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https://www.readbyqxmd.com/read/29327374/dynamic-coronary-mr-angiography-in-a-pig-model-with-hyperpolarized-water
#1
Kasper Wigh Lipsø, Esben Søvsø Szocska Hansen, Rasmus Stilling Tougaard, Christoffer Laustsen, Jan Henrik Ardenkjaer-Larsen
PURPOSE: To investigate dynamic coronary MR angiography using hyperpolarized water as a positive contrast agent. Hyperpolarization can increase the signal by several orders of magnitude, and has recently been translated to human cardiac application. The aim was to achieve large 1 H signal enhancement to allow high-resolution imaging of the coronary arteries. METHODS: Protons in D2 O were hyperpolarized by dissolution dynamic nuclear polarization. A total of 18 mL of hyperpolarized water was injected into the coronary arteries of healthy pigs (N = 9; 3 injections in 3 animals)...
January 12, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29325210/a-new-co-p-nanocomposite-with-ultrahigh-relaxivity-for-in-vivo-magnetic-resonance-imaging-guided-tumor-eradication-by-chemo-photothermal-synergistic-therapy
#2
Jianhua Liu, Longhai Jin, Yinghui Wang, Xing Ding, Songtao Zhang, Shuyan Song, Daguang Wang, Hongjie Zhang
Design of new nanoagents that intrinsically have both diagnostic imaging and therapeutic capabilities is highly desirable for personalized medicine. In this work, a novel nanotheranostic agent is fabricated based on polydopamine (PDA)-functionalized Co-P nanocomposites (Co-P@PDA) for magnetic resonance imaging (MRI)-guided combined photothermal therapy and chemotherapy. The ultrahigh relaxivity of 224.61 mm-1 s-1 can enable Co-P@PDA to be applied as an excellent contrast agent for MRI in vitro and in vivo, providing essential and comprehensive information for tumor clinical diagnosis...
January 11, 2018: Small
https://www.readbyqxmd.com/read/29323363/high-efficiency-x-ray-luminescence-in-eu3-activated-tungstate-nanoprobes-for-optical-imaging-through-energy-transfer-sensitization
#3
Tao Guo, Yan Lin, Wei-Jian Zhang, Jin-Sheng Hong, Ru-Hui Lin, Xiao-Ping Wu, Juan Li, Chun-Hua Lu, Huang-Hao Yang
X-ray luminescence optical imaging has been recognized as a powerful technique for medical diagnosis due to its deep penetration and low auto-fluorescence in tissues. However, the low luminescence efficiency of current X-ray luminescence nanoprobes remains a major hurdle for sensitive bioimaging in practical medical applications. Here we present a new kind of energy transfer-sensitized X-ray luminescence nanoprobe (PEG-NaGd(WO4)2:Eu) for highly effective optical bioimaging. Under X-ray excitation, the tungstate host absorbs the X-ray photons and then transfers the energy to the Eu3+ luminescence center, thus enhancing the luminescence efficiency of the nanoprobes for high sensitivity optical in vivo imaging...
January 11, 2018: Nanoscale
https://www.readbyqxmd.com/read/29320888/comparative-studies-with-epr-and-mri-on-the-in-vivo-tissue-redox-status-estimation-using-redox-sensitive-nitroxyl-probes-influence-of-the-choice-of-the-region-of-interest
#4
Ken-Ichiro Matsumoto, James B Mitchell, Murali C Krishna
In vivo decay rates of a nitroxyl contrast agent were estimated by a MR redox imaging (MRRI) technique and compared with the decay rates obtained by the electron paramagnetic resonance spectroscopy (EPRS) and imaging (EPRI). MRRI is a dynamic imaging technique employing T1-weighted pulse sequence, which can visualize a nitroxyl-induced enhancement of signal intensity by T1-weighted contrast. EPR techniques can directly measure the paramagnetic nitroxyl radical. Both the squamous cell carcinoma (SCC) tumor-bearing and normal legs of a female C3H mouse were scanned by T1-weighted SPGR sequence at 4...
January 10, 2018: Free Radical Research
https://www.readbyqxmd.com/read/29318102/extending-the-scope-of-19f-hyperpolarization-through-signal-amplification-by-reversible-exchange-in-mri-and-nmr-spectroscopy
#5
Alexandra M Olaru, Thomas B R Robertson, Jennifer S Lewis, Alex Antony, Wissam Iali, Ryan E Mewis, Simon B Duckett
Fluorinated ligands have a variety of uses in chemistry and industry, but it is their medical applications as 18F-labelled positron emission tomography (PET) tracers where they are most visible. In this work, we illustrate the potential of using 19F-containing ligands as future magnetic resonance imaging (MRI) contrast agents and as probes in magnetic resonance spectroscopy studies by significantly increasing their magnetic resonance detectability through the signal amplification by reversible exchange (SABRE) hyperpolarization method...
January 2018: ChemistryOpen
https://www.readbyqxmd.com/read/29317433/improved-evaluation-of-antivascular-cancer-therapy-using-constrained-tracer-kinetic-modeling-for-multi-agent-dynamic-contrast-enhanced-mri
#6
Stefanie Hectors, Igor Jacobs, Jasper Lok, Johannes Peters, Johan Bussink, Freek J M Hoeben, Henk Keizer, Henk M Janssen, Klaas Nicolay, Matthias Schabel, Gustav Strijkers
Dynamic contrast-enhanced MRI (DCE-MRI) is a promising technique for assessing the response of tumor vasculature to anti-vascular therapies. Multi-agent DCE-MRI employs a combination of low and high molecular weight contrast agents, which potentially improves the accuracy of estimation of tumor hemodynamic and vascular permeability parameters. In this study, we employed multi-agent DCE-MRI to assess changes in tumor hemodynamics and vascular permeability after vascular-disrupting therapy. Multi-agent DCE-MRI (sequential injection of G5 dendrimer, G2 dendrimer, and Gd-DOTA) was performed in tumor-bearing mice before, 2 h and 24 h after treatment with vascular disrupting agent DMXAA or placebo...
January 9, 2018: Cancer Research
https://www.readbyqxmd.com/read/29314345/differentiation-between-vasogenic-edema-and-infiltrative-tumor-in-patients-with-high-grade-gliomas-using-texture-patch-based-analysis
#7
Moran Artzi, Gilad Liberman, Deborah T Blumenthal, Orna Aizenstein, Felix Bokstein, Dafna Ben Bashat
BACKGROUND: High-grade gliomas (HGGs) induce both vasogenic edema and extensive infiltration of tumor cells, both of which present with similar appearance on conventional MRI. Using current radiological criteria, differentiation between these tumoral and nontumoral areas within the nonenhancing lesion area remains challenging. PURPOSE: To use radiomics patch-based analysis, based on conventional MRI, for the classification of the nonenhancing lesion area in patients with HGG into tumoral and nontumoral components...
January 3, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29311709/gadoterate-meglumine-decreases-adc-values-of-breast-lesions-depending-on-the-b-value-combination
#8
Otso Arponen, Mazen Sudah, Anna Sutela, Mikko Taina, Amro Masarwah, Timo Liimatainen, Ritva Vanninen
To retrospectively evaluated the influence of administration of the gadolinium based intravenous contrast agent (G-CA) on apparent diffusion coefficient (ADC) values in ADC maps generated using multiple b value combinations. A total of 106 women underwent bilateral 3.0 T breast MRI. As an internal validation, diffusion-weighted imaging (b values of 0, 200, 400, 600, 800 s/mm2) was performed before and after the G-CA (gadoterate meglumine (0.2 ml/kg, 3 ml/s)). Whole lesion and fibroglandular tissue (FGT) covering region-of-interests (ROIs) were drawn on the b = 800 s/mm2 images; ROIs were then propagated to multiple retrospectively generated ADC maps...
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29311548/author-correction-targeted-gadofullerene-for-sensitive-magnetic-resonance-imaging-and-risk-stratification-of-breast-cancer
#9
Zheng Han, Xiaohui Wu, Sarah Roelle, Chuheng Chen, William P Schiemann, Zheng-Rong Lu
In the original version of this Article, the penultimate sentence of the Abstract incorrectly read 'The dose of the contrast agent for effective molecular MRI is only slightly lower than that of ZD2-Cy5.5 (0.5 µmol kg-1) in fluorescence imaging.' The correct version states 'higher' in place of 'lower'. This error has been corrected in both the PDF and HTML versions of the Article.
January 8, 2018: Nature Communications
https://www.readbyqxmd.com/read/29300915/in-vivo-identification-of-thick-thin-and-pale-stripes-of-macaque-area-v2-using-submillimeter-resolution-f-mri-at-3-t
#10
Xiaolian Li, Qi Zhu, Thomas Janssens, John T Arsenault, Wim Vanduffel
Primate area V2 contains a repetitive pattern of thick, thin and pale cytochrome oxidase stripes that are characterized by largely discrete in- and output channels, as well as differences in function, and myelo- and cytoarchitecture. Stripes have been identified mainly using microscope-based imaging of tiny portions of superficially located V2, or by postmortem methods, hence, the quest for (quasi) noninvasive tools to study these mesoscale functional units. Only recently, stripe-like V2 patterns have been demonstrated in humans with high-field (functional) magnetic resonance imaging (f)MRI, but in both such studies only 2 stripe compartments could be identified...
December 28, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29300175/comparison-of-arterial-input-functions-measured-from-ultra-fast-dynamic-contrast-enhanced-mri-and-dynamic-contrast-enhanced-computed-tomography-in-prostate-cancer-patients
#11
Shiyang Wang, Zheng Feng Feng Lu, Xiaobing Fan, Milica Medved, Xia Jiang, Steffen Sammet, Ambereen Yousuf, Federico Pineda, Aytekin Oto, Gregory S Karczmar
The purpose of this study was to evaluate the accuracy of arterial input functions (AIFs) measured from dynamic contrast enhanced (DCE) MRI following a low dose of contrast media injection. The AIFs measured from DCE computed tomography (CT) were used as 'gold standard'. Total twenty patients received CT and MRI scans on the same day. Patients received 120mL Iohexol in DCE-CT and a low dose of (0.015mM/kg) of gadobenate dimeglumine in DCE-MRI. The AIFs were measured in the iliac artery and normalized to the CT and MRI contrast agent doses...
January 4, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29296980/hybrid-fept-sio2-au-nanoparticles-as-a-theranostic-tool-in-vitro-photo-thermal-treatment-and-mri-imaging
#12
N Kostevšek, I Abramovič, S Hudoklin, M E Kreft, I Serša, A Sepe, J Vidmar, S Šturm, M Spreitzer, J Ščančar, S Kobe, K Žužek Rožman
We have produced an innovative, theranostic material based on FePt/SiO2/Au hybrid nanoparticles (NPs) for both, photo-thermal therapy and magnetic resonance imaging (MRI). Furthermore, a new synthesis approach, i.e., Au double seeding, for the preparation of Au nanoshells around the FePt/SiO2 cores, is proposed. The photo-thermal and the MRI response were first demonstrated on an aqueous suspension of hybrid FePt/SiO2/Au NPs. The cytotoxicity together with the internalization mechanism and the intracellular fate of the hybrid NPs were evaluated in vitro on a normal (NPU) and a half-differentiated cancerous cell line (RT4)...
January 3, 2018: Nanoscale
https://www.readbyqxmd.com/read/29291165/construction-of-multifunctional-fe3o4-mtx-hbc-nanoparticles-for-mr-imaging-and-photothermal-therapy-chemotherapy
#13
Qiang Zhang, Wenjun Shan, Chaochao Ai, Zhiwei Chen, Tiantian Zhou, Xiaolin Lv, Xi Zhou, Shefang Ye, Lei Ren, Xiumin Wang
To accomplish effective cancer imaging and integrated therapy, the multifunctional nanotheranostic Fe3O4-MTX@HBc core-shell nanoparticles (NPs) were designed. A straightforward method was demonstrated for efficient encapsulation of magnetic NPs into the engineered virus-like particles (VLPs) through the affinity of histidine tags for the methotrexate (MTX)-Ni2+ chelate. HBc144-His VLPs shell could protect Fe3O4-MTX NPs from the recognition by the reticuloendothelial system as well as could increase their cellular uptake efficiency...
2018: Nanotheranostics
https://www.readbyqxmd.com/read/29290795/tumor-penetrating-peptide-conjugated-and-doxorubicin-loaded-t1-t2-dual-mode-mri-contrast-agents-nanoparticles-for-tumor-theranostics
#14
Lipeng Gao, Jing Yu, Yang Liu, Jinge Zhou, Lei Sun, Jing Wang, Jianzhong Zhu, Hui Peng, Weiyue Lu, Lei Yu, Zhiqiang Yan, Yiting Wang
The conventional chemotherapeutics could not be traced in vivo and provide timely feedback on the clinical effectiveness of drugs. Methods: In this study, a tumor-penetrating peptide RGERPPR (RGE) modified, Gd-DTPA conjugated, and doxorubicin (DOX) loaded Fe3O4@SiO2@mSiO2 nanoparticle drug delivery system (Fe3O4@SiO2@mSiO2/DOX-(Gd-DTPA)-PEG-RGE NPs) was prepared for tumor theranostics. Results: The Fe3O4@SiO2@mSiO2/DOX-(Gd-DTPA)-PEG-RGE NPs showed a z-average hydrodynamic diameter of about 90 nm, and a pH-sensitive DOX release profile...
2018: Theranostics
https://www.readbyqxmd.com/read/29290280/nanomedicine-an-emerging-therapeutic-strategy-for-oral-cancer-therapy
#15
REVIEW
Sabrina Marcazzan, Elena Maria Varoni, Elvin Blanco, Giovanni Lodi, Mauro Ferrari
Oral cavity and oropharyngeal carcinomas (oral cancer) represents a significant cause of morbidity and mortality. Despite efforts in improving early diagnosis and treatment, the 5-year survival rate of advanced stage of the disease is less than 63%. The field of nanomedicine has offered promising diagnostic and therapeutic advances in cancer. Indeed, several platforms have been clinically approved for cancer therapy, while other promising systems are undergoing exploration in clinical trials. With its ability to deliver drugs, nucleic acids, and MRI contrast agents with high efficiency, nanomedicine platforms offer the potential to improve drug efficacy and tolerability...
January 2018: Oral Oncology
https://www.readbyqxmd.com/read/29288036/a-study-of-mri-gradient-echo-signals-from-discrete-magnetic-particles-with-considerations-of-several-parameters-in-simulations
#16
Paul Kokeny, Yu-Chung N Cheng, He Xie
Modeling MRI signal behaviors in the presence of discrete magnetic particles is important, as magnetic particles appear in nanoparticle labeled cells, contrast agents, and other biological forms of iron. Currently, many models that take into account the discrete particle nature in a system have been used to predict magnitude signal decays in the form of R2* or R2' from one single voxel. Little work has been done for predicting phase signals. In addition, most calculations of phase signals rely on the assumption that a system containing discrete particles behaves as a continuous medium...
December 26, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29287105/effect-of-intra-articular-administration-of-superparamagnetic-iron-oxide-nanoparticles-spions-for-mri-assessment-of-the-cartilage-barrier-in-a-large-animal-model
#17
Raphael Labens, Carola Daniel, Sarah Hall, Xin-Rui Xia, Tobias Schwarz
Early diagnosis of cartilage disease at a time when changes are limited to depletion of extracellular matrix components represents an important diagnostic target to reduce patient morbidity. This report is to present proof of concept for nanoparticle dependent cartilage barrier imaging in a large animal model including the use of clinical magnetic resonance imaging (MRI). Conditioned (following matrix depletion) and unconditioned porcine metacarpophalangeal cartilage was evaluated on the basis of fluorophore conjugated 30 nm and 80 nm spherical gold nanoparticle permeation and multiphoton laser scanning and bright field microscopy after autometallographic particle enhancement...
2017: PloS One
https://www.readbyqxmd.com/read/29285698/dynamics-and-sources-of-pharmaceutically-active-compounds-in-a-coastal-mediterranean-river-during-heavy-rains
#18
Brice Reoyo-Prats, Dominique Aubert, Amélie Sellier, Benoit Roig, Carmen Palacios
Concentrations of pharmaceutically active compounds (PACs) in freshwater systems depend on numerous factors such as land use and hydrometeorological conditions. In the Mediterranean, heavy rain events are of particular importance as they highly influence the concentration of micropollutants found in freshwater and are a source of recurrent first foul flushes due to combined sewer overflows (CSOs). In this study, we seek to assess the dynamics of pharmaceuticals during storm events in coastal Mediterranean rivers at a fine scale and to determine their contribution to multicontamination phenomena owing to CSOs...
December 28, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29279295/financial-implications-of-revised-acr-guidelines%C3%A2-for-estimated-glomerular-filtration-rate%C3%A2-testing-before-contrast-enhanced-mri
#19
Prasad R Shankar, Kushal Parikh, Matthew S Davenport
PURPOSE: To quantify the financial implications of eliminating the need for renal function screening before contrast-enhanced MRI. METHODS: A HIPAA-complaint, institutional review board-exempt retrospective analysis was conducted of all MRI examinations performed at our quaternary care center over a 12-month period (41,336 examinations; 28,970 with contrast). Examination volume-related data, labor costs, and material costs were assessed and applied to a base case model...
December 23, 2017: Journal of the American College of Radiology: JACR
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
#20
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
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