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https://www.readbyqxmd.com/read/29334259/development-of-three-dimensional-brain-arteriovenous-malformation-model-for-patient-communication-and-young-neurosurgeon-education
#1
Mengqi Dong, Guangzhong Chen, Kun Qin, Xiaowen Ding, Dong Zhou, Chao Peng, Shaojian Zeng, Xianming Deng
PURPOSE: Rapid prototyping technology is used to fabricate three-dimensional (3D) brain arteriovenous malformation (AVM) models and facilitate presurgical patient communication and medical education for young surgeons. METHODS: Two intracranial AVM cases were selected for this study. Using 3D CT angiography or 3D rotational angiography images, the brain AVM models were reconstructed on personal computer and the rapid prototyping process was completed using a 3D printer...
January 15, 2018: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/29334225/the-fate-of-poly-3-octylthiophene-transducer-in-solid-contact-ion-selective-electrodes
#2
Ewa Jaworska, Maciej Mazur, Krzysztof Maksymiuk, Agata Michalska
An experimental approach allowing visualization and quantification of underestimated spontaneous process of partition of conducting polymer transducer material to the ion-selective membrane phase is proposed. The approach proposed is based on optical properties of the transducer material applied, using polythiophene as a model system. It is shown that this process occurs not only during sensor preparation step but also during pretreatment of the sensor before use. As shown, this uncontrolled partition of the transducer to the receptor leads to conducting polymer contents in the membrane phase reaching 0...
January 15, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29334223/a-novel-color-modulation-analysis-strategy-through-tunable-multiband-laser-for-nanoparticle-identification-and-evaluation
#3
Xuan Cao, Gang Lei, Jingjing Feng, Qi Pan, Xiaodong Wen, Yan He
Creating color difference and improving the color resolution in digital imaging is crucial for better application of color analy-sis. Herein, a novel color modulation analysis strategy was developed by using a homemade tunable multiband laser illumi-nation device, in which the portions of R, G, and B components of the illumination light are discretionarily adjustable, and hence the sample color could be visually modulated continuously in the RGB color space. Through this strategy, the color appearance of single gold nanorods (AuNRs) under dark-field microscopy, was migrated from the spectrally insensitive red region to the spectrally sensitive green-yellow-red region...
January 15, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29334153/heterobimetallic-complexes-for-theranostic-applications
#4
M Concepción Gimeno, Vanesa Fernández-Moreira
The design of more efficient anticancer drugs requires a deeper understanding of their biodistribution and mechanism of action. Cell imaging agents could help to gain insight into biological processes and, consequently, the best strategy for attaining suitable scaffolds in which both, biological and imaging properties are maximized. A new concept arises in this field which is the combination of two metal fragments as collaborative partners to provide the precise emissive properties to visualize the cell as well as the optimum cytotoxic activity to build more potent and selective chemotherapeutic agents...
January 15, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29334131/a-bayesian-method-for-accelerated-magnetic-resonance-elastography-of-the-liver
#5
Christopher Ebersole, Rizwan Ahmad, Adam V Rich, Lee C Potter, Huiming Dong, Arunark Kolipaka
PURPOSE: Magnetic resonance elastography is a noninvasive tool for quantifying soft tissue stiffness. Magnetic resonance elastography has been adopted as a clinical method for staging liver fibrosis. However, the application of liver magnetic resonance elastography requires multiple lengthy breath-holds. We propose a new data acquisition and processing method to reduce magnetic resonance elastography scan time. METHODS: A Bayesian image reconstruction method that uses transform sparsity and magnitude consistency across different phase offsets to recover images from highly undersampled data is proposed...
January 15, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29333754/a-guide-to-analysis-and-reconstruction-of-serial-block-face-scanning-electron-microscopy-data
#6
E Cocks, M Taggart, F C Rind, K White
Serial block face scanning electron microscopy (SBF-SEM) is a relatively new technique that allows the acquisition of serially sectioned, imaged and digitally aligned ultrastructural data. There is a wealth of information that can be obtained from the resulting image stacks but this presents a new challenge for researchers - how to computationally analyse and make best use of the large datasets produced. One approach is to reconstruct structures and features of interest in 3D. However, the software programmes can appear overwhelming, time-consuming and not intuitive for those new to image analysis...
January 15, 2018: Journal of Microscopy
https://www.readbyqxmd.com/read/29333688/infant-brain-responses-to-felt-and-observed-touch-of-hands-and-feet-an-meg-study
#7
Andrew N Meltzoff, Rey R Ramírez, Joni N Saby, Eric Larson, Samu Taulu, Peter J Marshall
There is growing interest concerning the ways in which the human body, both one's own and that of others, is represented in the developing human brain. In two experiments with 7-month-old infants, we employed advances in infant magnetoencephalography (MEG) brain imaging to address novel questions concerning body representations in early development. Experiment 1 evaluated the spatiotemporal organization of infants' brain responses to being touched. A punctate touch to infants' hands and feet produced significant activation in the hand and foot areas of contralateral primary somatosensory cortex as well as in other parietal and frontal areas...
January 14, 2018: Developmental Science
https://www.readbyqxmd.com/read/29333674/microrna-detection-by-dna-mediated-liposome-fusion
#8
Coline Jumeaux, Olov Wahlsten, Stephan Block, Eunjung Kim, Rona Chandrawati, Philip D Howes, Fredrik Höök, Molly M Stevens
Membrane fusion is a process of fundamental importance in biological systems that involves highly selective recognition mechanisms for the trafficking of molecular and ionic cargos. Mimicking natural membrane fusion mechanisms for the purpose of biosensor development holds great potential for amplified detection because relatively few highly discriminating targets lead to fusion and an accompanied engagement of a large payload of signal-generating molecules. In this work, sequence-specific DNA-mediated liposome fusion is used for the highly selective detection of microRNA...
December 7, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/29333590/advantages-and-disadvantages-in-image-processing-with-free-software-in-radiology
#9
Katrin Muradas Mujika, Juan Antonio Juanes Méndez, Andrés Framiñan de Miguel
Currently, there are sophisticated applications that make it possible to visualize medical images and even to manipulate them. These software applications are of great interest, both from a teaching and a radiological perspective. In addition, some of these applications are known as Free Open Source Software because they are free and the source code is freely available, and therefore it can be easily obtained even on personal computers. Two examples of free open source software are Osirix Lite® and 3D Slicer®...
January 15, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29333480/gpu-based-branchless-distance-driven-projection-and-backprojection
#10
Rui Liu, Lin Fu, Bruno De Man, Hengyong Yu
Projection and backprojection operations are essential in a variety of image reconstruction and physical correction algorithms in CT. The distance-driven (DD) projection and backprojection are widely used for their highly sequential memory access pattern and low arithmetic cost. However, a typical DD implementation has an inner loop that adjusts the calculation depending on the relative position between voxel and detector cell boundaries. The irregularity of the branch behavior makes it inefficient to be implemented on massively parallel computing devices such as graphics processing units (GPUs)...
December 2017: IEEE Transactions on Computational Imaging
https://www.readbyqxmd.com/read/29333113/grating-oriented-line-wise-filtration-golf-for-dual-energy-x-ray-ct
#11
Yan Xi, Wenxiang Cong, Daniel Harrison, Ge Wang
In medical X-ray Computed Tomography (CT), the use of two distinct X-ray source spectra (energies) allows dose-reduction and material discrimination relative to that achieved with only one source spectrum. Existing dual-energy CT methods include source kVp-switching, double-layer detection, dual-source gantry, and two-pass scanning. Each method suffers either from strong spectral correlation or patient-motion artifacts. To simultaneously address these problems, we propose to improve CT data acquisition with the Grating Oriented Line-wise Filtration (GOLF) method, a novel X-ray filter that is placed between the source and patient...
December 2017: Sensing and Imaging
https://www.readbyqxmd.com/read/29332951/soil-seal-development-under-simulated-rainfall-structural-physical-and-hydrological-dynamics
#12
Elena Armenise, Robert W Simmons, Sujung Ahn, Amin Garbout, Stefan H Doerr, Sacha J Mooney, Craig J Sturrock, Karl Ritz
This study delivers new insights into rainfall-induced seal formation through a novel approach in the use of X-ray Computed Tomography (CT). Up to now seal and crust thickness have been directly quantified mainly through visual examination of sealed/crusted surfaces, and there has been no quantitative method to estimate this important property. X-ray CT images were quantitatively analysed to derive formal measures of seal and crust thickness. A factorial experiment was established in the laboratory using open-topped microcosms packed with soil...
January 2018: Journal of Hydrology
https://www.readbyqxmd.com/read/29332926/differentiating-between-alzheimer-disease-patients-and-controls-with-phase-difference-enhanced-imaging-at-3t-a-feasibility-study
#13
Machiko Tateishi, Mika Kitajima, Toshinori Hirai, Tetsuya Yoneda, Mamoru Hashimoto, Nan Kurehana, Hiroyuki Uetani, Ryuji Fukuhara, Minako Azuma, Yasuyuki Yamashita
PURPOSE: To test the feasibility of the phase difference enhanced (PADRE) imaging for differentiation between Alzheimer disease (AD) patients and control subjects on 3T MR imaging. MATERIALS AND METHODS: Fifteen patients with AD and 10 age-matched control subjects underwent two-dimensional fast field echo imaging to obtain PADRE images on a 3T MR scanner. A double Gaussian distribution model was used to determine the threshold phase value for differentiation between the physiologic and non-physiologic iron in the cerebral cortices, and PADRE images were processed with the threshold...
January 15, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29332822/constituting-fully-integrated-colorimetric-analysis-system-for-fe-iii-on-multifunctional-nitrogen-doped-moo3-cellulose-paper
#14
Fan Lin, Jiabai Cai, Yuehai Li, Huiwu Yu, Shunxing Li
Using ammonium molybdate and thiourea as precursors, nitrogen-doped MoO3 was produced by a one-step carbonization and then fixed into the cellulose filter paper (NMCP) with acrylic resin as a fixative. NMCP was designed as a multifunctional nanocomposite, i.e., solid phase adsorbent for Fe(III) preconcentration, photocatalyst for iron species transformation and color interference removal, and colorimetric sensor for Fe(III) determination. After photocatalysis, the complex of Fe-humic substances could be transformed into Fe(III) ions, the interference of colored organic matter (e...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29332289/detection-of-reactive-oxygen-and-nitrogen-species-ros-rns-during-hypersensitive-cell-death
#15
Laura C Terrón-Camero, Eliana Molina-Moya, María Sanz-Fernández, Luisa M Sandalio, María C Romero-Puertas
Reactive oxygen and nitrogen species (ROS/RNS) are signaling molecules involved in a plethora of physiological processes in plants. Especially, ROS and nitric oxide (NO) are key players that are required for programmed cell death (PCD). The PCD associated with the hypersensitive response (HR) has been well characterized and the role of H2O2 and NO as key signaling molecules inducing HR has been established. Localization of ROS and NO production in plant tissues in response to pathogens can be imaged by confocal laser microscopy by using specific fluorescent probes...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29332131/assessment-of-human-corneas-prior-to-transplantation-using-high-resolution-two-photon-imaging
#16
Ana Batista, Hans Georg Breunig, Aisada König, Andreas Schindele, Tobias Hager, Berthold Seitz, António Miguel Morgado, Karsten König
Purpose: The purpose of this study was to evaluate the feasibility of using two-photon imaging (TPI) to assess the condition of human corneas for transplantation. Methods: Human corneas were imaged after different storage times: short-term (STS), medium-term (MTS), and long-term (LTS) storage. A high-resolution, custom-built 5-dimensional multiphoton microscope with 12-fs pulsed laser excitation was used for image acquisition. Results: Optical discrimination between different corneal layers and sublayers based on their morphologic characteristics revealed by two-photon autofluorescence (AF) is possible...
January 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29332052/when-art-meets-gardens-does-it-enhance-the-benefits-the-nancy-hypothesis-of-care-for-persons-with-alzheimer-s-disease
#17
Thérèse Rivasseau Jonveaux, Reinhard Fescharek
The creation of healing gardens for persons with Alzheimer's disease and related diseases (ADRD) offers vast potential. They can play a role in the scaffolding of cognitive disorders, emotional stress, sensory processing, sense of harmony, and appeasement. These effects are achieved through a distributed interplay of psychological functions with the immediate environment and local culture on the one hand, and dialogue on the other. The garden, a natural canvas created by man, shares with art the ability to foster an esthetic sense for which the perception can be measured by functional neurological imaging exploration...
2018: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29331739/determination-of-atomic-scale-chemical-composition-at-semiconductor-heteroepitaxial-interfaces-by-high-resolution-transmission-electron-microscopy
#18
C Wen, Y J Ma
The determination of atomic structures and further quantitative information such as chemical compositions at atomic scale for semiconductor defects or heteroepitaxial interfaces can provide direct evidence to understand their formation, modification, and/or effects on the properties of semiconductor films. The commonly used method, high-resolution transmission electron microscopy (HRTEM), suffers from difficulty in acquiring images that correctly show the crystal structure at atomic resolution, because of the limitation in microscope resolution or deviation from the Scherzer-defocus conditions...
January 8, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29331680/estimating-error-rates-for-firearm-evidence-identifications-in-forensic-science
#19
John Song, Theodore V Vorburger, Wei Chu, James Yen, Johannes A Soons, Daniel B Ott, Nien Fan Zhang
Estimating error rates for firearm evidence identification is a fundamental challenge in forensic science. This paper describes the recently developed congruent matching cells (CMC) method for image comparisons, its application to firearm evidence identification, and its usage and initial tests for error rate estimation. The CMC method divides compared topography images into correlation cells. Four identification parameters are defined for quantifying both the topography similarity of the correlated cell pairs and the pattern congruency of the registered cell locations...
December 13, 2017: Forensic Science International
https://www.readbyqxmd.com/read/29331627/use-of-interactive-data-visualization-in-multi-objective-forest-planning
#20
Arto Haara, Jouni Pykäläinen, Anne Tolvanen, Mikko Kurttila
Common to multi-objective forest planning situations is that they all require comparisons, searches and evaluation among decision alternatives. Through these actions, the decision maker can learn from the information presented and thus make well-justified decisions. Interactive data visualization is an evolving approach that supports learning and decision making in multidimensional decision problems and planning processes. Data visualization contributes the formation of mental image data and this process is further boosted by allowing interaction with the data...
January 10, 2018: Journal of Environmental Management
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