquisition.

J Magn Reson Imaging 2019 Apr 16. Epub 2019 Apr 16.

Department of Radiology, NYU Langone Health, New York, New York, USA.

Background: Evaluation of prostate MRI relies on diffusion-weighted imaging (DWI), commonly distorted by susceptibility artifacts, thereby creating a need for approaches to correct such distortion.

Purpose: To compare geometric distortion on prostate MRI between standard DWI and a geometric distortion correction method for DWI described as static distortion correction DWI (SDC DWI).

Study Type: Retrospective case study. Read More

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http://dx.doi.org/10.1002/jmri.26751DOI Listing

Zero TE MRI Applications to Transcranial MR-Guided Focused Ultrasound: Patient Screening and Treatment Efficiency Estimation.

J Magn Reson Imaging 2019 Apr 16. Epub 2019 Apr 16.

hmCINAC (Centro Integral de Neurociencias), University Hospital HM Puerta del Sur, CEU-San Pablo University, Móstoles, Madrid, Spain.

Background: The high acoustic impedance of the skull limits the performance of transcranial magnetic resonance-guided focused ultrasound (tcMRgFUS) therapy. Subject suitability screening is based on skull parameters estimated from computed tomography (CT) scans.

Purpose: To assess the feasibility of screening for tcMRgFUS based on zero echo time (ZTE) MRI, and to explore the influence of measurable skull parameters in treatment performance. Read More

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http://dx.doi.org/10.1002/jmri.26746DOI Listing

Quality-based pharmacokinetic model selection on DCE-MRI for characterizing orbital lesions.

J Magn Reson Imaging 2019 Apr 15. Epub 2019 Apr 15.

Université Paris Descartes Sorbonne Paris Cité, INSERM UMR-S970, Cardiovascular Research Center - PARCC, Paris, France.

Background: Although several studies have evaluated dynamic contrast-enhanced (DCE) MRI in the orbit, showing its utility when detecting and diagnosing orbital lesions, none have evaluated the pharmacokinetic models.

Purpose: To provide a quality-based pharmacokinetic model selection for characterizing orbital lesions using DCE-MRI at 3.0T. Read More

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http://dx.doi.org/10.1002/jmri.26747DOI Listing
April 2019
1 Read

Influence of temporal parameters of DCE-MRI on the quantification of heterogeneity in tumor vascularization.

J Magn Reson Imaging 2019 Apr 13. Epub 2019 Apr 13.

Department of Radiology, Institut Bergonié, Comprehensive Cancer Center, Bordeaux, France.

Background: Evaluating heterogeneity in tumor vascularization through texture analysis could improve predictions of patients' outcome and response evaluation.

Purpose: To investigate the influence of temporal parameters on texture features extracted from dynamic contrast-enhanced (DCE)-MRI parametric maps.

Study Type: Prospective cross-sectional study. Read More

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http://dx.doi.org/10.1002/jmri.26753DOI Listing

A predictive nomogram for individualized recurrence stratification of bladder cancer using multiparametric MRI and clinical risk factors.

J Magn Reson Imaging 2019 Apr 13. Epub 2019 Apr 13.

School of Biomedical Engineering, Air Force Medical University (Fourth Military Medical University), Xi'an, Shaanxi, PR China.

Background: Preoperative prediction of bladder cancer (BCa) recurrence risk is critical for individualized clinical management of BCa patients.

Purpose: To develop and validate a nomogram based on radiomics and clinical predictors for personalized prediction of the first 2 years (TFTY) recurrence risk.

Study Type: Retrospective. Read More

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https://onlinelibrary.wiley.com/doi/abs/10.1002/jmri.26749
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http://dx.doi.org/10.1002/jmri.26749DOI Listing
April 2019
4 Reads

Proton density fat fraction MRI of vertebral bone marrow: Accuracy, repeatability, and reproducibility among readers, field strengths, and imaging platforms.

J Magn Reson Imaging 2019 Apr 13. Epub 2019 Apr 13.

Department of Radiology and Radiation Oncology, University Hospital Bonn, Rheinische-Friedrich-Wilhelms-Universität Bonn, Bonn, North Rhine-Westphalia (NRW), Germany.

Background: Chemical shift-encoding based water-fat MRI is an emerging method to noninvasively assess proton density fat fraction (PDFF), a promising quantitative imaging biomarker for estimating tissue fat concentration. However, in vivo validation of PDFF is still lacking for bone marrow applications.

Purpose: To determine the accuracy and precision of MRI-determined vertebral bone marrow PDFF among different readers and across different field strengths and imager manufacturers. Read More

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http://dx.doi.org/10.1002/jmri.26748DOI Listing
April 2019
1 Read

Clinical feasibility study of 3D intracranial magnetic resonance angiography using compressed sensing.

J Magn Reson Imaging 2019 Apr 13. Epub 2019 Apr 13.

Department of Radiology, Peking University First Hospital, Beijing, China.

Background: Compressed sensing (CS) has been widely used to improve the speed of MRI, but the feasibility of application in 3D intracranial MR angiography (MRA) needs to be evaluated in clinical practice.

Purpose: To evaluate the clinical feasibility of CS-MRA in comparison with conventional 3D-MRA (Con-MRA).

Study Type: Retrospective. Read More

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http://dx.doi.org/10.1002/jmri.26752DOI Listing
April 2019
1 Read
3.210 Impact Factor

Repeatability of regional pulmonary functional metrics of Hyperpolarized Xe dissolved-phase MRI.

J Magn Reson Imaging 2019 Apr 10. Epub 2019 Apr 10.

Department of Medical Physics, University of Wisconsin, Madison, Wisconsin, USA.

Background: MRI of hyperpolarized Xenon (HP Xe) is increasingly utilized for investigating pulmonary function. The solubility of HP Xe in lung tissue, blood plasma (Barrier), and red blood cells (RBC), with unique chemical shifts, enables spectroscopic imaging of potential imaging biomarkers of gas exchange and microstructural pulmonary physiology.

Purpose: To quantify global average and regional repeatability of Barrier:gas, RBC:gas, and RBC:Barrier ratios derived from dissolved-phase Xe imaging and their dependence on intervisit changes in lung inflation volume. Read More

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http://dx.doi.org/10.1002/jmri.26745DOI Listing

3D quantitative synthetic MRI-derived cortical thickness and subcortical brain volumes: Scan-rescan repeatability and comparison with conventional T -weighted images.

J Magn Reson Imaging 2019 Apr 10. Epub 2019 Apr 10.

Department of Radiology, Juntendo University Hospital, Tokyo, Japan.

Background: Previous quantitative synthetic MRI of the brain has been solely performed in 2D.

Purpose: To evaluate the feasibility of the recently developed sequence 3D-QALAS for brain cortical thickness and volumetric analysis.

Study Type: Reproducibility/repeatability study. Read More

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http://dx.doi.org/10.1002/jmri.26744DOI Listing
April 2019
2 Reads

Head-to-head comparison between multiparametric MRI, the partin tables, memorial sloan kettering cancer center nomogram, and CAPRA score in predicting extraprostatic cancer in patients undergoing radical prostatectomy.

J Magn Reson Imaging 2019 Apr 7. Epub 2019 Apr 7.

Institute of Radiology, Department of Medicine, University of Udine, "S. Maria della Misericordia" University Hospital, Udine, Italy.

Background: It is unclear whether clinical models including the Partin tables (PT), the Memorial Sloan Kettering Cancer Center nomogram (MSKCCn), and the cancer of the prostate risk assessment (CAPRA) can benefit from incorporating multiparametric magnetic resonance imaging (mpMRI) when staging prostate cancer (PCa).

Purpose: To compare the accuracy of clinical models, mpMRI, and mpMRI plus clinical models in predicting stage ≥pT3 of PCa.

Study Type: Prospective monocentric cohort study. Read More

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http://dx.doi.org/10.1002/jmri.26743DOI Listing
April 2019
1 Read

Biexponential R2* Relaxometry for Estimation of Liver Iron Concentration in Children: A Better Fit for High Liver Iron States.

J Magn Reson Imaging 2019 Apr 5. Epub 2019 Apr 5.

Department of Radiology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.

Background: R2* relaxometry's capacity to calculate liver iron concentration (LIC) is limited in patients with severe overload. Hemosiderin increases in these patients, which exhibits a non-monoexponential decay that renders a failed R2* analysis.

Purpose/hypothesis: To evaluate a biexponential R2* relaxometry model in children with different ranges of iron overload. Read More

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http://dx.doi.org/10.1002/jmri.26735DOI Listing
April 2019
3 Reads

Prolonged Heating in Nontargeted Tissue During MR-guided Focused Ultrasound of Bone Tumors.

J Magn Reson Imaging 2019 Apr 5. Epub 2019 Apr 5.

School of Medicine, Department of Radiology, Stanford University, Stanford, California, USA.

Background: Thermal dosimetry during MR-guided focused ultrasound (MRgFUS) of bone tumors underpredicts ablation zone. Intraprocedural understanding of heat accumulation near bone is needed to prevent undesired treatment of nontargeted tissue.

Hypothesis: Temperature decay rates predict prolonged, spatially varying heating during MRgFUS bone treatments. Read More

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https://onlinelibrary.wiley.com/doi/abs/10.1002/jmri.26726
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http://dx.doi.org/10.1002/jmri.26726DOI Listing
April 2019
6 Reads

Cruciate ligament injuries of the knee: A meta-analysis of the diagnostic performance of 3D MRI.

J Magn Reson Imaging 2019 Apr 5. Epub 2019 Apr 5.

Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins University, Baltimore, Maryland, USA.

Background: Despite the advantages of 3D MRI in evaluation of cruciate ligament injuries, its use in clinical practice is still a matter of debate due to controversy regarding its diagnostic performance.

Purpose: To evaluate the diagnostic performance of 3D MRI for detecting cruciate ligament injuries, using surgery or arthroscopy as the reference standard.

Study Type: Meta-analysis. Read More

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http://dx.doi.org/10.1002/jmri.26713DOI Listing
April 2019
3 Reads

Deep Convolutional Neural Networks With Multiplane Consensus Labeling for Lung Function Quantification Using UTE Proton MRI.

J Magn Reson Imaging 2019 Apr 4. Epub 2019 Apr 4.

Department of Radiology, University of Wisconsin-Madison, Madison, Wisconsin, USA.

Background: Ultrashort echo time (UTE) proton MRI has gained popularity for assessing lung structure and function in pulmonary imaging; however, the development of rapid biomarker extraction and regional quantification has lagged behind due to labor-intensive lung segmentation.

Purpose: To evaluate a deep learning (DL) approach for automated lung segmentation to extract image-based biomarkers from functional lung imaging using 3D radial UTE oxygen-enhanced (OE) MRI.

Study Type: Retrospective study aimed to evaluate a technical development. Read More

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http://dx.doi.org/10.1002/jmri.26734DOI Listing
April 2019
2 Reads
3.210 Impact Factor

Comparison of Intravoxel incoherent motion imaging and multiecho dynamic contrast-based MRI in rectal cancer.

J Magn Reson Imaging 2019 Apr 4. Epub 2019 Apr 4.

Department of Physics, University of Oslo, Oslo, Norway.

Background: Dynamic contrast-based MRI and intravoxel incoherent motion imaging (IVIM) MRI are both methods showing promise as diagnostic and prognostic tools in rectal cancer. Both methods aim at measuring perfusion-related parameters, but the relationship between them is unclear.

Purpose: To investigate the relationship between perfusion- and permeability-related parameters obtained by IVIM-MRI, T -weighted dynamic contrast-enhanced (DCE)-MRI and T *-weighted dynamic susceptibility contrast (DSC)-MRI. Read More

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http://dx.doi.org/10.1002/jmri.26740DOI Listing

MRI Characteristics of Supraclavicular Brown Adipose Tissue in Relation to Cold-Induced Thermogenesis in Healthy Human Adults.

J Magn Reson Imaging 2019 Apr 4. Epub 2019 Apr 4.

Department of Endocrinology, Diabetes and Metabolism, University Hospital of Basel and University of Basel, Basel, Switzerland.

Background: Brown adipose tissue (BAT) has been proposed as a target to treat obesity and metabolic disease. Currently, F-Fluordeoxyglucose positron emission tomography (FDG-PET) is the standard for BAT-imaging. MRI might be a promising alternative, as it is not associated with ionizing radiation, offers a high resolution, and allows to discriminate different types of soft tissue. Read More

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http://dx.doi.org/10.1002/jmri.26733DOI Listing

On the Field Strength Dependence of Bi- and Triexponential Intravoxel Incoherent Motion (IVIM) Parameters in the Liver.

J Magn Reson Imaging 2019 Apr 3. Epub 2019 Apr 3.

Institute of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany.

Background: Studies on intravoxel incoherent motion (IVIM) imaging are carried out with different acquisition protocols.

Purpose: To investigate the dependence of IVIM parameters on the B field strength when using a bi- or triexponential model.

Study Type: Prospective. Read More

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http://dx.doi.org/10.1002/jmri.26730DOI Listing
April 2019
4 Reads

Cerebral blood flow territory instability in patients with atherosclerotic intracranial stenosis.

J Magn Reson Imaging 2019 Apr 2. Epub 2019 Apr 2.

Department of Radiology, Vanderbilt University Medical Center, Nashville, Tennessee, USA.

Background: Stroke risk stratification in patients with symptomatic intracranial atherosclerotic arterial disease (ICAD) remains an important clinical objective owing to the high 14-19% recurrent stroke rate in these patients on standard-of-care medical management. There thus remains a need for hemodynamic markers that may allow for the selection of personalized therapies for high-risk symptomatic patients.

Purpose: To determine if shifting of cerebral blood flow (CBF) territories in response to changes in cerebral perfusion pressure (CPP) may provide a marker for stroke risk in ICAD patients. Read More

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http://dx.doi.org/10.1002/jmri.26737DOI Listing
April 2019
2 Reads

Association of Glioma Grading With Inflow-Based Vascular-Space-Occupancy MRI: A Preliminary Study at 3T.

J Magn Reson Imaging 2019 Apr 1. Epub 2019 Apr 1.

Department of Medical Imaging, Nanfang Hospital, Southern Medical University, Guangzhou, P.R. China.

Background: Inflow-based vascular-space-occupancy (iVASO) MRI is a noninvasive perfusion technique that does not require administration of exogenous contrast agents. Arteriolar cerebral blood volume (CBVa) obtained from iVASO MRI is hypothesized to be an indicator of tumor microvasculature.

Purpose: To assess the diagnostic performance of iVASO MRI implemented at 3T in predicting histologic grades of cerebral gliomas. Read More

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http://dx.doi.org/10.1002/jmri.26741DOI Listing
April 2019
1 Read

Diagnostic performance of a new multicontrast one-minute full brain exam (EPIMix) in neuroradiology: A prospective study.

J Magn Reson Imaging 2019 Apr 1. Epub 2019 Apr 1.

Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.

Background: Clinical MRI protocols are time-consuming; hence, new faster techniques are needed. One new fast multicontrast MRI technique, called echo planar image mix (EPIMix) (including contrasts T -FLAIR, T -weighted, diffusion-weighted images [DWI], apparent diffusion coefficient [ADC], T *-weighted, and T -FLAIR images) needs to be tested.

Purpose: To assess if EPIMix has comparable diagnostic performance as routine clinical brain MRI. Read More

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http://dx.doi.org/10.1002/jmri.26742DOI Listing
April 2019
1 Read

Whole-Body MRI for Preventive Health Screening: A Systematic Review of the Literature.

J Magn Reson Imaging 2019 Apr 1. Epub 2019 Apr 1.

Department of Radiology, Nuclear Medicine and Molecular Imaging, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands.

Background: The yield of whole-body MRI for preventive health screening is currently not completely clear.

Purpose: To systematically review the prevalence of whole-body MRI findings in asymptomatic subjects.

Study Type: Systematic review and meta-analysis. Read More

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http://dx.doi.org/10.1002/jmri.26736DOI Listing
April 2019
1 Read

Translating preclinical MRI methods to clinical oncology.

J Magn Reson Imaging 2019 Mar 29. Epub 2019 Mar 29.

Oden Institute for Computational Science and Engineering, Institute for Computational Engineering and Sciences, University of Texas at Austin, Austin, Texas, USA.

The complexity of modern in vivo magnetic resonance imaging (MRI) methods in oncology has dramatically changed in the last 10 years. The field has long since moved passed its (unparalleled) ability to form images with exquisite soft-tissue contrast and morphology, allowing for the enhanced identification of primary tumors and metastatic disease. Currently, it is not uncommon to acquire images related to blood flow, cellularity, and macromolecular content in the clinical setting. Read More

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http://dx.doi.org/10.1002/jmri.26731DOI Listing

Weakly supervised 3D deep learning for breast cancer classification and localization of the lesions in MR images.

J Magn Reson Imaging 2019 Mar 29. Epub 2019 Mar 29.

Department of Computer Science and Engineering, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong.

Background: The usefulness of 3D deep learning-based classification of breast cancer and malignancy localization from MRI has been reported. This work can potentially be very useful in the clinical domain and aid radiologists in breast cancer diagnosis.

Purpose: To evaluate the efficacy of 3D deep convolutional neural network (CNN) for diagnosing breast cancer and localizing the lesions at dynamic contrast enhanced (DCE) MRI data in a weakly supervised manner. Read More

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http://dx.doi.org/10.1002/jmri.26721DOI Listing

Monoexponential, Biexponential, and stretched-exponential models using diffusion-weighted imaging: A quantitative differentiation of breast lesions at 3.0T.

J Magn Reson Imaging 2019 Mar 27. Epub 2019 Mar 27.

Department of Magnetic Resonance Imaging, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.

Background: Diffusion-weighted imaging (DWI) plays an important role in the differentiation of malignant and benign breast lesions.

Purpose: To investigate the utility of various diffusion parameters obtained from monoexponential, biexponential, and stretched-exponential DWI models in the differential diagnosis of breast lesions.

Study Type: Prospective. Read More

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http://dx.doi.org/10.1002/jmri.26729DOI Listing
March 2019
2 Reads

Characterization of Sub-1 cm Breast Lesions Using Radiomics Analysis.

J Magn Reson Imaging 2019 Mar 27. Epub 2019 Mar 27.

Breast Imaging Service, Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York, USA.

Background: Small breast lesions are difficult to visually categorize due to the inherent lack of morphological and kinetic detail.

Purpose: To assess the efficacy of radiomics analysis in discriminating small benign and malignant lesions utilizing model free parameter maps.

Study Type: Retrospective, single center. Read More

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https://onlinelibrary.wiley.com/doi/abs/10.1002/jmri.26732
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http://dx.doi.org/10.1002/jmri.26732DOI Listing
March 2019
5 Reads

Quantification of patellofemoral cartilage deformation and contact area changes in response to static loading via high-resolution MRI with prospective motion correction.

J Magn Reson Imaging 2019 Mar 23. Epub 2019 Mar 23.

Department of Orthopedic and Trauma Surgery, Medical Center - Albert-Ludwigs-University of Freiburg, Faculty of Medicine, Albert-Ludwigs-University of Freiburg, Freiburg im Breisgau, Germany.

Background: Higher-resolution MRI of the patellofemoral cartilage under loading is hampered by subject motion since knee flexion is required during the scan.

Purpose: To demonstrate robust quantification of cartilage compression and contact area changes in response to in situ loading by means of MRI with prospective motion correction and regularized image postprocessing.

Study Type: Cohort study. Read More

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http://dx.doi.org/10.1002/jmri.26724DOI Listing

IMPROD biparametric MRI in men with a clinical suspicion of prostate cancer (IMPROD Trial): Sensitivity for prostate cancer detection in correlation with whole-mount prostatectomy sections and implications for focal therapy.

J Magn Reson Imaging 2019 Mar 22. Epub 2019 Mar 22.

Institute of Biomedicine, University of Turku and Department of Pathology, Turku University Hospital, Turku, Finland.

Background: Prostate MRI is increasingly being used in men with a clinical suspicion of prostate cancer (PCa). However, development and validation of methods for focal therapy planning are still lagging.

Purpose: To evaluate the diagnostic accuracy on lesion, region-of-interest (ROI), and voxel level of IMPROD biparametric prostate MRI (bpMRI) for PCa detection in men with a clinical suspicion of PCa who subsequently underwent radical prostatectomy. Read More

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http://dx.doi.org/10.1002/jmri.26727DOI Listing
March 2019
2 Reads

Accuracy of Deep Learning to Differentiate the Histopathological Grading of Meningiomas on MR Images: A Preliminary Study.

J Magn Reson Imaging 2019 Mar 21. Epub 2019 Mar 21.

Department of Animal Medicine, Productions and Health, University of Padua, Legnaro, Italy.

Background: Grading of meningiomas is important in the choice of the most effective treatment for each patient.

Purpose: To determine the diagnostic accuracy of a deep convolutional neural network (DCNN) in the differentiation of the histopathological grading of meningiomas from MR images.

Study Type: Retrospective. Read More

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http://dx.doi.org/10.1002/jmri.26723DOI Listing

Glioma Grading Using a Machine-Learning Framework Based on Optimized Features Obtained From T Perfusion MRI and Volumes of Tumor Components.

J Magn Reson Imaging 2019 Mar 20. Epub 2019 Mar 20.

Centre for Biomedical Engineering, Indian Institute of Technology Delhi, New Delhi, India.

Background: Glioma grading between intermediate grades (Grade II vs. III and Grade III vs. IV) as well as multiclass grades (Grade II vs. Read More

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http://dx.doi.org/10.1002/jmri.26704DOI Listing
March 2019
3.210 Impact Factor

Repeatability and Reproducibility of 3D MR Fingerprinting Relaxometry Measurements in Normal Breast Tissue.

J Magn Reson Imaging 2019 Mar 20. Epub 2019 Mar 20.

Department of Radiology, Case Western Reserve University, Cleveland, Ohio, USA.

Background: The 3D breast magnetic resonance fingerprinting (MRF) technique enables T and T mapping in breast tissues. Combined repeatability and reproducibility studies on breast T and T relaxometry are lacking.

Purpose: To assess test-retest and two-visit repeatability and interscanner reproducibility of the 3D breast MRF technique in a single-institution setting. Read More

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http://dx.doi.org/10.1002/jmri.26717DOI Listing
March 2019
1 Read
3.210 Impact Factor

Prospective evaluation of MRI compared with CT for the etiology of abdominal pain in emergency department patients with concern for appendicitis.

J Magn Reson Imaging 2019 Mar 20. Epub 2019 Mar 20.

BerbeeWalsh Department of Emergency Medicine, University of Wisconsin - Madison, Madison, Wisconsin, USA.

Background: Computed tomography (CT) is commonly used in the Emergency Department (ED) to evaluate patients with abdominal pain, but exposes them to ionizing radiation, a possible carcinogen. MRI does not utilize ionizing radiation and may be an alternative.

Purpose: To compare the sensitivity of MRI and CT for acute abdominopelvic ED diagnoses. Read More

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https://onlinelibrary.wiley.com/doi/abs/10.1002/jmri.26728
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http://dx.doi.org/10.1002/jmri.26728DOI Listing
March 2019
5 Reads

Total Cerebrovascular Blood Flow and Whole Brain Perfusion in Children Sedated Using Propofol With or Without Ketamine at Induction: An Investigation With 2D-Cine PC and ASL.

J Magn Reson Imaging 2019 Mar 20. Epub 2019 Mar 20.

Children's Research Center, University Children's Hospital, Zurich, Switzerland.

Background: Multiple sedation regimes may be used to facilitate pediatric MRI scans. These regimes might affect cerebral blood flow and hemodynamics to varying degrees, particularly in children who may be vulnerable to anesthetic side effects.

Purpose: To compare the effects of propofol monosedation solely (Pm group) vs. Read More

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http://dx.doi.org/10.1002/jmri.26725DOI Listing

Assessment of sympathetic reinnervation after cardiac transplantation using hybrid cardiac PET/MRI: A pilot study.

J Magn Reson Imaging 2019 Mar 20. Epub 2019 Mar 20.

Department of Biomedical Imaging and Image-Guided Therapy, Division of Cardiovascular and Interventional Radiology, Medical University of Vienna, Vienna, Austria.

Background: Sympathetic reinnervation after heart transplantation (HTX) is a known phenomenon, which has an impact on patient heart rate variability and exercise capacity. The impact of reinnervation on myocardial structure has not been evaluated yet.

Propose: To evaluate the feasibility of simultaneous imaging of cardiac reinnervation and cardiac structure using a hybrid PET/MRI system. Read More

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http://dx.doi.org/10.1002/jmri.26722DOI Listing
March 2019
2 Reads

Data-driven synthetic MRI FLAIR artifact correction via deep neural network.

J Magn Reson Imaging 2019 Mar 18. Epub 2019 Mar 18.

Department of Electrical and Electronic Engineering, Yonsei University, Seoul, Republic of Korea.

Background: FLAIR (fluid attenuated inversion recovery) imaging via synthetic MRI methods leads to artifacts in the brain, which can cause diagnostic limitations. The main sources of the artifacts are attributed to the partial volume effect and flow, which are difficult to correct by analytical modeling. In this study, a deep learning (DL)-based synthetic FLAIR method was developed, which does not require analytical modeling of the signal. Read More

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https://onlinelibrary.wiley.com/doi/abs/10.1002/jmri.26712
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http://dx.doi.org/10.1002/jmri.26712DOI Listing
March 2019
3 Reads

MRI of acute appendicitis.

J Magn Reson Imaging 2019 Mar 18. Epub 2019 Mar 18.

University of North Carolina Department of Radiology, Division of Abdominal Imaging, Chapel Hill, North Carolina, USA.

Appendicitis is the most common cause of acute abdominal pain resulting in surgery. While historically ultrasound (US) and computed tomography (CT) have been used to evaluate for appendicitis and its related complications, magnetic resonance imaging (MRI) has become a highly accurate and increasingly utilized modality in the last two decades, particularly in the pediatric and pregnant patient populations in whom ionizing radiation is used reluctantly. This article discusses the advantages and disadvantages of MRI as a modality to evaluate for acute appendicitis, summarizes studies of the diagnostic performance relative to CT and US, provides a standard MR protocol, and describes MRI findings typical of acute appendicitis, common complications, and other differential diagnoses. Read More

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http://dx.doi.org/10.1002/jmri.26709DOI Listing
March 2019
2 Reads

Investigating GABA concentrations measured with macromolecule suppressed and unsuppressed MEGA-PRESS MR spectroscopy and their relationship with BOLD responses in the occipital cortex.

J Magn Reson Imaging 2019 Mar 14. Epub 2019 Mar 14.

Institute for Brain Research and Rehabilitation, South China Normal University, Guangzhou, China.

Background: A combination of magnetic resonance spectroscopy (MRS) and functional (f)MRI is a promising method for studying brain activity. Negative results have, however, produced uncertainty as to the validity of the approach. Using a MEGA-PRESS sequence adapted to suppress the macromolecule signal (GABA-) has been suggested as a key methodological improvement, but there is some doubt as to the relationship between such estimates and those from the standard sequence (GABA+), making interpretation difficult. Read More

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http://dx.doi.org/10.1002/jmri.26706DOI Listing
March 2019
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Techniques for minimizing sedation in pediatric MRI.

J Magn Reson Imaging 2019 Mar 14. Epub 2019 Mar 14.

Department of Diagnostic Imaging and Radiology, Children's National Health Systems, Washington, DC, USA.

MRI is used widely in infants and young children. However, in these young cases deep sedation or general anesthesia is often required to minimize motion artifacts during MRI examinations. Although the benefits of MR typically outweigh the potential risks of sedation when delivered by an experienced team, there are increasing concerns regarding the affect of sedation on young children. Read More

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http://dx.doi.org/10.1002/jmri.26703DOI Listing
March 2019
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Quantitative multivoxel proton MR spectroscopy for the identification of white matter abnormalities in mild traumatic brain injury: Comparison between regional and global analysis.

J Magn Reson Imaging 2019 Mar 13. Epub 2019 Mar 13.

Center for Advanced Imaging Innovation and Research (CAI2R), Bernard and Irene Schwartz Center for Biomedical Imaging, New York University School of Medicine, Department of Radiology, New York, New York, USA.

Background: 3D brain proton MR spectroscopic imaging ( H MRSI) facilitates simultaneous metabolic profiling of multiple loci, at higher, sub-1 cm , spatial resolution than single-voxel H MRS with the ability to separate tissue-type partial volume contribution(s).

Purpose: To determine if: 1) white matter (WM) damage in mild traumatic brain injury (mTBI) is homogeneously diffuse, or if specific regions are more affected; 2) partial-volume-corrected, structure-specific H MRSI voxel averaging is sensitive to regional WM metabolic abnormalities.

Study Type: Retrospective cross-sectional cohort study. Read More

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http://doi.wiley.com/10.1002/jmri.26718
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http://dx.doi.org/10.1002/jmri.26718DOI Listing
March 2019
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Early Response Assessment of Glioma Patients to Definitive Chemoradiotherapy Using Chemical Exchange Saturation Transfer Imaging at 7 T.

J Magn Reson Imaging 2019 Mar 12. Epub 2019 Mar 12.

Division of Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany.

Background: Patients with newly diagnosed inoperable glioma receive chemoradiotherapy (CRT). Standard Response Assessment in Neuro-Oncology (RANO) takes a minimum of 4 weeks after the end of treatment.

Purpose/hypothesis: To investigate whether chemical exchange saturation transfer (CEST) MRI enables earlier assessment of response to CRT in glioma patients. Read More

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http://dx.doi.org/10.1002/jmri.26702DOI Listing
March 2019
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An update for LI-RADS: Version 2018. Why so soon after version 2017?

J Magn Reson Imaging 2019 Mar 12. Epub 2019 Mar 12.

Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, Tennessee, USA.

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http://dx.doi.org/10.1002/jmri.26715DOI Listing

Semiautomatic carotid intraplaque hemorrhage volume measurement using 3D carotid MRI.

J Magn Reson Imaging 2019 Mar 12. Epub 2019 Mar 12.

Department of Bioengineering, University of Washington, Seattle, Washington, USA.

Background: Presence of intraplaque hemorrhage (IPH) is a known risk factor for stroke and plaque progression. Accurate and reproducible measurement of IPH volume are required for further risk stratification.

Purpose: To develop a semiautomatic method to measure carotid IPH volume. Read More

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http://dx.doi.org/10.1002/jmri.26698DOI Listing
March 2019
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Age-related deep white matter changes in myelin and water content: A T relaxometry study.

J Magn Reson Imaging 2019 Mar 12. Epub 2019 Mar 12.

Institute of Computer Science, Foundation of Research and Technology, Heraklion, Greece.

Background: According to the retrogenesis hypothesis, the rate of age-related changes in white matter (WM) myelin content varies between early myelinating (parietal, occipital) and late myelinating (prefrontal, lateral-posterior temporal) areas. The multiecho spin echo (MESE), PD-to-T -weighted sequence provides an index of myelin content (myelin water fraction [MWF]) derived from measurements of myelin water (via the short T component [10-50 msec]) and intra- and extracellular water (via the long T component [>50-200 msec]).

Purpose: To assess the shape and regional variations in the rate of age-related myelin and water content changes in deep WM regions using the MESE sequence. Read More

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http://dx.doi.org/10.1002/jmri.26707DOI Listing
March 2019
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Three-dimensional turbo-spin-echo amide proton transfer-weighted mri for cervical cancer: A preliminary study.

J Magn Reson Imaging 2019 Mar 12. Epub 2019 Mar 12.

Department of Radiology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, PR China.

Background: Amide proton transfer-weighted (APTw) imaging has shown great potential in the diagnosis of cancer, but has yet not been well studied in cervical cancer.

Purpose: To evaluate the image quality and clinical feasibility of APTw MRI for cervical cancer.

Study Type: Prospective. Read More

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http://dx.doi.org/10.1002/jmri.26710DOI Listing
March 2019
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Liver fibrosis imaging: A clinical review of ultrasound and magnetic resonance elastography.

J Magn Reson Imaging 2019 Mar 12. Epub 2019 Mar 12.

Liver Imaging Group, Department of Radiology, University of California, San Diego, La Jolla, California, USA.

Liver fibrosis is a histological hallmark of most chronic liver diseases, which can progress to cirrhosis and liver failure, and predisposes to hepatocellular carcinoma. Accurate diagnosis of liver fibrosis is necessary for prognosis, risk stratification, and treatment decision-making. Liver biopsy, the reference standard for assessing liver fibrosis, is invasive, costly, and impractical for surveillance and treatment response monitoring. Read More

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http://dx.doi.org/10.1002/jmri.26716DOI Listing
March 2019
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Measuring Tissue Sodium Concentration: Cross-Vendor Repeatability and Reproducibility of Na-MRI Across Two Sites.

J Magn Reson Imaging 2019 Mar 12. Epub 2019 Mar 12.

Department of Radiology, University of Cambridge, Cambridge, UK.

Background: Sodium MRI ( Na-MRI)-derived biomarkers such as total sodium concentration (TSC) have the potential to provide information on tumor cellularity and the changes in tumor microstructure that occur following therapy.

Purpose: To evaluate the repeatability and reproducibility of TSC measurements in the brains of healthy volunteers, providing evidence for the technical validation of Na-MRI-derived biomarkers.

Study Type: Prospective multicenter study. Read More

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http://dx.doi.org/10.1002/jmri.26705DOI Listing
March 2019
2 Reads