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https://www.readbyqxmd.com/read/29471287/preoperative-grading-of-glioma-using-dynamic-susceptibility-contrast-mri-relative-cerebral-blood-volume-analysis-of-intra-tumoural-and-peri-tumoural-tissue
#1
Radwa K Soliman, Sara A Gamal, Abdel-Hakeem A Essa, Mostafa H Othman
OBJECTIVES: To assess the usefulness of intra-tumor and peri-tumoral relative cerebral blood volume (rCBV) in preoperative glioma grading. PATIENTS AND METHODS: 21 patients with histopathologically confirmed glioma were included. Imaging was achieved on a 1.5T MRI scanner. Dynamic susceptibility contrast (DSC) MRI was performed using T2* weighted gradient echo-planner imaging (EPI). Multiple regions of interest (ROIs) have been drawn in the hotspots regions, the highest ROI has been selected to represent the rCBV of each intra-tumoral and peri-tumoral regions...
January 8, 2018: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29471276/optimized-phases-for-the-acquisition-of-j-spectra-in-coupled-spin-systems-for-thermally-and-phip-polarized-molecules
#2
S Bussandri, I Prina, R H Acosta, L Buljubasich
We demonstrate that the relative phases in the refocusing pulses of multipulse sequences can compensate for pulse errors and off-resonant effects, which are commonly encountered in J-spectroscopy when CPMG is used for acquisition. The use of supercycles has been considered many times in the past, but always from the view point of time-domain NMR, that is, in an effort to lengthen the decay of the magnetization. Here we use simple spin-coupled systems, in which the quantum evolution of the system can be simulated and contrasted to experimental results...
January 31, 2018: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29470686/a-case-of-stage-ia-pancreatic-ductal-adenocarcinoma-accompanied-with-focal-pancreatitis-demonstrated-by-contrast-enhanced-ultrasonography
#3
Junko Fukuda, Sachiko Tanaka, Nobuko Ishida, Tatsuya Ioka, Kenji Ikezawa, Rena Takakura, Miho Nakao, Kazuyoshi Ohkawa, Kazuhiro Katayama, Shigenori Nagata
A patient with slight dilatation of the main pancreatic duct was followed-up with ultrasonography every 6 months as a high-risk case of pancreatic cancer. Twelve years later, a faint hypoechoic area 13 mm in diameter was first detected on the body of the pancreas. Contrast-enhanced ultrasonography revealed a well-demarcated hypoenhanced area 8 mm in diameter and a hyperenhanced area with an unclear margin. The former was suspected to be a small pancreatic cancer lesion, and the latter to be focal pancreatitis accompanying cancer...
February 22, 2018: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/29470627/value-of-hepatocellular-phase-imaging-after-intravenous-gadoxetate-disodium-for-assessing-hepatic-metastases-from-gastroenteropancreatic-neuroendocrine-tumors-comparison-with-other-mri-pulse-sequences-and-with-extracellular-agent
#4
Sree Harsha Tirumani, Jyothi P Jagannathan, Marta Braschi-Amirfarzan, Lei Qin, Patricia Balthazar, Nikhil H Ramaiya, Atul B Shinagare
OBJECTIVE: To compare hepatocellular phase imaging after intravenous gadoxetate disodium with other MRI pulse sequences and with extracellular agent for assessing hepatic metastases from gastroenteropancreatic neuroendocrine neoplasms (GEP-NEN). MATERIALS AND METHODS: In this IRB-approved, HIPAA-compliant retrospective study, we included 30 patients (15 women, mean age: 58 years, range 44-77 years) with GEP-NEN metastatic to the liver, who underwent MRI with gadoxetate disodium...
February 22, 2018: Abdominal Radiology
https://www.readbyqxmd.com/read/29470364/resistance-training-is-associated-with-higher-bone-mineral-density-among-young-adult-male-distance-runners-independent-of-physiological-factors
#5
Anthony A Duplanty, Danielle E Levitt, David W Hill, Brian K McFarlin, Nancy M DiMarco, Jakob L Vingren
Low bone mineral density (BMD) in male distance runners is common and could be modulated by a host of biomarkers involved in the dynamic balance of bone tissue. In contrast, resistance training can increase BMD; however, the efficacy of resistance training in protecting BMD in distance runners has not been elucidated. OBJECTIVE: To investigate the relationship between resistance training, testosterone and bone metabolism biomarker concentrations, and BMD in young adult male distance runners...
February 20, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29469659/grading-of-oligodendroglial-tumors-of-the-brain-with-apparent-diffusion-coefficient-magnetic-resonance-spectroscopy-and-dynamic-susceptibility-contrast-imaging
#6
Muhammad Atif Naveed, Pradeep Goyal, Ajay Malhotra, Xiang Liu, Sonali Gupta, Manisha Mangla, Rajiv Mangla
Purpose We explored whether advanced magnetic resonance (MR) imaging techniques could grade oligodendrogliomas. Methods Forty patients (age 9-61 years) with oligodendroglial tumors were selected. There were 23 patients with World Health Organization grade II (group 1) and 17 patients with grade III (group 2) tumors. Apparent diffusion coefficient (ADC) maps were calculated by b values of 0 and 1000 s/mm2 . Dynamic susceptibility contrast (DSC) images were obtained during the first pass of a bolus of gadolinium-based contrast...
January 1, 2018: Neuroradiology Journal
https://www.readbyqxmd.com/read/29469038/bacterial-translocation-is-linked-to-increased-intestinal-ifn-%C3%AE-il-4-il-17-and-mucin-2-in-cholestatic-rats
#7
Natali Vega-Magaña, Vidal Delgado-Rizo, Leonel García-Benavides, Susana Del Toro-Arreola, Jorge Segura-Ortega, Adelaida Sara M Zepeda Morales, José Sergio Zepeda-Nuño, Marta Escarra-Senmarti, Jorge Gutiérrez-Franco, Jesse Haramati, Miriam R Bueno-Topete
Background and rationale for the study. Bacterial translocation is an important triggering factor of infection and mortality in cirrhosis. In a rat model using bile duct ligation (BDL), bacterial translocation appears within 24 h after ligation. The dynamic between TH1/TH2/TH17 cytokines and the integrity of the colonic mucosa in the context of cirrhosis is little known. This study aims to determine the link between bacterial translocation and intestinal inflammation in a cholestasis model. Additionally, alterations of the colonic mucus layer and the bacterial load were also addressed...
March 1, 2018: Annals of Hepatology
https://www.readbyqxmd.com/read/29468261/in-vivo-molecular-profiling-of-human-glioma-cross-sectional-observational-study-using-dynamic-susceptibility-contrast-magnetic-resonance-perfusion-imaging
#8
Johann-Martin Hempel, Jens Schittenhelm, Uwe Klose, Benjamin Bender, Georg Bier, Marco Skardelly, Ghazaleh Tabatabai, Salvador Castaneda Vega, Ulrike Ernemann, Cornelia Brendle
PURPOSE: To assess the diagnostic performance of dynamic susceptibility contrast perfusion magnetic resonance perfusion imaging (DSC-MRI) for in vivo human glioma molecular profiling. METHODS: In this study 100 patients with histopathologically confirmed glioma who provided written informed consent were retrospectively assessed between January 2016 and February 2017 in two prospective trials that were approved by the local institutional review board. Cerebral blood volume (CBV) measurements from DSC-MRI were assessed, and histogram parameters of relative CBV (rCBV) results were compared among World Health Organization (WHO) 2016 based histological findings and molecular characteristics...
February 21, 2018: Clinical Neuroradiology
https://www.readbyqxmd.com/read/29468245/protonation-induced-ultrafast-torsional-dynamics-in-9-anthrylbenzimidazole-a-ph-activated-molecular-rotor
#9
Amitabha Nandi, Archana Kushwaha, Dipanwita Das, Rajib Ghosh
We report the photophysical properties and excited state dynamics of 9-anthrylbenzimidazole (ANBI) which exhibits protonation-induced molecular rotor properties. In contrast to the highly emissive behavior of neutral ANBI, protonation of the benzimidazole group of ANBI induces efficient nonradiative deactivation by ultrafast torsional motion around the bond connecting the anthracene and benzimidazole units, as revealed by ultrafast transient absorption and fluorescence spectroscopy. Contrary to viscosity-independent fluorescence of neutral dyes, protonated ANBI is shown to display linear variation of emission yield and lifetime with solvent viscosity...
February 22, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29468059/oxaliplatin-induced-hepatic-sinusoidal-obstruction-syndrome-in-a-patient-with-gastric-cancer-a-case-report
#10
Fang Liu, Xin Cao, Jin Ye, Xiaoli Pan, Xuefeng Kan, Yuhu Song
Oxaliplatin is a platinum-based antineoplastic agent used in cancer chemotherapy. Oxaliplatin-induced hepatic sinusoidal obstruction syndrome (HSOS) has been reported in the context of chemotherapy for liver metastasis of colorectal cancer. However, to the best of our knowledge, there is no report of oxaliplatin-associated HSOS in patients with gastric cancer. The present study reported a patient with gastric cancer who received proximal gastrectomy and oxaliplatin-containing chemotherapy. Contrast-enhanced computed tomography revealed that liver parenchyma appeared heterogeneous and demonstrated hypoattenuation in the portal phase...
March 2018: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/29468040/dominance-of-endozoicomonas-bacteria-throughout-coral-bleaching-and-mortality-suggests-structural-inflexibility-of-the-pocillopora-verrucosa-microbiome
#11
Claudia Pogoreutz, Nils Rädecker, Anny Cárdenas, Astrid Gärdes, Christian Wild, Christian R Voolstra
The importance of Symbiodinium algal endosymbionts and a diverse suite of bacteria for coral holobiont health and functioning are widely acknowledged. Yet, we know surprisingly little about microbial community dynamics and the stability of host-microbe associations under adverse environmental conditions. To gain insight into the stability of coral host-microbe associations and holobiont structure, we assessed changes in the community structure of Symbiodinium and bacteria associated with the coral Pocillopora verrucosa under excess organic nutrient conditions...
February 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29467936/dynamic-changes-in-cd44v-positive-cells-after-preoperative-anti-her2-therapy-and-its-correlation-with-pathologic-complete-response-in-her2-positive-breast-cancer
#12
Teruo Yamauchi, Jose Rodrigo Espinosa Fernandez, Chiyo K Imamura, Hideko Yamauchi, Hiromitsu Jinno, Maiko Takahashi, Yuko Kitagawa, Seigo Nakamura, Bora Lim, Savitri Krishnamurthy, James M Reuben, Diane Liu, Debasish Tripathy, Helen Chen, Naoko Takebe, Hideyuki Saya, Naoto T Ueno
Chemotherapy has been reported to increase the proportion of cancer stem cells (CSCs) and to promote epithelial-mesenchymal transition (EMT) phenotype changes. Anti-HER2 therapy may provide a strategy for eliminating CSC and EMT, which contribute to therapeutic resistance. No study has determined the changes in the quantity or characteristics of CSCs or circulating tumor cells (CTCs) with EMT phenotype during preoperative anti-HER2 therapy, and whether these changes correlate to response to dual anti-HER2 therapy...
January 23, 2018: Oncotarget
https://www.readbyqxmd.com/read/29467827/advanced-imaging-techniques-for-small-bowel-crohn-s-disease-what-does-the-future-hold
#13
REVIEW
Inês Pita, Fernando Magro
Treatment of Crohn's disease (CD) is intrinsically reliant on imaging techniques, due to the preponderance of small bowel disease and its transmural pattern of inflammation. Ultrasound (US), computed tomography (CT) and magnetic resonance imaging (MRI) are the most widely employed imaging methods and have excellent diagnostic accuracy in most instances. Some limitations persist, perhaps the most clinically relevant being the distinction between inflammatory and fibrotic strictures. In this regard, several methodologies have recently been tested in animal models and human patients, namely US strain elastography, shear wave elastography, contrast-enhanced US, magnetization transfer MRI and contrast dynamics in standard MRI...
2018: Therapeutic Advances in Gastroenterology
https://www.readbyqxmd.com/read/29467188/mapping-and-predicting-non-linear-brassica-rapa-growth-phenotypes-based-on-bayesian-and-frequentist-complex-trait-estimation
#14
Robert L Baker, Wen F Leong, Stephen Welch, Cynthia Weinig
Predicting phenotypes based on genotypes and understanding the effects of complex multi-locus traits on plant performance requires a description of the underlying developmental processes, growth trajectories, and their genomic architecture. Using data from Brassica rapa genotypes grown in multiple density settings and seasons, we applied a hierarchical Bayesian Function-Valued Trait (FVT) approach to fit logistic growth curves to leaf phenotypic data (length and width) and characterize leaf development. We found evidence of genetic variation in phenotypic plasticity of rate and duration of leaf growth to growing season...
February 21, 2018: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/29467047/myocardial-stress-perfusion-magnetic-resonance-in-children-with-hypertrophic-cardiomyopathy
#15
Lazaro E Hernandez
BACKGROUND: Microvascular dysfunction in hypertrophic cardiomyopathy has been associated with poor clinical outcome. Several studies have demonstrated a reduced perfusion reserve proportional to the magnitude of the hypertrophy. We investigated the utility of stress perfusion cardiac MRI to detect microvascular dysfunction in children with hypertrophic cardiomyopathy. METHODS: From January 2016 to January 2017, 13 patients, with a mean age of 15.3 years, with hypertrophic cardiomyopathy underwent regadenoson stress perfusion cardiac MRI (1...
February 22, 2018: Cardiology in the Young
https://www.readbyqxmd.com/read/29465798/sexual-conflict-and-ecology-species-composition-and-male-density-interact-to-reduce-male-mating-harassment-and-increase-female-survival
#16
Miguel A Gomez-Llano, Hanna M Bensch, Erik I Svensson
Sexual conflict is a pervasive evolutionary force that can reduce female fitness. Experimental evolution studies in the laboratory might overestimate the importance of sexual conflict since the ecological conditions in such settings typically include only a single species. Here, we experimentally manipulated conspecific male density (high or low) and species composition (sympatric or allopatric) to investigate how ecological conditions affect female survival in a sexually dimorphic insect, the banded demoiselle (Calopteryx splendens)...
February 21, 2018: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/29465714/preeclampsia-induced-by-storkhead-box-1-overexpression-in-mice-induces-intrauterine-growth-restriction-abnormal-ultrasonography-and-blood-oxygenation-level-dependent-mri-signatures
#17
Hélène Collinot, Carmen Marchiol, Isabelle Lagoutte, Franck Lager, Nathalie Siauve, Gwennhael Autret, Daniel Balvay, Gilles Renault, Laurent J Salomon, Daniel Vaiman
BACKGROUND: Preeclampsia is a major hypertensive disease caused by pregnancy, inducing proteinuria and increased blood pressure starting from the second half of pregnancy (early preeclampsia) or near the end of pregnancy (late preeclampsia). Pre-symptomatic diagnosis would allow for therapeutic interventions, such as with low-dose aspirin. Among non-invasive methods to explore organ physiology, Doppler ultrasonography (US) and functional blood oxygenation level-dependent (BOLD) MRI (which do not need radioactive contrast agents such as gadolinium) can be used in pregnant women...
February 20, 2018: Journal of Hypertension
https://www.readbyqxmd.com/read/29465605/a-false-positive-i-131-finding-of-duodenum-diverticulum-in-thyroid-cancer-evaluation-by-spect-ct-a-case-report
#18
Rang Wang, Ke Zhou, Qiuping Fan, Haotian Chen, Chengzhong Fan
RATIONALE: Iodine-131 (I-131) is a sensitive marker for the detection of differentiated thyroid cancer (DTC). I-131 whole-body scintigraphy (WBS) has been used widely in evaluation of DTC patient. However, I-131 WBS exists many false-positive uptake of I-131 because radioiodine uptake can also be seen in healthy tissue or in a variety of benign and malignant non-thyroidal tumors. PATIENT CONCERNS: A 44-year-old woman with a papillary thyroid carcinoma for the purpose of ablation therapy after a total thyroidectomy...
February 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29464985/comparison-of-phase-contrast-mr-and-flow-simulations-for-the-study-of-csf-dynamics-in-the-cervical-spine
#19
Erika Kristina Lindstrøm, Jakob Schreiner, Geir Andre Ringstad, Victor Haughton, Per Kristian Eide, Kent-Andre Mardal
Background Investigators use phase-contrast magnetic resonance (PC-MR) and computational fluid dynamics (CFD) to assess cerebrospinal fluid dynamics. We compared qualitative and quantitative results from the two methods. Methods Four volunteers were imaged with a heavily T2-weighted volume gradient echo scan of the brain and cervical spine at 3T and with PC-MR. Velocities were calculated from PC-MR for each phase in the cardiac cycle. Mean pressure gradients in the PC-MR acquisition through the cardiac cycle were calculated with the Navier-Stokes equations...
January 1, 2018: Neuroradiology Journal
https://www.readbyqxmd.com/read/29464809/mapping-and-characterization-of-positive-and-negative-bold-responses-to-visual-stimulation-in-multiple-brain-regions-at-7t
#20
João Jorge, Patrícia Figueiredo, Rolf Gruetter, Wietske van der Zwaag
External stimuli and tasks often elicit negative BOLD responses in various brain regions, and growing experimental evidence supports that these phenomena are functionally meaningful. In this work, the high sensitivity available at 7T was explored to map and characterize both positive (PBRs) and negative BOLD responses (NBRs) to visual checkerboard stimulation, occurring in various brain regions within and beyond the visual cortex. Recently-proposed accelerated fMRI techniques were employed for data acquisition, and procedures for exclusion of large draining vein contributions, together with ICA-assisted denoising, were included in the analysis to improve response estimation...
February 20, 2018: Human Brain Mapping
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