keyword
MENU ▼
Read by QxMD icon Read
search

3D reconstruction

keyword
https://www.readbyqxmd.com/read/29782796/resolution-measurement-from-a-single-reconstructed-cryo-em-density-map-with-multi-scale-spectral-analysis
#1
Yu-Jiao Yang, Shuai Wang, Biao Zhang, Hong-Bin Shen
As a relatively new technology to solve the 3D structure of a protein or protein complex, the Single-Particle Reconstruction (SPR) of cryo-EM images shows much superiority and is in a rapidly developing stage. Resolution measurement in SPR, which evaluates the quality of a reconstructed 3D density map, plays a critical role for promoting methodology development of SPR and structural biology. Due to there is no benchmark map in a new structure generation, how to realize the resolution estimation of a new map is still an open problem...
May 21, 2018: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/29782617/patient-specific-neurosurgical-phantom-assessment-of-visual-quality-accuracy-and-scaling-effects
#2
Felipe Wilker Grillo, Victor Hugo Souza, Renan Hiroshi Matsuda, Carlo Rondinoni, Theo Zeferino Pavan, Oswaldo Baffa, Helio Rubens Machado, Antonio Adilton Oliveira Carneiro
Background: Training in medical education depends on the availability of standardized materials that can reliably mimic the human anatomy and physiology. One alternative to using cadavers or animal bodies is to employ phantoms or mimicking devices. Styrene-ethylene/butylene-styrene (SEBS) gels are biologically inert and present tunable properties, including mechanical properties that resemble the soft tissue. Therefore, SEBS is an alternative to develop a patient-specific phantom, that provides real visual and morphological experience during simulation-based neurosurgical training...
2018: 3D Print Med
https://www.readbyqxmd.com/read/29782609/low-cost-customized-cranioplasty-using-a-3d-digital-printing-model-a-case-report
#3
Abel De La Peña, Javier De La Peña-Brambila, Juan Pérez-De La Torre, Miguel Ochoa, Guillermo J Gallardo
Background: Cranial defects usually occur after trauma, neurosurgical procedures like decompressive craniotomy, tumour resections, infection and congenital defects. The purpose of cranial vault repair is to protect the underlying brain tissue, to reduce any localized pain and patient anxiety, and improve cranial aesthetics. Cranioplasty is a frequent neurosurgical procedure achieved with the aid of cranial prosthesis made from materials such as: titanium, autologous bone, ceramics and polymers...
2018: 3D printing in medicine
https://www.readbyqxmd.com/read/29781248/the-role-of-3d-printing-in-treating-craniomaxillofacial-congenital-anomalies
#4
REVIEW
Christopher D Lopez, Lukasz Witek, Andrea Torroni, Roberto L Flores, David B Demissie, Simon Young, Bruce N Cronstein, Paulo G Coelho
Craniomaxillofacial congenital anomalies comprise approximately one third of all congenital birth defects and include deformities such as alveolar clefts, craniosynostosis, and microtia. Current surgical treatments commonly require the use of autogenous graft material which are difficult to shape, limited in supply, associated with donor site morbidity and cannot grow with a maturing skeleton. Our group has demonstrated that 3D printed bio-ceramic scaffolds can generate vascularized bone within large, critical-sized defects (defects too large to heal spontaneously) of the craniomaxillofacial skeleton...
May 20, 2018: Birth Defects Research
https://www.readbyqxmd.com/read/29778016/multiscale-reconstruction-of-a-synthetic-biomimetic-micro-niche-for-enhancing-and-monitoring-the-differentiation-of-stem-cells
#5
Rui Li, Jinming Li, Jianbin Xu, Dexter Siu Hong Wong, Xiaoyu Chen, Weihao Yuan, Liming Bian
Stem cells reside in a three-dimensional (3D) niche microenvironment, which provides specific cues, including cell-matrix interactions and soluble factors, that are essential to the differentiation of stem cells in vivo. Herein we demonstrate a general approach to the synthetic reconstruction of 3D biomimetic niche environment of stem cells by the multiscale combination of macroscopic porous hydrogels and a nanoscale upconversion nanoparticles (UCNP)-based nanocomplex. The porous biopolymeric hydrogels emulate the spongy bone microstructure and provide 3D environment conducive to the differentiation of seeded stem cells...
May 4, 2018: Biomaterials
https://www.readbyqxmd.com/read/29777859/three-dimensional-model-of-the-female-perineum-and-pelvic-floor-muscles
#6
Géraldine Giraudet, Laurent Patrouix, Christian Fontaine, Xavier Demondion, Michel Cosson, Chrystèle Rubod
OBJECTIVE: The anatomy of the perineum and the pelvic diaphragm of woman is complex. A numerical complete three-dimensional (3D) model of every muscle of the woman pelvis doesn't exist. The pathophysiology of genital prolapse is still debated. Knowledge of anatomy is essential to better understand its mechanisms. The aim of this research was to build a complete three-dimensional model of the female perineum and pelvic floor muscles. STUDY DESIGN: To model the pelvic muscles we reconstructed them in three dimensions from tracing a magnetic resonance imaging (MRI) of a female pelvis from a cadaver...
May 16, 2018: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/29776156/realizations-of-highly-heterogeneous-collagen-networks-via-stochastic-reconstruction-for-micromechanical-analysis-of-tumor-cell-invasion
#7
Hanqing Nan, Long Liang, Guo Chen, Liyu Liu, Ruchuan Liu, Yang Jiao
Three-dimensional (3D) collective cell migration in a collagen-based extracellular matrix (ECM) is among one of the most significant topics in developmental biology, cancer progression, tissue regeneration, and immune response. Recent studies have suggested that collagen-fiber mediated force transmission in cellularized ECM plays an important role in stress homeostasis and regulation of collective cellular behaviors. Motivated by the recent in vitro observation that oriented collagen can significantly enhance the penetration of migrating breast cancer cells into dense Matrigel which mimics the intravasation process in vivo [Han et al...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29775913/mobile-phone-based-evaluation-of-latent-tuberculosis-infection-proof-of-concept-for-an-integrated-image-capture-and-analysis-system
#8
Safa Naraghi, Tinashe Mutsvangwa, René Goliath, Molebogeng X Rangaka, Tania S Douglas
BACKGROUND: The tuberculin skin test is the most widely used method for detecting latent tuberculosis infection in adults and active tuberculosis in children. We present the development of a mobile-phone based screening tool for measuring the tuberculin skin test induration. METHOD: The tool makes use of a mobile application developed on the Android platform to capture images of an induration, and photogrammetric reconstruction using Agisoft PhotoScan to reconstruct the induration in 3D, followed by 3D measurement of the induration with the aid of functions from the Python programming language...
May 8, 2018: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29775115/immunofluorescent-localization-of-non-myelinating-schwann-cells-and-their-interactions-with-immune-cells-in-mouse-thymus
#9
Dailun Hu, Philip K Nicholls, Changfu Yin, Khama Kelman, Qionglan Yuan, Wayne K Greene, Zhongli Shi, Bin Ma
The thymus is innervated by sympathetic/parasympathetic nerve fibers from the peripheral nervous system (PNS), suggesting a neural regulation of thymic function including T-cell development. Despite some published studies, data on the innervation and nerve-immune interaction inside the thymus remain limited. In the present study, we used immunofluorescent staining of glial fibrillary acidic protein (GFAP) coupled with confocal microscopy/three-dimensional (3D) reconstruction to reveal the distribution of non-myelinating Schwann cells (NMSC) and their interactions with immune cells inside mouse thymus...
May 1, 2018: Journal of Histochemistry and Cytochemistry: Official Journal of the Histochemistry Society
https://www.readbyqxmd.com/read/29775014/-the-application-of-3d-reconstruction-in-investigating-the-frontal-sinus-drainage-pathway-based-on-computer-tomography-data
#10
Y Liu, X Q Ma, X H Sun, S Dai, J F Zhang, H B Li, X Ma, J Y Wang, Q Dou, J Y Tian, J P Jia
Objective: The aim of this study is to explore the value of 3D reconstruction technology based on computer tomography data in understanding the frontal sinus drainage pathway. Method: Three-dimensional reconstruction of DICOM data from 100 cases of sinus CT was performed by using Mimics 19.0 software. The 3D models were used to study types, the relative locations of frontal sinus and recess cells as well as the influence of the frontal sinus drainage pathway. Result: The 3D model of frontal sinus, frontal recess cells and frontal sinus drainage pathway were reconstructed successfully...
February 2018: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
https://www.readbyqxmd.com/read/29774924/fluorescence-resonance-energy-transfer-fret-based-nanoparticles-composed-of-aie-luminogens-and-nir-dyes-with-enhanced-three-photon-near-infrared-emission-for-in-vivo-brain-angiography
#11
Wen Liu, Yalun Wang, Xiao Han, Ping Lu, Liang Zhu, Chaowei Sun, Jun Qian, Sailing He
Near-infrared (NIR) fluorescence is very important for high-contrast biological imaging of high-scattering tissues such as brain tissue. Unfortunately, commercial NIR dyes are excited usually by visible light, and their multi-photon absorption (MPA) cross-sections are small. Here, we design new co-encapsulated NIR nanoparticles (NPs) with a large three-photon (3PA) absorption cross-section. A form of aggregation-induced emission (AIE) luminogen (AIEgen), 2,3-bis(4'-(diphenylamino)-[1,1'-biphenyl]-4-yl) fumaronitrile (TPATCN), is introduced as the donor, and a form of NIR dye, silicon 2,3-naphthalocyanine bis-(trihexylsilyloxide) (NIR775), is adopted as the acceptor...
May 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29774634/study-of-hyperpigmentation-in-human-skin-disorder-using-different-electron-microscopy-techniques
#12
Seulgi Noh, Hyosun Choi, Ji Soo Kim, Il-Hwan Kim, Ji Young Mun
There is a global trend of increase in the demand for three-dimensional electron microscopy with high resolution. The ultrastructural change and related functional studies are necessary to investigate biological phenomena. In this study, currently available 3D reconstruction techniques of electron microscopes (serial block-face scanning electron microscopy and focused ion beam-scanning electron microscopy) were used to investigate hyperpigmentary disorders in human skin. In the basal layer of the epidermis in the human skin, there are melanocytes that produce melanin and keratinocytes that act as a barrier against environmental damage...
May 18, 2018: Microscopy Research and Technique
https://www.readbyqxmd.com/read/29772676/three-dimensional-terahertz-coded-aperture-imaging-based-on-geometric-measures
#13
Shuo Chen, Xiaoqiang Hua, Hongqiang Wang, Chenggao Luo, Yongqiang Cheng, Bin Deng
For synthetic aperture radars, it is difficult to achieve forward-looking and staring imaging with high resolution. Fortunately, terahertz coded-aperture imaging (TCAI), an advanced radar imaging technology, can solve this problem by producing various irradiation patterns with coded apertures. However, three-dimensional (3D) TCAI has two problems, including a heavy computational burden caused by a large-scale reference signal matrix, and poor resolving ability at low signal-to-noise ratios (SNRs). This paper proposes a 3D imaging method based on geometric measures (GMs), which can reduce the computational burden and achieve high-resolution imaging for low SNR targets...
May 16, 2018: Sensors
https://www.readbyqxmd.com/read/29772259/photocatalytic-production-of-hydroxyl-radicals-by-commercial-tio-2-nanoparticles-and-phototoxic-hazard-identification
#14
Ying Tang, Rui Cai, Ding Cao, Xue Kong, Yongbo Lu
This study identifies the phototoxic potential of commercial titanium dioxide nanoparticles (TiO2 NPs) used in sunscreens and consumer products by employing a tiered testing approach comprising physicochemical, in vitro and ex vivo tests. Our results revealed that all the test samples of TiO2 NPs, varied in surface coating, crystallinity and primary particle size, produced hydroxyl radicals upon UVA photoexcitation as determined by electron spin resonance (ESR) spectroscopy. Their phototoxic potentials were assessed first by combining the validated 3T3 neutral red uptake phototoxicity test and red blood cell phototoxicity test and subsequently in ex vivo models of chick chorioallantoic membrane (CAM) and reconstructed human 3D skin model (H3D)...
May 14, 2018: Toxicology
https://www.readbyqxmd.com/read/29772066/3d-specific-absorption-rate-estimation-from-high-intensity-focused-ultrasound-sonications-using-the-green-s-function-heat-kernel
#15
Nicholas J Freeman, Henrik Odéen, Dennis L Parker
PURPOSE: Evaluate a numerical inverse Green's function method of deriving specific absorption rates (SARs) from high intensity focused ultrasound (HIFU) sonications given tissue parameters (thermal conductivity, specific heat capacity, and mass density) and 3-D magnetic resonance imaging (MRI) temperature measurements. METHODS: SAR estimates were evaluated using simulations and MR temperature measurements from HIFU sonications. For simulations, a "true" SAR was calculated using the hybrid angular spectrum method for ultrasound simulations...
May 17, 2018: Medical Physics
https://www.readbyqxmd.com/read/29771086/-design-of-cross-sectional-anatomical-model-focused-on-drainage-pathways-of-paranasal-sinuses
#16
Y Zha, W Lv, Y L Gao, Z Z Zhu, Z Q Gao
Objective: To design and produce cross-sectional anatomical models of paranasal sinuses for the purpose of demonstrating drainage pathways of each nasal sinus for the young doctors. Method: We reconstructed the three-dimensional model of sinuses area based on CT scan data, and divided it into 5 thick cross-sectional anatomy models by 4 coronal plane,which cross middle points of agger nasi cell, ethmoid bulla, posterior ethmoid sinuses and sphenoid sinus respectively. Then a 3D printerwas used to make anatomical cross-sectional anatomical models...
May 2018: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
https://www.readbyqxmd.com/read/29771036/-3d-computed-tomographic-study-of-concha-bullosa-drainage-pathway
#17
W H Zhang, Y L Zhao, X D Li
Objective: The aim of this study is to study the related structures with concha bullosa drainage passway in inpatients with concha bullosa disease. Method: A total of 90 patients with peritubular middle turbinate (144 sides) were examined by 16-slice spiral CT. The distribution of the middle turbinate and the distribution of the drainage channel were analyzed by three-dimensional reconstruction technique and image workstation software. Result: The distribution of the morphology and drainage channel of 144 concha bullosa have statistically significant ( P <0...
May 20, 2017: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
https://www.readbyqxmd.com/read/29769576/motion-compensated-micro-ct-reconstruction-for-in-situ-analysis-of-dynamic-processes
#18
Thomas De Schryver, Manuel Dierick, Marjolein Heyndrickx, Jeroen Van Stappen, Marijn A Boone, Luc Van Hoorebeke, Matthieu N Boone
This work presents a framework to exploit the synergy between Digital Volume Correlation (DVC) and iterative CT reconstruction to enhance the quality of high-resolution dynamic X-ray CT (4D-µCT) and obtain quantitative results from the acquired dataset in the form of 3D strain maps which can be directly correlated to the material properties. Furthermore, we show that the developed framework is capable of strongly reducing motion artifacts even in a dataset containing a single 360° rotation.
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29769312/the-chloroplast-division-protein-arc6-acts-to-inhibit-disassembly-of-gdp-bound-ftsz2
#19
Min Woo Sung, Rahamthulla Shaik, Allan D TerBush, Katherine W Osteryoung, Stanislav Vitha, Andreas Holzenburg
Chloroplasts host photosynthesis and fulfill other metabolic functions that are essential to plant life. They have to divide by binary fission to maintain their numbers throughout cycles of cell division. Chloroplast division is achieved by a complex ring-shaped division machinery located on both the inner (stromal) and the outer (cytosolic) side of the chloroplast envelope. The inner division ring (termed the Z ring) is formed by the assembly of tubulin-like FtsZ1 and FtsZ2 proteins. ARC6 is a key chloroplast division protein that interacts with the Z ring...
May 16, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29769139/double-bundle-anterior-cruciate-ligament-reconstruction-improves-tibial-rotational-instability-analysis-of-squatting-motion-using-a-2d-3d-registration-technique
#20
Kenichi Kidera, Akihiko Yonekura, Takeshi Miyaji, Yusuke Nakazoe, Kazuyoshi Gamada, Kei Yoneta, Futoshi Ikuta, Masato Tomita, Takashi Miyamoto, Shiro Kajiyama, Akira Hozumi, Ko Chiba, Narihiro Okazaki, Takayuki Shida, Makoto Osaki
BACKGROUND: The anterior cruciate ligament-deficient (ACLD) knee requires appropriate treatment for the patient to return to sports. The purpose of this study was to clarify the kinematics of the anterior cruciate ligament-deficient knee in squatting motion before and after double-bundle anterior cruciate ligament reconstruction (DB-ACLR) using a 2D/3D registration technique. METHODS: The subjects of this study were 10 men with confirmed unilateral ACL rupture who underwent DB-ACLR...
May 16, 2018: Journal of Orthopaedic Surgery and Research
keyword
keyword
54571
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"