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https://www.readbyqxmd.com/read/29346868/effective-one-dimensional-approach-to-the-source-reconstruction-problem-of-three-dimensional-inverse-optoacoustics
#1
J Stritzel, O Melchert, M Wollweber, B Roth
The direct problem of optoacoustic signal generation in biological media consists of solving an inhomogeneous three-dimensional (3D) wave equation for an initial acoustic stress profile. In contrast, the more defiant inverse problem requires the reconstruction of the initial stress profile from a proper set of observed signals. In this article, we consider an effectively 1D approach, based on the assumption of a Gaussian transverse irradiation source profile and plane acoustic waves, in which the effects of acoustic diffraction are described in terms of a linear integral equation...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346091/plenoptic-image-motion-deblurring
#2
Paramanand Chandramouli, Meiguang Jin, Daniele Perrone, Paolo Favaro
We propose a method to remove motion blur in a single light field captured with a moving plenoptic camera. Since motion is unknown, we resort to a blind deconvolution formulation, where one aims to identify both the blur point spread function and the latent sharp image. Even in the absence of motion, light field images captured by a plenoptic camera are affected by a non-trivial combination of both aliasing and defocus, which depends on the 3D geometry of the scene. Therefore, motion deblurring algorithms designed for standard cameras are not directly applicable...
April 2018: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/29332791/highly-sensitive-and-reproducible-non-enzymatic-glucose-sensor-fabricated-by-drop-casting-novel-nanocomposite-with-3d-architecture-and-tailorable-properties-prepared-in-controllable-way
#3
Min Ma, Taotao Zhe, Yiyue Ma, Zonghan Wang, Qiang Chen, Jianlong Wang
Novel nanocomposite has tailorable properties and ordered 3D architecture similar to the structure of materials prepared by electrodeposition which is convenient and efficient but the reproducibility is limited because of the uncontrollable preparation process, was scientifically synthetized in controllable way and used for non-enzymatic glucose sensor for the first time. Flower-like α-Ni(OH)2 with high specific surface areas and good anion transport ability benefited from its distinctive stacking faults and turbostratic disorder structure was synthesized through facile one-step hydrothermal method...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29289317/fabricating-smooth-pdms-microfluidic-channels-from-low-resolution-3d-printed-molds-using-an-omniphobic-lubricant-infused-coating
#4
Martin Villegas, Zachary Cetinic, Amid Shakeri, Tohid F Didar
The advent of 3D printing has allowed for rapid bench-top fabrication of molds for casting polydimethylsiloxane (PDMS) chips, a widely-used polymer in prototyping microfluidic devices. While fabricating PDMS devices from 3D printed molds is fast and cost-effective, creating smooth surface topology is highly dependent on the printer's quality. To produce smooth PDMS channels from these molds, we propose a novel technique in which a lubricant is tethered to the surface of a 3D printed mold, which results in a smooth interface for casting PDMS...
February 13, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29275932/an-in-vitro-study-to-assess-the-feasibility-validity-and-precision-of-capturing-oncology-facial-defects-with-multimodal-image-fusion
#5
Rachael Y Jablonski, Cecilie A Osnes, Balvinder S Khambay, Brian R Nattress, Andrew J Keeling
AIM: Assess the feasibility, validity and precision of multimodal image fusion to capture oncology facial defects based on plaster casts. METHODS: Ten casts of oncology facial defects were acquired. To create gold standard models, a 3D volumetric scan of each cast was obtained with a cone beam computed tomography (CBCT) scanner (NewTomVG). This was converted into surface data using open-source medical segmentation software and cropped to produce a CBCT mask using an open-source system for editing meshes...
December 21, 2017: Surgeon: Journal of the Royal Colleges of Surgeons of Edinburgh and Ireland
https://www.readbyqxmd.com/read/29235202/three-dimensional-static-articulation-accuracy-of-virtual-models-part-i-system-trueness-and-precision
#6
Sophia Hui Xin Yee, Roxanna Jean Esguerra, Amelia Anya Qin'An Chew, Keng Mun Wong, Keson Beng Choon Tan
PURPOSE: To evaluate the 3D static articulation accuracy of 3 model scanner-CAD systems (Ceramill Map400 [AG], inEos X5 [SIR], Scanner S600 Arti [ZKN]) using a coordinate measuring machine (CMM). Trueness and precision for each system will be reported in Part I. MATERIALS AND METHODS: The master model simulated a single crown opposing a 3-unit fixed dental prosthesis. Five mounted stone cast sets were prepared, and one set was randomly selected. Reference values were obtained by measuring interarch and interocclusal reference features with the CMM...
December 13, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29219124/3d-printed-adaptive-acoustic-lens-as-a-disruptive-technology-for-transcranial-ultrasound-therapy-using-single-element-transducers
#7
Guillaume Maimbourg, Alexandre Houdouin, Thomas Deffieux, Mickael Tanter, Jean-Francois Aubry
The development of multi-element arrays for better control of the shape of ultrasonic beams has opened the way for focusing through highly aberrating media, such as the human skull. As a result, the use of brain therapy with transcranial-focused ultrasound has rapidly grown. Although effective, such technology is expensive. We propose a disruptive, low-cost approach that consists of focusing a 1-MHz ultrasound beam through a human skull with a single-element transducer coupled with a tailored silicone acoustic lens cast in a 3D-printed mold and designed using computed tomography-based numerical acoustic simulation...
December 8, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29210564/in-situ-characterization-of-photothermal-nanoenergetic-combustion-on-a-plasmonic-microchip
#8
Biyan Chen, Haisheng Zheng, Matthew Riehn, Sangho Bok, Keshab Gangopadhyay, Matthew R Maschmann, Shubhra Gangopadhyay
Plasmonic gratings facilitate a robust in-situ diagnostic platform for photothermal combustion of nanoenergetic composite thin films using an optical microscope and high-speed camera. Aluminum nanoparticles (Al NPs) embedded in THV fluoropolymer oxidizer are cast onto a plasmonic grating microchip and ignited using a low-power laser. The plasmonic grating enhances both spatial resolution and sufficient photothermal coupling to combust small Al NP clusters, initiating localized flames as small as 600 nm in size...
December 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29210502/three-dimensional-static-articulation-accuracy-of-virtual-models-part-ii-effect-of-model-scanner-cad-systems-and-articulation-method
#9
Sophia Hui Xin Yee, Roxanna Jean Esguerra, Amelia Anya Qin'An Chew, Keng Mun Wong, Keson Beng Choon Tan
PURPOSE: Accurate maxillomandibular relationship transfer is important for CAD/CAM prostheses. This study compared the 3D-accuracy of virtual model static articulation in three laboratory scanner-CAD systems (Ceramill Map400 [AG], inEos X5 [SIR], Scanner S600 Arti [ZKN]) using two virtual articulation methods: mounted models (MO), interocclusal record (IR). MATERIALS AND METHODS: The master model simulated a single crown opposing a 3-unit fixed partial denture. Reference values were obtained by measuring interarch and interocclusal reference features with a coordinate measuring machine (CMM)...
December 6, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29205328/quantitative-analysis-of-hepatic-macro-and-microvascular-alterations-during-cirrhogenesis-in-the%C3%A2-rat
#10
Geert Peeters, Charlotte Debbaut, Adrian Friebel, Pieter Cornillie, Winnok H De Vos, Kasper Favere, Ingrid Vander Elst, Tim Vandecasteele, Tim Johann, Luc Van Hoorebeke, Diethard Monbaliu, Dirk Drasdo, Stefan Hoehme, Wim Laleman, Patrick Segers
Cirrhosis represents the end-stage of any persistent chronically active liver disease. It is characterized by the complete replacement of normal liver tissue by fibrosis, regenerative nodules, and complete fibrotic vascularized septa. The resulting angioarchitectural distortion contributes to an increasing intrahepatic vascular resistance, impeding liver perfusion and leading to portal hypertension. To date, knowledge on the dynamically evolving pathological changes of the hepatic vasculature during cirrhogenesis remains limited...
December 4, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/29204227/workflow-of-cad-cam-scoliosis-brace-adjustment-in-preparation-using-3d-printing
#11
Hans-Rudolf Weiss, Nicos Tournavitis, Xiaofeng Nan, Maksym Borysov, Lothar Paul
Background: High correction bracing is the most effective conservative treatment for patients with scoliosis during growth. Still today braces for the treatment of scoliosis are made by casting patients while computer aided design (CAD) and computer aided manufacturing (CAM) is available with all possibilities to standardize pattern specific brace treatment and improve wearing comfort. Objective: CAD / CAM brace production mainly relies on carving a polyurethane foam model which is the basis for vacuuming a polyethylene (PE) or polypropylene (PP) brace...
2017: Open Medical Informatics Journal
https://www.readbyqxmd.com/read/29192356/measuring-3d-shape-in-orthodontics-through-geometric-morphometrics
#12
Luis Huanca Ghislanzoni, Roberta Lione, Paola Cozza, Lorenzo Franchi
BACKGROUND: Geometric morphometrics (GMM) has been traditionally applied to the field of biology to study developmental differentiations between species. Orthodontics deals with the shape and size of the face and its components. While several tools have been used to measure size, proportions, and relations between anatomical components, shape has been mainly described by esthetic criteria. The purpose of this paper is to present methods to measure shape of 3D orthodontic data, beyond the conventional tools that have been traditionally used in cephalometrics and in facial and dental cast analysis...
December 1, 2017: Progress in Orthodontics
https://www.readbyqxmd.com/read/29176756/cryogenic-3d-printing-of-super-soft-hydrogels
#13
Zhengchu Tan, Cristian Parisi, Lucy Di Silvio, Daniele Dini, Antonio Elia Forte
Conventional 3D bioprinting allows fabrication of 3D scaffolds for biomedical applications. In this contribution we present a cryogenic 3D printing method able to produce stable 3D structures by utilising the liquid to solid phase change of a composite hydrogel (CH) ink. This is achieved by rapidly cooling the ink solution below its freezing point using solid carbon dioxide (CO2) in an isopropanol bath. The setup was able to successfully create 3D complex geometrical structures, with an average compressive stiffness of O(1) kPa (0...
November 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29167720/peek-polymer-in-orthodontics-a-pilot-study-on-children
#14
Gaetano Ierardo, Valeria Luzzi, Michela Lesti, Iole Vozza, Orlando Brugnoletti, Antonella Polimeni, Maurizio Bossù
The purpose of the study has been making the orthodontic space maintainers in PEEK polymer (Polyetheretherketone) through a digital workflow. New digital technologies are taking hold in diagnosis, therapy and in dental laboratories. The digital world can help dentist in diagnosis and therapy: -diagnosis through the acquisition of radiographic images (CBCT) or scanners which allow the creation of 3D digital models - about therapy thanks to dental CAD CAM system. It consists of design devices through an dedicated software CAD and then realize devices through CAM system...
October 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29160086/anatomic-and-radiologic-study-of-renal-avascular-plane-brodel-s-line-and-its-potential-relevance-on-percutaneous-and-surgical-approaches-to-the-kidney
#15
Veronica Macchi, Edgardo Picardi, Antonino Inferrera, Andrea Porzionato, Alessandro Crestani, Giacomo Novara, Raffaele De Caro, Vincenzo Ficarra
OBJECTIVE: The aim of the present anatomic and radiologic study was to evaluate the location, extension and characteristics of the Brödel's plane and eventually define its different patterns. MATERIAL AND METHODS: We evaluated 15 human normal kidneys sampled from un-embalmed cadavers without clinical history or anatomical evidence of renal diseases. Kidneys with the surrounding perirenal fat tissue were removed en bloc with the abdominal segment of the aorta. The renal artery was injected with acrylic and radiopaque resins...
November 21, 2017: Journal of Endourology
https://www.readbyqxmd.com/read/29159511/application-of-3d-models-of-palatal-rugae-to-personal-identification-hints-at-identification-from-3d-3d-superimposition-techniques
#16
Daniele Gibelli, Danilo De Angelis, Valentina Pucciarelli, Francesco Riboli, Virgilio F Ferrario, Claudia Dolci, Chiarella Sforza, Cristina Cattaneo
Palatal rugae are known in literature as individualizing anatomical structures with a strong potential for personal identification. However, a 3D assessment of their uniqueness has not yet been performed. The present study aims at verifying the uniqueness of 3D models of the palate. Twenty-six subjects were recruited among the orthodontic patients of a private dental office; from every patient, at least two dental casts were taken in different time periods, for a total of 62 casts. Dental casts were digitized by a 3D laser scanner (iSeries, Dental Wings©, Montreal, Canada)...
November 20, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/29157956/comparative-analysis-of-fixation-and-embedding-techniques-for-optimized-histological-preparation-of-zebrafish
#17
Jean E Copper, Lynn R Budgeon, Christina A Foutz, Damian B van Rossum, Daniel J Vanselow, Margaret J Hubley, Darin P Clark, David T Mandrell, Keith C Cheng
In recognition of the importance of zebrafish as a model organism for studying human disease, we have created a web-based reference atlas of zebrafish microanatomy for comparing histology and histopathology between model systems and with humans (http://bio-atlas.psu.edu). Fixation, decalcification, embedding, and sectioning were optimized to maximize section quality. A comparison of protocols involving six fixatives showed that 10% Neutral Buffered Formalin at 21°C for 24h yielded excellent results. Sectioning of juveniles and adults requires bone decalcification; EDTA at 0...
November 17, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/29152451/comparison-of-different-soft-grippers-for-lunch-box-packaging
#18
Zhongkui Wang, Mingzhu Zhu, Sadao Kawamura, Shinichi Hirai
Automating the lunch box packaging is a challenging task due to the high deformability and large individual differences in shape and physical property of food materials. Soft robotic grippers showed potentials to perform such tasks. In this paper, we presented four pneumatic soft actuators made of different materials and different fabrication methods and compared their performances through a series of tests. We found that the actuators fabricated by 3D printing showed better linearity and less individual differences, but showed low durability compared to actuators fabricated by traditional casting process...
2017: Robotics and Biomimetics
https://www.readbyqxmd.com/read/29148121/position-accuracy-of-implant-analogs-on-3d-printed-polymer-versus-conventional-dental-stone-casts-measured-using-a-coordinate-measuring-machine
#19
Marta Revilla-León, Óscar Gonzalez-Martín, Javier Pérez López, José Luis Sánchez-Rubio, Mutlu Özcan
PURPOSE: To compare the accuracy of implant analog positions on complete edentulous maxillary casts made of either dental stone or additive manufactured polymers using a coordinate measuring machine (CMM). MATERIAL AND METHODS: A completely edentulous maxillary model of a patient with 7 implant analogs was obtained. From this model, two types of casts were duplicated, namely conventional dental stone (CDS) using a custom tray impression technique after splinting (N = 5) and polymer cast using additive manufacturing based on the STL file generated...
November 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29144426/experimental-exploration-of-metal-cable-as-reinforcement-in-3d-printed-concrete
#20
Freek P Bos, Zeeshan Y Ahmed, Evgeniy R Jutinov, Theo A M Salet
The Material Deposition Method (MDM) is enjoying increasing attention as an additive method to create concrete mortar structures characterised by a high degree of form-freedom, a lack of geometrical repetition, and automated construction. Several small-scale structures have been realised around the world, or are under preparation. However, the nature of this construction method is unsuitable for conventional reinforcement methods to achieve ductile failure behaviour. Sometimes, this is solved by combining printing with conventional casting and reinforcing techniques...
November 16, 2017: Materials
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