keyword
MENU ▼
Read by QxMD icon Read
search

Synthetic mri

keyword
https://www.readbyqxmd.com/read/29305739/quantitative-inversion-time-prescription-for-myocardial-late-gadolinium-enhancement-using-t1-mapping-based-synthetic-inversion-recovery-imaging-reducing-subjectivity-in-the-estimation-of-inversion-time
#1
Sebastian Gassenmaier, Rob J van der Geest, U Joseph Schoepf, Pal Suranyi, Wolfgang G Rehwald, Carlo N De Cecco, Domenico Mastrodicasa, Moritz H Albrecht, Domenico De Santis, Virginia W Lesslie, Balazs Ruzsics, Akos Varga-Szemes
To develop a quantitative T1-mapping-based synthetic inversion recovery (IRsynth) approach to calculate the optimal inversion time (TI0) for late gadolinium enhancement (LGE) imaging. Prospectively enrolled patients (n = 130, 58 ± 16 years) underwent cardiac MRI on a 1.5T system including Look-Locker TI-scout (LL), modified LL IR (MOLLI)-based T1-mapping, and LGE acquisitions. Patients were randomized into two groups: LL group (TI-scout followed T1-mapping) or MOLLI group (T1-mapping followed TI-scout)...
January 5, 2018: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29288410/central-nervous-system-involvement-in-rheumatoid-arthritis-possible-role-of-chronic-inflammation-and-tnf-blocker-therapy
#2
Sinem Sağ, Mustafa Serdar Sağ, Ibrahim Tekeoğlu, Ayhan Kamanlı, Kemal Nas, Bilgehan Atilgan Acar
Rheumatoid arthritis (RA) is a chronic disease, the etiology of which has yet to be clarified, which causes activation of proinflammatory pathways that bring about joint and systemic inflammation. Although peripheral nervous system anomalies are observed widely in RA, very few case reports on changes in the central nervous system (CNS) have been published. In recent years, the pathophysiology of CNS involvement that can occur in RA has attracted a great deal of attention. Emphasis has focused on the possibility that CNS involvement occurs due to blood-brain barrier (BBB) damage associated with chronic inflammation...
December 29, 2017: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/29277987/bioinspired-manganese-chelated-alginate-poly-dopamine-nanomaterials-for-efficient-in-vivo-t1%C3%A2-weighted-magnetic-resonance-imaging-mri
#3
Kefyalew Dagnew Addisu, Balkew Zewge Hailemeskel, Shewaye Lakew Mekuria, Abegaz Tizazu Andrgie, Yu-Chun Lin, Hsieh-Chih Tsai
Manganese-based nanomaterials are an emerging new class of magnetic resonance imaging (MRI) contrast agents (CAs) that provide impressive contrast abilities. MRI CAs that can respond to pathophysiological parameters like pH or redox potential are also highly demanded for MRI guided tumor diagnosis. Until now, synthesizing nanomaterials with good biocompatibility, physio-chemical stability, and good contrast effects remain challenging. This study investigated two new systems of calcium/manganese cations complexed with either alginate-polydopamine or alginate-dopamine nanogels (AlgPDA(Ca/Mn) NG or AlgDA (Ca/Mn) NG)...
December 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29238005/the-advantage-of-synthetic-mri-for-the-visualization-of-anterior-temporal-pole-lesions-on-double-inversion-recovery-dir-phase-sensitive-inversion-recovery-psir-and-myelin-images-in-a-patient-with-cadasil
#4
Lauren Wallaert, Akifumi Hagiwara, Christina Andica, Masaaki Hori, Kazuo Yamashiro, Saori Koshino, Tomoko Maekawa, Koji Kamagata, Shigeki Aoki
No abstract text is available yet for this article.
December 12, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29236132/brentuximab-vedotin-maintenance-following-chemotherapy-without-irradiation-for-primary-intracranial-embryonal-carcinoma-in-down-syndrome
#5
Mohammad H Abu Arja, Suzanne E Conley, Violeta Salceda, Fahd Al-Sufiani, Daniel R Boué, Jonathan L Finlay
BACKGROUND: Germ cell tumors (GCT) are the most common central nervous system (CNS) tumors in individuals with Down syndrome. Patients with Down syndrome treated with CNS irradiation are at increased risk of developing cerebrovascular complications such as moyamoya disease. Embryonal carcinoma components are recognized to be more resistant to conventional chemotherapy and radiotherapy and confer a very poor prognosis. CD30 is a member of the tumor necrosis factor-receptor superfamily...
December 13, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29216423/nanoparticle-functionalization-with-platelet-membrane-enables-multi-factored-biological-targeting-and-detection-of-atherosclerosis
#6
Xiaoli Wei, Man Ying, Diana Dehaini, Yuanyuan Su, Ashley V Kroll, Jiarong Zhou, Weiwei Gao, Ronnie H Fang, Shu Chien, Liangfang Zhang
Cardiovascular disease represents one of the major causes of death across the global population. Atherosclerosis, one of its most common drivers, is characterized by the gradual build-up of arterial plaque over time, which can ultimately lead to life-threatening conditions. Given the impact of the disease on public health, there is a great need for effective and noninvasive imaging modalities that can provide valuable information on its biological underpinnings during development. Here, we leverage the role of platelets in atherogenesis to design nanocarriers capable of targeting multiple biological elements relevant to plaque development...
December 7, 2017: ACS Nano
https://www.readbyqxmd.com/read/29214978/characterization-of-dynamic-changes-of-current-source-localization-based-on-spatiotemporal-fmri-constrained-eeg-source-imaging
#7
Thinh Nguyen, Thomas Potter, Robert Grossman, Yingchun Zhang
OBJECTIVE: Neuroimaging has been employed as a promising approach to advance our understanding of brain networks in both basic and clinical neuroscience. Electroencephalography (EEG) and functional Magnetic Resonance Imaging (fMRI) represent two neuroimaging modalities with complementary features; EEG has high temporal resolution and low spatial resolution while fMRI has high spatial resolution and low temporal resolution. Multimodal EEG inverse methods have attempted to capitalize on these properties but have been subjected to localization error...
December 7, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29210434/nano-confinement-driven-enhanced-magnetic-relaxivity-of-spions-for-targeted-tumor-bioimaging
#8
Tuyen Duong Thanh Nguyen, Arunkumar Pitchaimani, Colin Ferrel, Ravindra Thakkar, Santosh Aryal
Superparamagnetic iron oxide nanoparticles (SPIONs) are highly biocompatible and have a versatile synthetic technique based on coprecipitation, reduction-precipitation, and hydrothermal methods, where Fe3+ and Fe2+ react in aqueous solutions; both these ions are present in our body and have clear metabolic pathways; therefore, they have attracted extensive research interest and development in the field of diagnostic imaging and therapy. However, most SPION-based clinical diagnostic contrast agents are discontinued due to severe pain, low transverse magnetic relaxivity range of 80-180 mM-1 s-1, shorter circulation half-life, and lack of disease specificity...
December 6, 2017: Nanoscale
https://www.readbyqxmd.com/read/29210075/noise-contamination-from-pet-blood-sampling-pump-effects-on-structural-mri-image-quality-in-simultaneous-pet-mr-studies
#9
Elizabeth Bartlett, Christine DeLorenzo, Ramin Parsey, Chuan Huang
PURPOSE: To fully quantify PET imaging outcome measures, a blood-sampling pump is often used during the PET acquisition. With simultaneous PET/MR studies, a structural magnetization-prepared rapid gradient-echo (MP-RAGE) may also be acquired while the pump is generating electromagnetic noise. This study investigated whether this noise contamination would be detrimental to the quantification of volume and cortical thickness measures obtained from automated segmentation of the MP-RAGE image...
December 6, 2017: Medical Physics
https://www.readbyqxmd.com/read/29209194/a-heavy-tailed-expectation-maximization-hidden-markov-random-field-model-with-applications-to-segmentation-of-mri
#10
Diego Castillo-Barnes, Ignacio Peis, Francisco J Martínez-Murcia, Fermín Segovia, Ignacio A Illán, Juan M Górriz, Javier Ramírez, Diego Salas-Gonzalez
A wide range of segmentation approaches assumes that intensity histograms extracted from magnetic resonance images (MRI) have a distribution for each brain tissue that can be modeled by a Gaussian distribution or a mixture of them. Nevertheless, intensity histograms of White Matter and Gray Matter are not symmetric and they exhibit heavy tails. In this work, we present a hidden Markov random field model with expectation maximization (EM-HMRF) modeling the components using the α-stable distribution. The proposed model is a generalization of the widely used EM-HMRF algorithm with Gaussian distributions...
2017: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/29193250/design-of-universal-parallel-transmit-refocusing-kt-point-pulses-and-application-to-3d-t2-weighted-imaging-at-7t
#11
Vincent Gras, Franck Mauconduit, Alexandre Vignaud, Alexis Amadon, Denis Le Bihan, Tony Stöcker, Nicolas Boulant
PURPOSE: T2 -weighted sequences are particularly sensitive to the radiofrequency (RF) field inhomogeneity problem at ultra-high-field because of the errors accumulated by the imperfections of the train of refocusing pulses. As parallel transmission (pTx) has proved particularly useful to counteract RF heterogeneities, universal pulses were recently demonstrated to save precious time and computational efforts by skipping B1 calibration and online RF pulse tailoring. Here, we report a universal RF pulse design for non-selective refocusing pulses to mitigate the RF inhomogeneity problem at 7T in turbo spin-echo sequences with variable flip angles...
November 29, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29173912/generation-of-synthetic-ct-using-multi-scale-and-dual-contrast-patches-for-brain-mri-only-external-beam-radiotherapy
#12
Souha Aouadi, Ana Vasic, Satheesh Paloor, Tarraf Torfeh, Maeve McGarry, Primoz Petric, Mohamed Riyas, Rabih Hammoud, Noora Al-Hammadi
PURPOSE: To create a synthetic CT (sCT) from conventional brain MRI using a patch-based method for MRI-only radiotherapy planning and verification. METHODS: Conventional T1 and T2-weighted MRI and CT datasets from 13 patients who underwent brain radiotherapy were included in a retrospective study whereas 6 patients were tested prospectively. A new contribution to the Non-local Means Patch-Based Method (NMPBM) framework was done with the use of novel multi-scale and dual-contrast patches...
October 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/29147571/a-surprising-treatment-response-in-a-patient-with-rare-isolated-growth-hormone-deficiency-type-ib
#13
Jordan Yardain Amar, Kimberly Borden, Elizabeth Watson, Talin Arslanian
Isolated Growth Hormone Deficiency (IGHD) is a rare cause of short stature, treated with the standard regimen of subcutaneous synthetic growth hormone (GH). Patients typically achieve a maximum height velocity in the first year of treatment, which then tapers shortly after treatment is stopped. We report a case of a 9-year-old male who presented with short stature (<3rd percentile for age and race). Basal hormone levels showed undetectable serum IGF1. Skeletal wrist age was consistent with chronologic age...
2017: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/29146377/cortical-processing-of-pitch-model-based-encoding-and-decoding-of-auditory-fmri-responses-to-real-life-sounds
#14
REVIEW
Vittoria De Angelis, Federico De Martino, Michelle Moerel, Roberta Santoro, Lars Hausfeld, Elia Formisano
Pitch is a perceptual attribute related to the fundamental frequency (or periodicity) of a sound. So far, the cortical processing of pitch has been investigated mostly using synthetic sounds. However, the complex harmonic structure of natural sounds may require different mechanisms for the extraction and analysis of pitch. This study investigated the neural representation of pitch in human auditory cortex using model-based encoding and decoding analyses of high field (7 T) functional magnetic resonance imaging (fMRI) data collected while participants listened to a wide range of real-life sounds...
November 13, 2017: NeuroImage
https://www.readbyqxmd.com/read/29142336/multi-atlas-based-ct-synthesis-from-conventional-mri-with-patch-based-refinement-for-mri-based-radiotherapy-planning
#15
Junghoon Lee, Aaron Carass, Amod Jog, Can Zhao, Jerry L Prince
Accurate CT synthesis, sometimes called electron density estimation, from MRI is crucial for successful MRI-based radiotherapy planning and dose computation. Existing CT synthesis methods are able to synthesize normal tissues but are unable to accurately synthesize abnormal tissues (i.e., tumor), thus providing a suboptimal solution. We propose a multi-atlas-based hybrid synthesis approach that combines multi-atlas registration and patch-based synthesis to accurately synthesize both normal and abnormal tissues...
February 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/29138536/spotlight-on-siponimod-and-its-potential-in-the-treatment-of-secondary-progressive-multiple-sclerosis-the-evidence-to-date
#16
REVIEW
Alberto Gajofatto
Siponimod (BAF312) is a synthetic molecule belonging to the sphingosine-1-phosphate (S1P) modulator family, which has putative neuroprotective properties and well-characterized immunomodulating effects mediated by sequestration of B and T cells in secondary lymphoid organs. Compared to fingolimod (ie, precursor of the S1P modulators commercially available for the treatment of relapsing-remitting [RR] multiple sclerosis [MS]), siponimod exhibits selective affinity for types 1 and 5 S1P receptor, leading to a lower risk of adverse events that are mainly induced by S1P3 receptor activation, such as bradycardia and vasoconstriction...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/29137497/optimization-of-t2-weighted-imaging-for-shoulder-magnetic-resonance-arthrography-by-synthetic-magnetic-resonance-imaging
#17
Seung Hyun Lee, Young Han Lee, Seok Hahn, Jaemoon Yang, Ho-Taek Song, Jin-Suck Suh
Background Synthetic magnetic resonance imaging (MRI) allows reformatting of various synthetic images by adjustment of scanning parameters such as repetition time (TR) and echo time (TE). Optimized MR images can be reformatted from T1, T2, and proton density (PD) values to achieve maximum tissue contrast between joint fluid and adjacent soft tissue. Purpose To demonstrate the method for optimization of TR and TE by synthetic MRI and to validate the optimized images by comparison with conventional shoulder MR arthrography (MRA) images...
January 1, 2017: Acta Radiologica
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
#18
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/29134354/conventional-and-synthetic-mri-in-multiple-sclerosis-a-comparative-study
#19
Wolfgang Krauss, Martin Gunnarsson, Margareta Nilsson, Per Thunberg
OBJECTIVES: To compare the assessment of patients with multiple sclerosis (MS) using synthetic and conventional MRI. MATERIALS AND METHODS: Synthetic and conventional axial images were prospectively acquired for 52 patients with diagnosed MS. Quantitative MRI (qMRI) was used for measuring proton density and relaxation times (T1, T2) and then, based on these parameters, synthetic T1W, T2W and FLAIR images were calculated. Image stacks were reviewed blindly, independently and in random order by two radiologists...
November 13, 2017: European Radiology
https://www.readbyqxmd.com/read/29126043/biphasic-bioresorbable-scaffold-trufit-plug%C3%A2-for-the-treatment-of-osteochondral-lesions-of-talus-6-to-8-year-follow-up
#20
Elvira Di Cave, Pierluigi Versari, Fabio Sciarretta, David Luzon, Lorenzo Marcellini
BACKGROUND: The ideal treatment of osteochondral lesions of the talus (OLT) is debatable. The TruFit plug has been investigated as a potential treatment method for osteochondral defects. This is a biphasic scaffold designed to stimulate cartilage and subchondral bone formation. The purpose of this retrospective study was to investigate the long-term functional and MRI outcomes of the TruFit Plug for the treatment of OLT. METHODS: Twelve consecutive patients treated from March 2007 to April 2009 for OLT were evaluated...
December 2017: Foot
keyword
keyword
72563
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"