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Journal of Magnetic Resonance Imaging: JMRI

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https://www.readbyqxmd.com/read/29165847/breast-lesion-characterization-using-whole-lesion-histogram-analysis-with-stretched-exponential-diffusion-model
#1
Chunling Liu, Kun Wang, Xiaodan Li, Jine Zhang, Jie Ding, Karl Spuhler, Timothy Duong, Changhong Liang, Chuan Huang
BACKGROUND: Diffusion-weighted imaging (DWI) has been studied in breast imaging and can provide more information about diffusion, perfusion and other physiological interests than standard pulse sequences. The stretched-exponential model has previously been shown to be more reliable than conventional DWI techniques, but different diagnostic sensitivities were found from study to study. PURPOSE: This work investigated the characteristics of whole-lesion histogram parameters derived from the stretched-exponential diffusion model for benign and malignant breast lesions, compared them with conventional apparent diffusion coefficient (ADC), and further determined which histogram metrics can be best used to differentiate malignant from benign lesions...
November 22, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29160020/comparison-of-quantitative-regional-ventilation-weighted-fourier-decomposition-mri-with-dynamic-fluorinated-gas-washout-mri-and-lung-function-testing-in-copd-patients
#2
Till F Kaireit, Marcel Gutberlet, Andreas Voskrebenzev, Julia Freise, Tobias Welte, Jens M Hohlfeld, Frank Wacker, Jens Vogel-Claussen
BACKGROUND: Ventilation-weighted Fourier decomposition-MRI (FD-MRI) has matured as a reliable technique for quantitative measures of regional lung ventilation in recent years, but has yet not been validated in COPD patients. PURPOSE/HYPOTHESIS: To compare regional fractional lung ventilation obtained by ventilation-weighted FD-MRI with dynamic fluorinated gas washout MRI ((19) F-MRI) and lung function test parameters. STUDY TYPE: Prospective study...
November 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29159946/extracellular-volume-with-bolus-only-technique-in-amyloidosis-patients-diagnostic-accuracy-correlation-with-other-clinical-cardiac-measures-and-ability-to-track-changes-in-amyloid-load-over-time
#3
Giulia Zumbo, Sharon V Barton, Douglas Thompson, Min Sun, Amna Abdel-Gadir, Thomas A Treibel, Daniel Knight, Ana Martinez-Naharro, Lane Thirusha, Julian D Gillmore, James C Moon, Philip N Hawkins, Marianna Fontana
BACKGROUND: Extracellular volume (ECV) by T1 mapping requires the contrast agent distribution to be at equilibrium. This can be achieved either definitively with a primed contrast infusion (infusion ECV), or sufficiently with a delay postbolus (bolus-only ECV). For large ECV, the bolus-only approach measures higher than the infusion ECV, causing some uncertainty in diseases such as amyloidosis. PURPOSE: To characterize the relationship between the bolus-only and current gold-standard infusion ECV in patients with amyloidosis...
November 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29159937/diffusion-weighted-mri-and-intravoxel-incoherent-motion-model-for-diagnosis-of-pediatric-solid-abdominal-tumors
#4
Emma M Meeus, Niloufar Zarinabad, Karen A Manias, Jan Novak, Heather E L Rose, Hamid Dehghani, Katharine Foster, Bruce Morland, Andrew C Peet
BACKGROUND: Pediatric retroperitoneal tumors in the renal bed are often large and heterogeneous, and their diagnosis based on conventional imaging alone is not possible. More advanced imaging methods, such as diffusion-weighted (DW) MRI and the use of intravoxel incoherent motion (IVIM), have the potential to provide additional biomarkers that could facilitate their noninvasive diagnosis. PURPOSE: To assess the use of an IVIM model for diagnosis of childhood malignant abdominal tumors and discrimination of benign from malignant lesions...
November 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29159855/b1-artifact-reduction-in-abdominal-dce-mri-using-kt-points-first-clinical-assessment-of-dynamic-rf-shimming-at-3t
#5
Raphaël Tomi-Tricot, Vincent Gras, Franck Mauconduit, François Legou, Nicolas Boulant, Matthias Gebhardt, Dieter Ritter, Berthold Kiefer, Pierre Zerbib, Alain Rahmouni, Alexandre Vignaud, Alain Luciani, Alexis Amadon
BACKGROUND: The excitation inhomogeneity artifact occurring at 3T in the abdomen can lead to dramatic loss of signal and contrast, thereby hampering diagnosis. PURPOSE: To assess excitation homogeneity and image quality achieved by nonselective prototypical kT -points pulses, compared to tailored static RF shimming, in clinical routine on a commercial dual-transmit scanner. STUDY TYPE: Retrospective study with Institutional Review Board approval; informed consent was waived...
November 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29148120/mapping-brown-adipose-tissue-based-on-fat-water-fraction-provided-by-z-spectral-imaging
#6
Alessandro Scotti, Rong-Wen Tain, Weiguo Li, Victoria Gil, Chong Wee Liew, Kejia Cai
BACKGROUND: Brown adipose tissue (BAT) has a great relevance in metabolic diseases and has been shown to be reduced in obesity and insulin resistance patients. Currently, Dixon MRI is used to calculate fat-water fraction (FWF) and differentiate BAT from white adipose tissue (WAT). However, it may fail in areas of phase wrapping and introduce fat-water swapping artifacts. PURPOSE: To investigate the capacity of the Z-spectrum imaging (ZSI) for the identification of BAT in vivo...
November 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29148118/role-of-the-combination-of-fa-and-t2-parameters-as-a-new-diagnostic-method-in-therapeutic-evaluation-of-parkinson-s-disease
#7
Yuan Fang, Tao Zheng, Lanxiang Liu, Dawei Gao, Qinglei Shi, Yanchao Dong, Dan Du
BACKGROUND: Simple diffusion delivery (SDD) has attained good effects with only tiny amounts of drugs. Fractional anisotropy (FA) and relaxation time T2* that indicate the integrity of fiber tracts and iron concentration within brain tissue were used to evaluate the therapeutic effect of SDD. PURPOSE: To evaluate therapeutic effect of SDD in the Parkinson's disease (PD) rat model with FA and T2* parameters. STUDY TYPE: Prospective case-control animal study...
November 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29143404/tool-for-osteoarthritis-risk-prediction-toarp-over-8-years-using-baseline-clinical-data-x-ray-and-mri-data-from-the-osteoarthritis-initiative
#8
Gabby B Joseph, Charles E McCulloch, Michael C Nevitt, Jan Neumann, Alexandra S Gersing, Martin Kretzschmar, Benedikt J Schwaiger, John A Lynch, Ursula Heilmeier, Nancy E Lane, Thomas M Link
BACKGROUND: Osteoarthritis (OA), a multifactorial disease causing joint degeneration, often leads to severe disability. The rising rates of disability highlight the need for implementing preventative measures at early stages of the disease, which would especially benefit subjects at high risk for OA development. PURPOSE: To develop a risk prediction tool for moderate-severe OA (TOARP) over 8 years based on subject characteristics, knee radiographs, and MRI data at baseline using data from the Osteoarthritis Initiative (OAI)...
November 16, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29140606/mr-textural-analysis-on-t2-flair-images-for-the-prediction-of-true-oligodendroglioma-by-the-2016-who-genetic-classification
#9
Wenting Rui, Yan Ren, Yin Wang, Xinyi Gao, Xiao Xu, Zhenwei Yao
BACKGROUND: The genetic status of 1p/19q is important for differentiating oligodendroglioma, isocitrate-dehydrogenase (IDH)-mutant, and 1p/19q-codeleted from diffuse astrocytoma, IDH-mutant according to the 2016 World Health Organization (WHO) criteria. PURPOSE: To assess the value of magnetic resonance textural analysis (MRTA) on T2 fluid-attenuated inversion recovery (FLAIR) images for making a genetically integrated diagnosis of true oligodendroglioma by WHO guidelines...
November 15, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29140576/comparison-between-qualitative-and-quantitative-assessment-of-background-parenchymal-enhancement-on-breast-mri
#10
Akshat C Pujara, Artem Mikheev, Henry Rusinek, Yiming Gao, Chloe Chhor, Kristine Pysarenko, Harikrishna Rallapalli, Jerzy Walczyk, Melanie Moccaldi, James S Babb, Amy N Melsaether
BACKGROUND: Potential clinical implications of the level of background parenchymal enhancement (BPE) on breast MRI are increasing. Currently, BPE is typically evaluated subjectively. Tests of concordance between subjective BPE assessment and computer-assisted quantified BPE have not been reported. PURPOSE OR HYPOTHESIS: To compare subjective radiologist assessment of BPE with objective quantified parenchymal enhancement (QPE). STUDY TYPE: Cross-sectional observational study...
November 15, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29135086/can-mr-enterography-screen-for-perianal-disease-in-pediatric-inflammatory-bowel-disease
#11
Zehour AlSabban, Nicholas Carman, Rahim Moineddin, Ryan T Lo, Sebastian K King, Jacob C Langer, Thomas D Walters, Anne M Griffiths, Peter C Church, Mary-Louise C Greer
BACKGROUND: Pediatric Crohn's disease is associated with perianal disease (PAD). Magnetic resonance enterography (MRE) assesses small bowel involvement in pediatric inflammatory bowel disease (PIBD). Pelvic MRI (P-MRI) is the gold standard for assessing PAD. PURPOSE: To determine if MRE can accurately detect PAD in PIBD, distinguishing perianal fistulae (PAF) from perianal abscesses (PAA), referenced against P-MRI. STUDY TYPE: Retrospective...
November 14, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29135073/prostate-cancer-detection-using-quantitative-t2-and-t2-weighted-imaging-the-effects-of-5-alpha-reductase-inhibitors-in-men-on-active-surveillance
#12
Francesco Giganti, Giulio Gambarota, Caroline M Moore, Nicola L Robertson, Neil McCartan, Charles Jameson, Simon R J Bott, Mathias Winkler, Brandon Whitcher, Ramiro Castro-Santamaria, Mark Emberton, Clare Allen, Alex Kirkham
BACKGROUND: T2 -weighted imaging (T2 -WI) information has been used in a qualitative manner in the assessment of prostate cancer. Quantitative derivatives (T2 relaxation time) can be generated from T2 -WI. These outputs may be useful in helping to discriminate clinically significant prostate cancer from background signal. PURPOSE/HYPOTHESIS: To investigate changes in quantitative T2 parameters in lesions and noncancerous tissue of men on active surveillance for prostate cancer taking dutasteride 0...
November 14, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29135072/measuring-human-placental-blood-flow-with-multidelay-3d-grase-pseudocontinuous-arterial-spin-labeling-at-3t
#13
Xingfeng Shao, Dapeng Liu, Thomas Martin, Teresa Chanlaw, Sherin U Devaskar, Carla Janzen, Aisling M Murphy, Daniel Margolis, Kyunghyun Sung, Danny J J Wang
BACKGROUND: Placenta influences the health of both a woman and her fetus during pregnancy. Maternal blood supply to placenta can be measured noninvasively using arterial spin labeling (ASL). PURPOSE: To present a multidelay pseudocontinuous arterial spin labeling (pCASL) combined with a fast 3D inner-volume gradient- and spin-echo (GRASE) imaging technique to simultaneously measure placental blood flow (PBF) and arterial transit time (ATT), and to study PBF and ATT evolution with gestational age during the second trimester...
November 14, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29131444/native-t1-reference-values-for-nonischemic-cardiomyopathies-and-populations-with-increased-cardiovascular-risk-a-systematic-review-and-meta-analysis
#14
REVIEW
Maaike van den Boomen, Riemer H J A Slart, Enzo V Hulleman, Rudi A J O Dierckx, Birgitta K Velthuis, Pim van der Harst, David E Sosnovik, Ronald J H Borra, Niek H J Prakken
BACKGROUND: Although cardiac MR and T1 mapping are increasingly used to diagnose diffuse fibrosis based cardiac diseases, studies reporting T1 values in healthy and diseased myocardium, particular in nonischemic cardiomyopathies (NICM) and populations with increased cardiovascular risk, seem contradictory. PURPOSE: To determine the range of native myocardial T1 value ranges in patients with NICM and populations with increased cardiovascular risk. STUDY TYPE: Systemic review and meta-analysis...
November 13, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29112315/reverse-double-inversion-recovery-improving-motion-robustness-of-cardiac-t2-weighted-dark-blood-turbo-spin-echo-sequence
#15
Chenxi Hu, Steffen Huber, Syed R Latif, Guido Santacana-Laffitte, Hamid R Mojibian, Lauren A Baldassarre, Dana C Peters
BACKGROUND: Cardiac dark-blood turbo spin-echo (TSE) imaging is sensitive to through-plane motion, resulting in myocardial signal reduction. PURPOSE: To propose and validate reverse double inversion-recovery (RDIR)-a dark-blood preparation with improved motion robustness for the cardiac dark-blood TSE sequence. STUDY TYPE: Prospective. POPULATION: Healthy volunteers (n = 10) and patients (n = 20). FIELD STRENGTH: 1...
November 7, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29105891/aortopulmonary-collateral-flow-quantification-by-mr-at-rest-and-during-continuous-submaximal-exercise-in-patients-with-total-cavopulmonary-connection
#16
Naira Mkrtchyan, Yvonne Frank, Eva Steinlechner, Lenika Calavrezos, Christian Meierhofer, Alfred Hager, Stefan Martinoff, Peter Ewert, Heiko Stern
BACKGROUND: Aortopulmonary collateral flow is considered to have significant impact on the outcome of patients with single ventricle circulation and total cavopulmonary connection (TCPC). There is little information on collateral flow during exercise. PURPOSE: To quantify aortopulmonary collateral flow at rest and during continuous submaximal exercise in clinical patients doing well with TCPC. STUDY TYPE: Prospective, case controlled. POPULATION: Thirteen patients with TCPC (17 (11-37) years) and 13 age and sex-matched healthy controls (18 (11-38) years)...
November 6, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29095543/background-current-role-and-potential-applications-of-radiogenomics
#17
Katja Pinker, Fuki Shitano, Evis Sala, Richard K Do, Robert J Young, Andreas G Wibmer, Hedvig Hricak, Elizabeth J Sutton, Elizabeth A Morris
With the genomic revolution in the early 1990s, medical research has been driven to study the basis of human disease on a genomic level and to devise precise cancer therapies tailored to the specific genetic makeup of a tumor. To match novel therapeutic concepts conceived in the era of precision medicine, diagnostic tests must be equally sufficient, multilayered, and complex to identify the relevant genetic alterations that render cancers susceptible to treatment. With significant advances in training and medical imaging techniques, image analysis and the development of high-throughput methods to extract and correlate multiple imaging parameters with genomic data, a new direction in medical research has emerged...
November 2, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29091314/variable-angle-gray-level-co-occurrence-matrix-analysis-of-t2-relaxation-time-maps-reveals-degenerative-changes-of-cartilage-in-knee-osteoarthritis-oulu-knee-osteoarthritis-study
#18
Arttu Peuna, Joonas Hekkala, Marianne Haapea, Jana Podlipská, Ali Guermazi, Simo Saarakkala, Miika T Nieminen, Eveliina Lammentausta
BACKGROUND: Texture analysis methods based on gray level co-occurrence matrices (GLCM) can be optimized to probe the spatial correspondence information from knee MRI T2 maps and the changes caused by osteoarthritis, and thus possibly leading to a more sensitive characterization of osteoarthritic cartilage. Curvature of the cartilage surfaces combined with the low image resolution in relation to cartilage thickness set special requirements for an effective texture analysis tool. PURPOSE/HYPOTHESIS: To introduce a novel implementation of GLCM algorithm optimized for cartilage texture analysis; to evaluate the performance of the designed algorithm against mean T2 relaxation time analysis; and to identify the most suitable texture features for discerning osteoarthritic subjects and asymptomatic controls...
November 1, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29090500/five-minute-knee-mri-for-simultaneous-morphometry-and-t2-relaxometry-of-cartilage-and-meniscus-and-for-semiquantitative-radiological-assessment-using-double-echo-in-steady-state-at-3t
#19
Akshay S Chaudhari, Marianne S Black, Susanne Eijgenraam, Wolfgang Wirth, Susanne Maschek, Bragi Sveinsson, Felix Eckstein, Edwin H G Oei, Garry E Gold, Brian A Hargreaves
BACKGROUND: Biomarkers for assessing osteoarthritis activity necessitate multiple MRI sequences with long acquisition times. PURPOSE: To perform 5-minute simultaneous morphometry (thickness/volume measurements) and T2 relaxometry of both cartilage and meniscus, and semiquantitative MRI Osteoarthritis Knee Scoring (MOAKS). STUDY TYPE: Prospective. SUBJECTS: Fifteen healthy volunteers for morphometry and T2 measurements, and 15 patients (five each Kellgren-Lawrence grades 0/2/3) for MOAKS assessment...
November 1, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29086454/pulmonary-ventilation-imaging-in-asthma-and-cystic-fibrosis-using-oxygen-enhanced-3d-radial-ultrashort-echo-time-mri
#20
Wei Zha, Stanley J Kruger, Kevin M Johnson, Robert V Cadman, Laura C Bell, Fang Liu, Andrew D Hahn, Michael D Evans, Scott K Nagle, Sean B Fain
BACKGROUND: A previous study demonstrated the feasibility of using 3D radial ultrashort echo time (UTE) oxygen-enhanced MRI (UTE OE-MRI) for functional imaging of healthy human lungs. The repeatability of quantitative measures from UTE OE-MRI needs to be established prior to its application in clinical research. PURPOSE: To evaluate repeatability of obstructive patterns in asthma and cystic fibrosis (CF) with UTE OE-MRI with isotropic spatial resolution and full chest coverage...
October 31, 2017: Journal of Magnetic Resonance Imaging: JMRI
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