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3D surface imaging

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https://www.readbyqxmd.com/read/28634409/characterization-of-the-3d-structure-of-a-cultivated-land-surface-and-its-influence-on-wheat-seedlings-growth-using-kinect
#1
Tao Liu, Wen Chen, Fujian Li, Wei Wu, Chengming Sun, Jinfeng Ding, Xinkai Zhu, Wenshan Guo
The quality of wheat emergence has a significant impact on the subsequent growth and development of seedlings. The structure of cultivated land surfaces is an important factor influencing wheat seedlings growth. However, few studies have investigated this. In this study, three-dimensional structural parameters of cultivated land surfaces were collected using 3D imaging equipment, and the effects of different grades of lands on the emergence and growth of wheat were evaluated. The evaluation criteria for the soil blocks was designed according to the ISO-25178-2 standard, and the wheat emergence rate, speed, tillering capacity per plant, dry weight per plant, and final yields of different grades of cultivated land were investigated...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28626920/experimental-verification-of-egsnrc-monte-carlo-calculated-depth-doses-within-a-realistic-parallel-magnetic-field-in-a-polystyrene-phantom
#2
Andrei Ghila, Stephen Steciw, B Gino Fallone, Satyapal Rathee
PURPOSE: Integrating a linac with a magnetic resonance imager (MRI) will revolutionize the accuracy of external beam radiation treatments. Irradiating in the presence of a strong magnetic field, however, will modify the dose distribution. These dose modifications have been investigated previously, mainly using Monte Carlo simulations. The purpose of this work is to experimentally verify the use of the EGSnrc Monte Carlo (MC) package for calculating percent depth doses (PDDs) in a homogeneous phantom, in the presence of a realistic parallel magnetic field...
June 19, 2017: Medical Physics
https://www.readbyqxmd.com/read/28626291/machine-learning-in-a-graph-framework-for-subcortical-segmentation
#3
Zhihui Guo, Satyananda Kashyap, Milan Sonka, Ipek Oguz
Automated and reliable segmentation of subcortical structures from human brain magnetic resonance images is of great importance for volumetric and shape analyses in quantitative neuroimaging studies. However, poor boundary contrast and variable shape of these structures make the automated segmentation a tough task. We propose a 3D graph-based machine learning method, called LOGISMOS-RF, to segment the caudate and the putamen from brain MRI scans in a robust and accurate way. An atlas-based tissue classification and bias-field correction method is applied to the images to generate an initial segmentation for each structure...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28626288/assessment-of-radicular-dentin-permeability-after-irradiation-with-co2-laser-and-endodontic-irrigation-treatments-with-thermal-imaging
#4
Heajin Cho, Robert C Lee, Kenneth H Chan, Daniel Fried
Previous studies have demonstrated that the permeability changes due to the surface modification of dentin can be quantified via thermal imaging during dehydration. The CO2 laser has been shown to remove the smear layer and disinfect root canals. Moreover, thermal modification via CO2 laser irradiation can be used to convert dentin into a highly mineralized enamel-like mineral. The purpose of this study is to evaluate the radicular dentin surface modification after CO2 laser irradiation by measuring the permeability with thermal imaging...
January 28, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28623369/looking-beyond-the-imaging-plane-3d-needle-tracking-with-a-linear-array-ultrasound-probe
#5
Wenfeng Xia, Simeon J West, Malcolm C Finlay, Jean-Martial Mari, Sebastien Ourselin, Anna L David, Adrien E Desjardins
Ultrasound is well suited for guiding many minimally invasive procedures, but its use is often precluded by the poor visibility of medical devices. When devices are not visible, they can damage critical structures, with life-threatening complications. Here, we developed the first ultrasound probe that comprises both focused and unfocused transducer elements to provide both 2D B-mode ultrasound imaging and 3D ultrasonic needle tracking. A fibre-optic hydrophone was integrated into a needle to receive Golay-coded transmissions from the probe and these data were processed to obtain tracking images of the needle tip...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28623289/3d-super-resolution-optical-profiling-using-microsphere-enhanced-mirau-interferometry
#6
Ivan Kassamakov, Sylvain Lecler, Anton Nolvi, Audrey Leong-Hoï, Paul Montgomery, Edward Hæggström
We present quantitative three dimensional images of grooves on a writable Blu-ray Disc based on a single objective Mirau type interferometric microscope, enhanced with a microsphere which is considered as a photonic nanojet source. Along the optical axis the resolution of this microsphere assisted interferometry system is a few nanometers while the lateral resolution is around 112 nm. To understand the physical phenomena involved in this kind of imaging we have modelled the interaction between the photonic jet and the complex disc surface...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28620965/determination-of-retinal-surface-area
#7
Manbir Nagra, Bernard Gilmartin, Ngoc Jade Thai, Nicola S Logan
Previous attempts at determining retinal surface area and surface area of the whole eye have been based upon mathematical calculations derived from retinal photographs, schematic eyes and retinal biopsies of donor eyes. 3-dimensional (3-D) ocular magnetic resonance imaging (MRI) allows a more direct measurement, it can be used to image the eye in vivo, and there is no risk of tissue shrinkage. The primary purpose of this study is to compare, using T2-weighted 3D MRI, retinal surface areas for superior-temporal (ST), inferior-temporal (IT), superior-nasal (SN) and inferior-nasal (IN) retinal quadrants...
June 16, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28616993/multimodal-characterization-of-the-morphology-and-functional-interfaces-in-composite-electrodes-for-li-s-batteries-by-li-ion-and-electron-beams
#8
Vladimir P Oleshko, Andrew A Herzing, Kevin A Twedt, Jared J Griebel, Jabez J McClelland, Jeffrey Pyun, Christopher L Soles
We report the characterization of multiscale 3D structural architectures of novel poly[sulfur-random (1,3-diisopropenylbenzene)] copolymer-based cathodes for high-energy density Li-S batteries capable of realizing discharge capacities > 1000 mAh/g and long cycling life time > 500 cycles. Multiscale morphologies and interfacial structures have been investigated by a combination of focused Li-ion beam (LiFIB) and analytical electron microscopy in relation to the electrochemical performance and physico-mechanical stability of the cathodes...
June 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28615925/anterior-lamina-cribrosa-surface-depth-in-healthy-saudi-females
#9
Amira El-Agamy, Fayrouz Oteaf, Mohamed Berika
PURPOSE: This study was conducted to determine normative profile of anterior lamina cribrosa surface depth (ALCSD) in healthy Saudi females using Topcon Three-Dimensional (3D) Optical Coherence Tomography (OCT) 2000 - Spectral Domain (SD-OCT). In addition, the correlation between ALCSD and other clinical factors such as age, refractive error, intraocular pressure (IOP), central corneal thickness, anterior chamber depth, axial length, retinal nerve fiber layer thickness, and disk area was also assessed...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28615791/monte-carlo-investigation-of-backscatter-point-spread-function-for-x-ray-imaging-examinations
#10
Zhenyu Xiong, Sarath Vijayan, Stephen Rudin, Daniel R Bednarek
X-ray imaging examinations, especially complex interventions, may result in relatively high doses to the patient's skin inducing skin injuries. A method was developed to determine the skin-dose distribution for non-uniform x-ray beams by convolving the backscatter point-spread-function (PSF) with the primary-dose distribution to generate the backscatter distribution that, when added to the primary dose, gives the total-dose distribution. This technique was incorporated in the dose-tracking system (DTS), which provides a real-time color-coded 3D-mapping of skin dose during fluoroscopic procedures...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28614744/effects-of-aeration-on-matrix-temperature-by-infrared-thermal-imager-and-computational-fluid-dynamics-during-sludge-bio-drying
#11
Dawei Yu, Min Yang, Lu Qi, Mengmeng Liu, Yawei Wang, Yuansong Wei
The effect of aeration on the pile matrix temperature was investigated using thermocouples and Infrared Thermal Imager (IRI) for temperature sensing, and Computational Fluid Dynamics (CFD) for modelling of temperature variation during aeration in a full-scale sludge biodrying plant. With aeration saving of 20%, the improved strategy speeded up biodrying from 21 days to 14 days, while achieving similar drying effect. A persistent thermocouple recorded the one-dimensional (1D) total temperature variation of all aeration strategies...
June 4, 2017: Water Research
https://www.readbyqxmd.com/read/28613167/a-light-illumination-enhancement-device-for-photoacoustic-imaging-i-in-vivo-i-animal-study
#12
Jaesok Yu, Joel S Schuman, Jung-Kun Lee, Sang Goo Lee, Jin Ho Chang, Kang Kim
Photoacoustic (PA) imaging detects acoustic signals generated by thermal expansion of light excited tissue or contrast agents. PA signal amplitude and image quality directly depend on the light fluence at the target depth. With conventional PA imaging systems, approximately 30% energy of incident light at the near-infrared region would be lost due to reflection on the skin surface. Such light loss directly leads to a reduction of PA signal and image quality. A new light delivery scheme that collects and re-distributes reflected light energy was recently suggested, which is called the light catcher...
June 8, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28610688/efficacy-of-patient-specific-bolus-created-using-three-dimensional-printing-technique-in-photon-radiotherapy
#13
Koya Fujimoto, Takehiro Shiinoki, Yuki Yuasa, Hideki Hanazawa, Keiko Shibuya
PURPOSE: A commercially available bolus ("commercial-bolus") does not make complete contact with the irregularly shaped patient skin. This study aims to customise a patient-specific three-dimensional (3D) bolus using a 3D printing technique ("3D-bolus") and to evaluate its clinical feasibility for photon radiotherapy. METHODS: The 3D-bolus was designed using a treatment planning system (TPS) in Digital Imaging and Communications in Medicine-Radiotherapy (DICOM-RT) format, and converted to stereolithographic format for printing...
June 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28606410/effects-of-silane-and-mdp-based-primers-application-orders-on-zirconia-resin-adhesion-a-tof-sims-study
#14
Shu-Fen Chuang, Li-Li Kang, Yi-Chuan Liu, Jui-Che Lin, Ching-Cheng Wang, Hui-Min Chen, Cheng-Kun Tai
OBJECTIVE: To evaluate the 3-methacryloyloxypropyltrimethoxysilane (MPS)- and 10-methacryloyloxydecyl-dihydrogen-phosphate (MDP)-base primers, in their single or sequential applications, with regard to modifying zirconia surfaces and improving resin-zirconia adhesion. METHODS: Zirconia disks received different treatments: without primer (Zr), MPS-base primer (S), MDP-base primer (M), MPS/MDP mixture (SMmix), MPS followed by MDP (SM), and MDP followed by MPS (MS)...
June 9, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28597764/microct-analysis-of-vascular-morphometry-a-comparison-of-right-lung-lobes-in-the-sugen-hypoxic-rat-model-of-pulmonary-arterial-hypertension
#15
Erin M Faight, Kostas Verdelis, Lee Zourelias, Rong Chong, Raymond L Benza, Kelly J Shields
Pulmonary arterial hypertension (PAH) is a rare disease characterized by significant vascular remodeling within the lung. Clinical computed tomography (CT) scans are routinely used to aid in PAH diagnosis. Animal models, including the Sugen-hypoxic rat model (SU/hyp), of PAH closely mimic human PAH development. We have previously used micro-computed tomography (microCT) to find extensive right lung vascular remodeling in the SU/hyp. We hypothesized that the individual right lung lobes may not contribute equally to overall lung vascular remodeling...
April 2017: Pulmonary Circulation
https://www.readbyqxmd.com/read/28594852/three-dimensional-characterization-of-root-morphology-for-maxillary-incisors
#16
Carly A Ahlbrecht, Antonio Carlos de Oliveira Ruellas, Beatriz Paniagua, Juan A Schilling, James A McNamara, Lucia Helena Soares Cevidanes
The aim of this study was to test the reproducibility of three-dimensional (3D) surface models of maxillary incisors and to propose a characterization of root morphology. The sample was comprised of pre-treatment cone-beam computed tomography (CBCT) images of fifty-five patients. The CBCTs were used to construct 3D surface models of the maxillary incisors. The reproducibility of surface models was tested by repeated construction of them by two observers. A 3D surface model that corresponded to the average of all lateral and all central incisors was generated...
2017: PloS One
https://www.readbyqxmd.com/read/28593812/a-retrospective-study-comparing-the-loss-of-anchorage-following-the-extraction-of-maxillary-first-or-second-premolars-during-orthodontic-treatment-with-fixed-appliances-in-adolescent-patients
#17
S Haque, P J Sandler, M T Cobourne, P Bassett, A T DiBiase
INTRODUCTION: This retrospective study assessed the difference in anchorage loss using 3D superimposition of study models between cases treated with extraction of maxillary first premolars and maxillary second premolars carried out in orthodontic specialist practice. METHOD: Sixty subjects who have undergone extractions of either maxillary first or second premolars as part of their orthodontic treatment were selected. Eligibility criteria included patients with a Class I, mild Class II or III malocclusions, mild-to-moderate crowding with no anchorage reinforcement...
June 8, 2017: Journal of Orthodontics
https://www.readbyqxmd.com/read/28593506/conformal-mapping-of-carotid-vessel-wall-and-plaque-thickness-measured-from-3d-ultrasound-images
#18
Gary P T Choi, Yimin Chen, Lok Ming Lui, Bernard Chiu
Measurements of vessel-wall-plus-plaque thickness (VWT) from 3D carotid ultrasound have been shown to be sensitive to the effect of pharmaceutical interventions. Since the geometry of carotid arteries is highly subject-specific, quantitative comparison of the distributions of point-wise VWT measured for different patients or for the same patients at different ultrasound scanning sessions requires the development of a mapping strategy to adjust for the geometric variability of different carotid surface models...
June 7, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28593469/a-patient-specific-aortic-valve-model-based-on-moving-resistive-immersed-implicit-surfaces
#19
Marco Fedele, Elena Faggiano, Luca Dedè, Alfio Quarteroni
In this paper, we propose a full computational framework to simulate the hemodynamics in the aorta including the valve. Closed and open valve surfaces, as well as the lumen aorta, are reconstructed directly from medical images using new ad hoc algorithms, allowing a patient-specific simulation. The fluid dynamics problem that accounts from the movement of the valve is solved by a new 3D-0D fluid-structure interaction model in which the valve surface is implicitly represented through level set functions, yielding, in the Navier-Stokes equations, a resistive penalization term enforcing the blood to adhere to the valve leaflets...
June 7, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28592874/ct-based-local-distribution-metric-improves-characterization-of-copd
#20
Benjamin A Hoff, Esther Pompe, Stefanie Galbán, Dirkje S Postma, Jan-Willem J Lammers, Nick H T Ten Hacken, Leo Koenderman, Timothy D Johnson, Stijn E Verleden, Pim A de Jong, Firdaus A A Mohamed Hoesein, Maarten van den Berge, Brian D Ross, Craig J Galbán
Parametric response mapping (PRM) of paired CT lung images has been shown to improve the phenotyping of COPD by allowing for the visualization and quantification of non-emphysematous air trapping component, referred to as functional small airways disease (fSAD). Although promising, large variability in the standard method for analyzing PRM(fSAD) has been observed. We postulate that representing the 3D PRM(fSAD) data as a single scalar quantity (relative volume of PRM(fSAD)) oversimplifies the original 3D data, limiting its potential to detect the subtle progression of COPD as well as varying subtypes...
June 7, 2017: Scientific Reports
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