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https://www.readbyqxmd.com/read/29775320/layered-fluid-structure-and-anomalous-diffusion-under-nanoconfinement
#1
Gerald J Wang, Nicolas G Hadjiconstantinou
Molecular diffusion under nanoconfinement can differ significantly from diffusion in bulk fluids. Using molecular-dynamics simulations and molecular-mechanics arguments, we elucidate the effect of layering at the confining boundaries on the self-diffusion of a simple, single-phase, confined fluid. In particular, we show that anomalous diffusion due to layering is controlled by the degree of layering as quantified by the recently proposed Wall number (Wa), which compares the strength of the wall-fluid interaction to the thermal energy...
May 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29775146/setting-pressure-can-change-the-size-and-shape-of-mri-artifacts-caused-by-adjustable-shunt-valves-a-study-of-the-4-newest-models
#2
Daiki Uchida, Yuki Amano, Hirokazu Nakatogawa, Takayuki Masui, Naoto Ando, Teiji Nakayama, Haruhiko Sato, Tetsuro Sameshima, Tokutaro Tanaka
OBJECTIVE Adjustable shunt valves that have been developed for the management of hydrocephalus all rely on intrinsically magnetic components, and artifacts with these valves on MRI are thus inevitable. The authors have previously reported that the shapes of shunt artifacts differ under different valve pressures with the proGAV 2.0 valve. In the present study the authors compared the size and shape of artifacts at different pressure settings with 4 new-model shunt valves. METHODS The authors attached 4 new models of MRI-resistant shunt valve to the temporal scalp of a healthy volunteer: the proGAV 2...
May 18, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29774894/value-of-diffusion-weighted-imaging-for-monitoring-tissue-change-during-magnetic-resonance-guided-high-intensity-focused-ultrasound-therapy-in-bone-applications-an-ex-vivo-study
#3
Sharon L Giles, Jessica M Winfield, David J Collins, Ian Rivens, John Civale, Gail R Ter Haar, Nandita M deSouza
Background: Magnetic resonance (MR)-guided high-intensity focused ultrasound (HIFU) can palliate metastatic bone pain by periosteal neurolysis. We investigated the value of diffusion-weighted imaging (DWI) for monitoring soft tissue changes adjacent to bone during MR-guided HIFU. We evaluated the repeatability of the apparent diffusion coefficient (ADC) measurement, the temporal evolution of ADC change after sonication, and its relationship with thermal parameters. Methods: Ex-vivo experiments in lamb legs ( n = 8) were performed on a Sonalleve MR-guided HIFU system...
2018: European radiology experimental
https://www.readbyqxmd.com/read/29774783/connecting-the-dots-an-association-between-opioids-and-acute-hippocampal-injury
#4
Jed A Barash, W Andrew Kofke
Acute hippocampal injury represents a relatively rare cause of amnesia. Interestingly however, between 2012 and 2017, 18 patients were reported at hospitals in Massachusetts with sudden-onset amnesia in the setting of complete diffusion-weighted hyperintensity of both hippocampi on magnetic resonance imaging. Notably, 17 of the 18 patients tested positive for opioids or had a recorded history of opioid use. This observation suggests an association between opioids and acute hippocampal injury. With particular attention to the Massachusetts cluster and data on fentanyl and its congeners, the epidemiological and pathophysiological evidence that supports this hypothesis is presented, as are potential underlying mechanisms...
May 18, 2018: Neurocase
https://www.readbyqxmd.com/read/29774398/improved-detection-of-a-tumorous-involvement-of-the-mesorectal-fascia-and-locoregional-lymph-nodes-in-locally-advanced-rectal-cancer-using-dce-mri
#5
Marco Armbruster, Melvin D'Anastasi, Veronika Holzner, Martin E Kreis, Olaf Dietrich, Bernhard Brandlhuber, Anno Graser, Martina Brandlhuber
PURPOSE: The prediction of an infiltration of the mesorectal fascia (MRF) and malignant lymph nodes is essential for treatment planning and prognosis of patients with rectal cancer. The aim of this study was to assess the additional diagnostic value of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) for the detection of a malignant involvement of the MRF and of mesorectal lymph nodes in patients with locally advanced rectal cancer. METHODS: In this prospective study, 22 patients with locally advanced rectal cancer were examined with 1...
May 17, 2018: International Journal of Colorectal Disease
https://www.readbyqxmd.com/read/29774379/-agenesis-of-the-corpus-callosum
#6
REVIEW
J M Lieb, F J Ahlhelm
CLINICAL ISSUE: Agenesis of the corpus callosum is reported to have an incidence of about 1:4000 live births. In 30-45% of cases, genetic etiologies can be identified, e. g., 10% chromosomal anomalies and 20-35% genetic syndromes. Environmental factors like fetal alcohol syndrome are also known to be prone to callosal agenesis. Callosal agenesis can be complete or partial and can be isolated or associated with other central nervous system (CNS) anomalies (e. g., cortical developmental disorders, callosal lipoma, intracranial cysts) or extra-CNS anomalies (e...
May 17, 2018: Der Radiologe
https://www.readbyqxmd.com/read/29774316/dual-phase-adc-modelling-of-breast-masses-in-diffusion-weighted-imaging-comparison-with-histopathologic-findings
#7
Gökhan Ertaş, Can Onaygil, Onur Buğdaycı, Erkin Arıbal
Objective: To investigate the diagnostic value of dual-phase apparent diffusion coefficient (ADC) compared to traditional ADC values in quantitative diffusion-weighted imaging (DWI) for differentiating between benign and malignant breast masses. Materials and Methods: Diffusion-weighted images of pathologically confirmed 88 benign and 85 malignant lesions acquired using a 3.0T MR scanner were analyzed. Small region-of-interests focusing on the highest signal intensity of lesions were used...
April 2018: European Journal of Breast Health
https://www.readbyqxmd.com/read/29774183/quantitative-parameters-of-intravoxel-incoherent-motion-diffusion-weighted-imaging-ivim-dwi-potential-application-in-predicting-pathological-grades-of-pancreatic-ductal-adenocarcinoma
#8
Wanling Ma, Guangwen Zhang, Jing Ren, Qi Pan, Didi Wen, Jinman Zhong, Zhuoli Zhang, Yi Huan
Background: The aim of this study was to compare intravoxel incoherent motion diffusion weighted imaging (IVIM-DWI) parameters such as standard apparent diffusion coefficient (ADCstandard ), pure diffusion coefficient (Dslow ), pseudodiffusion coefficient (Dfast ) and perfusion fraction (ƒ) for differentiating pancreatic ductal adenocarcinoma (PDAC) with different pathological grades. Methods: Institutional Review Board of our hospital approved this study protocol...
April 2018: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29774180/survival-prediction-based-on-qualitative-mri-diffusion-signature-in-patients-with-recurrent-high-grade-glioma-treated-with-bevacizumab
#9
Pradeep Goyal, Mary Tenenbaum, Sonali Gupta, Puneet S Kochar, Alok A Bhatt, Manisha Mangla, Yogesh Kumar, Rajiv Mangla
Background: Bevacizumab was approved by the FDA for the treatment of recurrent or progressive glioblastoma (GBM). Imaging responses are typically assessed by gadolinium-enhanced MRI. We sought to determine the significance of qualitative diffusion signature (manifest as variable degree of dark signal) on ADC maps in recurrent gliomas after treatment with bevacizumab. Methods: We performed an institutional review board (IRB) approved retrospective study on patients who underwent MRI of the brain after 8 weeks of receiving bevacizumab for recurrent glioma...
April 2018: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29773299/diffusion-mri-in-acute-nervous-system-injury
#10
Matthew D Budde, Nathan P Skinner
Diffusion weighted magnetic resonance imaging (DWI) and related techniques such as diffusion tensor imaging (DTI) are uniquely sensitive to the microstructure of the brain and spinal cord. In the acute aftermath of nervous system injury, for example, DWI reveals changes caused by injury that remains invisible on other MRI contrasts such as T2 -weighted imaging. This ability has led to a demonstrated clinical utility in cerebral ischemia. However, despite strong promise in preclinical models and research settings, DWI has not been as readily adopted for other acute injuries such as traumatic spinal cord, brain, or peripheral nerve injury...
April 30, 2018: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29772614/-a-case-of-retroperitoneal-liposarcoma-in-which-magnetic-resonance-imaging-was-useful-in-the-decision-of-resection-of-primary-and-recurrenttumors
#11
Sohei Kuribayashi, Yasutomo Nakai, Hirotaka Tsuji, Satoru Yumiba, Koji Hatano, Masashi Nakayama, Kenichi Kakimoto, Chiaki Kubo, Kazuo Nishimura
A 47-year-old female was referred to our hospital because of retroperitoneal tumor which was detected by computer tomography (CT). Since the tumor was considered to be benign by magnetic resonance imaging (MRI), she was followed by MRI every 3 months. The site of the tumor was gradually increased, and 15 months after presentation, a lesion with high signal intensity on diffusion weighted image (DWI) appeared in the tumor. At that time, we performed tumor resection considering the tumor to be malignant. Pathological diagnosis was dedifferentiated liposarcoma...
April 2018: Hinyokika Kiyo. Acta Urologica Japonica
https://www.readbyqxmd.com/read/29771954/preoperative-prediction-of-microvascular-invasion-of-hepatocellular-carcinoma-with-ivim-diffusion-weighted-mr-imaging-and-gd-eob-dtpa-enhanced-mr-imaging
#12
Wei Zhao, Wenguang Liu, Huaping Liu, Xiaoping Yi, Jiale Hou, Yigang Pei, Hui Liu, Deyun Feng, Liyu Liu, Wenzheng Li
Microvascular invasion (MVI) is regarded as one of the independent risk factors for recurrence and poor prognosis of hepatocellular carcinoma (HCC). The presence of MVI in HCCs was evaluated on the basis of pathological reports of surgical specimens and was defined as tumor within a vascular space lined by endothelium that was visible only on microscopy. The aim of the study was to investigate the usefulness of intravoxel incoherent motion (IVIM) diffusion weighted (DW) magnetic resonance (MR) imaging in predicting MVI of HCC...
2018: PloS One
https://www.readbyqxmd.com/read/29771445/tirofiban-combined-with-rt-pa-intraarterial-thrombolysis-improves-the-recanalization-rate-of-acute-middle-cerebral-artery-occlusion-in-rabbits
#13
Y-J Yu, W Xiong
OBJECTIVE: To investigate the curative effect of tirofiban combined with recombinant tissue-plasminogen activator (rt-PA) selective intra-arterial thrombolysis on acute middle cerebral artery occlusion (MCAO). MATERIALS AND METHODS: A total of 60 adult male Japanese white rabbits weighing 2.5-3.0 kg were selected, and the acute cerebral infarction model was established via autologous thromboembolism of middle cerebral artery. Rabbits were randomly divided into 4 groups: tirofiban group (Ti group, 5 μg/kg, n=15), rt-PA group (rt-PA group, 2 mg/kg, n=15), tirofiban + rt-PA group (Ti + rt-PA group, 3 μg/kg Ti + 1 mg/kg rt-PA, n=15), and control group (Co group, n=15)...
May 2018: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29770848/imaging-biomarkers-from-multiparametric-magnetic-resonance-imaging-are-associated-with-survival-outcomes-in-patients-with-brain-metastases-from-breast-cancer
#14
Bang-Bin Chen, Yen-Shen Lu, Chih-Wei Yu, Ching-Hung Lin, Tom Wei-Wu Chen, Shwu-Yuan Wei, Ann-Lii Cheng, Tiffany Ting-Fang Shih
OBJECTIVES: The aim of this study is to investigate the correlation of survival outcomes with imaging biomarkers from multiparametric magnetic resonance imaging (MRI) in patients with brain metastases from breast cancer (BMBC). METHODS: This study was approved by the institutional review board. Twenty-two patients with BMBC who underwent treatment involving bevacizumab on day 1, etoposide on days 2-4, and cisplatin on day 2 in 21-day cycles were prospectively enrolled for a phase II study...
May 16, 2018: European Radiology
https://www.readbyqxmd.com/read/29766770/mri-guided-thrombolysis-for-stroke-with-unknown-time-of-onset
#15
Götz Thomalla, Claus Z Simonsen, Florent Boutitie, Grethe Andersen, Yves Berthezene, Bastian Cheng, Bharath Cheripelli, Tae-Hee Cho, Franz Fazekas, Jens Fiehler, Ian Ford, Ivana Galinovic, Susanne Gellissen, Amir Golsari, Johannes Gregori, Matthias Günther, Jorge Guibernau, Karl Georg Häusler, Michael Hennerici, André Kemmling, Jacob Marstrand, Boris Modrau, Lars Neeb, Natalia Perez de la Ossa, Josep Puig, Peter Ringleb, Pascal Roy, Enno Scheel, Wouter Schonewille, Joaquin Serena, Stefan Sunaert, Kersten Villringer, Anke Wouters, Vincent Thijs, Martin Ebinger, Matthias Endres, Jochen B Fiebach, Robin Lemmens, Keith W Muir, Norbert Nighoghossian, Salvador Pedraza, Christian Gerloff
Background Under current guidelines, intravenous thrombolysis is used to treat acute stroke only if it can be ascertained that the time since the onset of symptoms was less than 4.5 hours. We sought to determine whether patients with stroke with an unknown time of onset and features suggesting recent cerebral infarction on magnetic resonance imaging (MRI) would benefit from thrombolysis with the use of intravenous alteplase. Methods In a multicenter trial, we randomly assigned patients who had an unknown time of onset of stroke to receive either intravenous alteplase or placebo...
May 16, 2018: New England Journal of Medicine
https://www.readbyqxmd.com/read/29766474/masses-of-developmental-and-genetic-origin-affecting-the-paediatric-craniofacial-skeleton
#16
REVIEW
Salvatore Stefanelli, Pravin Mundada, Anne-Laure Rougemont, Vincent Lenoir, Paolo Scolozzi, Laura Merlini, Minerva Becker
Although rare, masses and mass-like lesions of developmental and genetic origin may affect the paediatric craniofacial skeleton. They represent a major challenge in clinical practice because they can lead to functional impairment, facial deformation and disfigurement. The most common lesions include fibrous dysplasia, dermoid cysts, vascular malformations and plexiform neurofibromas. Less common lesions include torus mandibularis and torus palatinus, cherubism, nevoid basal cell carcinoma syndrome, meningoencephalocele and nasal sinus tract...
May 15, 2018: Insights Into Imaging
https://www.readbyqxmd.com/read/29765059/postnatal-microstructural-developmental-trajectory-of-corpus-callosum-subregions-and-relationship-to-clinical-factors-in-very-preterm-infants
#17
Radhika Teli, Margaret Hay, Alexa Hershey, Manoj Kumar, Han Yin, Nehal A Parikh
Our objectives were to define the microstructural developmental trajectory of six corpus callosum subregions and identify perinatal clinical factors that influence early development of these subregions in very preterm infants. We performed a longitudinal cohort study of very preterm infants (32 weeks gestational age or younger) (N = 36) who underwent structural MRI and diffusion tensor imaging serially at four time points - before 32, 32, 38, and 52 weeks postmenstrual age. We divided the corpus callosum into six subregions, performed probabilistic tractography, and used linear mixed effects models to evaluate the influence of antecedent clinical factors on its microstructural growth trajectory...
May 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29764568/-effect-of-early-application-of-recombinant-human-erythropoietin-on-white-matter-development-in-preterm-infants
#18
Shu-Shuo Yang, Fa-Lin Xu, Hui-Qing Cheng, Hao-Ran Xu, Lin Yang, Jing-Yue Xing, Lin Cheng
OBJECTIVE: To evaluate the effect of early application of recombinant human erythropoietin (rhEPO) on white matter development in preterm infants using fractional anisotropy (FA) of magnetic resonance diffusion tensor imaging (DTI). METHODS: A total of 81 preterm infants with gestational age &le;32 weeks, birth weight <1 500 g, and hospitalization within 24 hours after birth were randomly divided into rhEPO group (42 infants) and control group (39 infants)...
May 2018: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/29764118/longitudinal-assessment-of-intravoxel-incoherent-motion-diffusion-weighted-imaging-in-evaluating-the-radio-sensitivity-of-nasopharyngeal-carcinoma-treated-with-intensity-modulated-radiation-therapy
#19
Youping Xiao, Ying Chen, Yunbin Chen, Zhuangzhen He, Yiqi Yao, Jianji Pan
Purpose: Intravoxel incoherent motion diffusion-weighted imaging (IVIM-DWI) was evaluated regarding its ability to preliminarily predict the short-term treatment response of nasopharyngeal carcinoma (NPC) following intensity-modulated radiation therapy. Methods: IVIM-DWI with 14 b-factors (0-1,000 s/mm2) was performed with a 3T MR system on 47 consecutive NPCs before, during (end of the 5th, 10th, 15th, 20th, and 25th fractions), and after fractional radiotherapy...
May 14, 2018: Cancer Research and Treatment: Official Journal of Korean Cancer Association
https://www.readbyqxmd.com/read/29764037/-the-value-of-high-resolution-diffusion-weighted-imaging-in-differentiating-benign-and-malignant-epithelial-tumors-of-parotid-gland
#20
B H Wen, J L Cheng, H X Zhang, Z X Zhang, F F Wang, K K Xue
Objective: To investigate the diagnostic value of RESOLVE DWI in the evaluation of benign and malignant epithelial tumors of parotid gland. Methods: A total of 106 patients in the First Affiliated Hospital of Zhengzhou University with epithelial tumors of parotid gland confirmed by pathology from July 2015 to October 2017 were retrospectively analyzed. All patients underwent preoperative routine MRI and RESOLVE DWI, the ADC average values were calculated, t test were used to compare the ADC values of benign and malignant epithelial tumors of parotid gland...
May 8, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
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