keyword
MENU ▼
Read by QxMD icon Read
search

3D scan

keyword
https://www.readbyqxmd.com/read/28922280/time-demand-and-radiation-dose-in-3d-fluoroscopy-based-navigation-assisted-3d-fluoroscopy-controlled-pedicle-screw-instrumentations
#1
Horst Balling
STUDY DESIGN: Prospective single-center cohort study to record additional time requirements and radiation dose in navigation-assisted O-arm-controlled pedicle screw (PS) instrumentations. OBJECTIVE: To evaluate amount of extra-time and radiation dose for navigation-assisted PS instrumentations of the thoracolumbosacral spine using O-arm 3D-real-time-navigation (O3DN) compared to non-navigated spinal procedures (NNSP) with a single C-arm and postoperative computed tomography (CT) scan for controlling PS positions...
September 15, 2017: Spine
https://www.readbyqxmd.com/read/28921912/fate-of-worn-out-functional-teeth-in-the-upper-jaw-dentition-of-sicyopterus-japonicus-gobioidei-sicydiinae-during-tooth-replacement
#2
Noriyuki Sahara, Keita Moriyama, Midori Iida, Shun Watanabe
Mochizuki and Fukui (1983) studied the development and replacement of the upper jaw teeth in a Japanese fish species, Sicyopterus japonicus (Gobioidei: Sicydiinae), and they reported that worn-out functional teeth in the upper jaw were not shed outside the skin but were taken into the soft tissue of the upper jaw and completely resorbed there. To date, however, this phenomenon appears poorly documented. Furthermore, the mechanism for the resorption of these teeth remains to be determined. In the present study, we examined this phenomenon by using 3D micro-computed tomography (m-CT), scanning electron microscopy (SEM), and various techniques of light (LM) and electron (EM) microcopy...
September 16, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28921588/integrating-prior-information-into-microwave-tomography-part-2-impact-of-errors-in-prior-information-on-microwave-tomography-image-quality
#3
Douglas Kurrant, Anastasia Baran, Joe LoVetri, Elise Fear
PURPOSE: The authors have developed a method to combine a patient-specific map of tissue structure and average dielectric properties with microwave tomography. The patient-specific map is acquired with radar-based techniques and serves as prior information for microwave tomography. The impact that the degree of structural detail included in this prior information has on image quality was reported in a previous investigation. The aim of the present study is to extend this previous work by identifying and quantifying the impact that errors in the prior information have on image quality, including the reconstruction of internal structures and lesions embedded in fibroglandular tissue...
September 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28921580/integrating-prior-information-into-microwave-tomography-part-1-impact-of-detail-on-image-quality
#4
Douglas Kurrant, Anastasia Baran, Joe LoVetri, Elise Fear
PURPOSE: The authors investigate the impact that incremental increases in the level of detail of patient-specific prior information have on image quality and the convergence behavior of an inversion algorithm in the context of near-field microwave breast imaging. A methodology is presented that uses image quality measures to characterize the ability of the algorithm to reconstruct both internal structures and lesions embedded in fibroglandular tissue. The approach permits key aspects that impact the quality of reconstruction of these structures to be identified and quantified...
September 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28918765/three-dimensional-3d-nanometrology-based-on-scanning-electron-microscope-sem-stereophotogrammetry
#5
Vipin N Tondare, John S Villarrubia, András E Vlada R
Three-dimensional (3D) reconstruction of a sample surface from scanning electron microscope (SEM) images taken at two perspectives has been known for decades. Nowadays, there exist several commercially available stereophotogrammetry software packages. For testing these software packages, in this study we used Monte Carlo simulated SEM images of virtual samples. A virtual sample is a model in a computer, and its true dimensions are known exactly, which is impossible for real SEM samples due to measurement uncertainty...
September 18, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28917880/intercalated-chitosan-hydroxyapatite-nanocomposites-promising-materials-for-bone-tissue-engineering-applications
#6
Muhammad Anwaar Nazeer, Emel Yilgör, Iskender Yilgör
Preparation and characterization of chitosan/hydroxyapatite (CS/HA) nanocomposites displaying an intercalated structure is reported. Hydroxyapatite was synthesized through sol-gel process. Formic acid was introduced as a new solvent to obtain stable dispersions of nano-sized HA particles in polymer solution. CS/HA dispersions with HA contents of 5, 10 and 20% by weight were prepared. Self-assembling of HA nanoparticles during the drying of the solvent cast films led to the formation of homogeneous CS/HA nanocomposites...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28915835/macular-retinal-and-choroidal-thickness-in-unilateral-amblyopia-using-swept-source-optical-coherence-tomography
#7
Syunsuke Araki, Atsushi Miki, Katsutoshi Goto, Tsutomu Yamashita, Go Takizawa, Kazuko Haruishi, Yoshiaki Ieki, Junichi Kiryu, Kiyoshi Yaoeda
BACKGROUND: To investigate macular retinal and choroidal thickness in amblyopic eyes compared to that in fellow and normal eyes using swept-source optical coherence tomography (SS-OCT). METHODS: This study examined 31 patients with hyperopic anisometropic amblyopia (6.9 ± 3.8 years, mean ± standard deviation), 15 patients with strabismic amblyopia without anisometropia (7.9 ± 4.2 years), and 24 age-matched controls (7.8 ± 3.3 years). Retinal and choroidal thickness was measured by 3D scans using SS-OCT...
September 15, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28914982/production-of-accurate-skeletal-models-of-domestic-animals-using-three-dimensional-scanning-and-printing-technology
#8
Fangzheng Li, Chunying Liu, Xuexiong Song, Yanjun Huan, Shansong Gao, Zhongling Jiang
Access to adequate anatomical specimens can be an important aspect in learning the anatomy of domestic animals. In this study, the authors utilized a structured light scanner and fused deposition modeling (FDM) printer to produce highly accurate animal skeletal models. First, various components of the bovine skeleton, including the femur, the fifth rib, and the sixth cervical (C6) vertebra were used to produce digital models. These were then used to produce 1:1 scale physical models with the FDM printer. The anatomical features of the digital models and three-dimensional (3D) printed models were then compared with those of the original skeletal specimens...
September 15, 2017: Anatomical Sciences Education
https://www.readbyqxmd.com/read/28914408/3d-volumetry-and-its-correlation-between-postoperative-gastric-volume-and-excess-weight-loss-after-sleeve-gastrectomy
#9
Andrés Hanssen, Sergio Plotnikov, Geylor Acosta, José Tomas Nuñez, José Haddad, Carmen Rodriguez, Claudia Petrucci, Diego Hanssen, Rafael Hanssen
BACKGROUND: The volume of the postoperative gastric remnant is a key factor in excess weight loss (EWL) after sleeve gastrectomy (SG). Traditional methods to estimate gastric volume (GV) after bariatric procedures are often inaccurate; usually conventional biplanar contrast studies are used. METHODS: Thirty patients who underwent SG were followed prospectively and evaluated at 6 months after the surgical procedure, performing 3D CT reconstruction and gastric volumetry, to establish its relationship with EWL...
September 15, 2017: Obesity Surgery
https://www.readbyqxmd.com/read/28913513/choroidal-thickness-in-non-ocular-beh%C3%A3-et-s-disease-a-spectral-domain-oct-study
#10
Aman Mittal, Swetha Bindu Velaga, Khalil Ghasemi Falavarjani, Muneeswar G Nittala, Srinivas R Sadda
PURPOSE: To evaluate choroidal thickness in patients with non-ocular Behçet's disease (BD) using spectral domain optical coherence tomography (SD-OCT) and to compare the results to normal eyes. METHODS: In this retrospective observational comparative study, we collected OCT and clinical data from the charts of 4 patients (7 eyes) with BD who had been referred for a screening eye exam and had a normal ocular examination. Data from 9 healthy volunteers (17 eyes) were collected as age-matched controls...
September 2017: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/28912940/technical-report-on-the-modification-of-3-dimensional-non-contact-human-body-laser-scanner-for-the-measurement-of-anthropometric-dimensions-verification-of-its-accuracy-and-precision
#11
Akram Sadat Jafari Roodbandi, Hamid Naderi, Naser Hashenmi-Nejad, Alireza Choobineh, Mohammad Reza Baneshi, Vafa Feyzi
Introduction: Three-dimensional (3D) scanners are widely used in medicine. One of the applications of 3D scanners is the acquisition of anthropometric dimensions for ergonomics and the creation of an anthropometry data bank. The aim of this study was to evaluate the precision and accuracy of a modified 3D scanner fabricated in this study. Methods: In this work, a 3D scan of the human body was obtained using DAVID Laser Scanner software and its calibration background, a linear low-power laser, and one advanced webcam...
2017: Journal of Lasers in Medical Sciences
https://www.readbyqxmd.com/read/28912723/increased-hemodynamic-load-in-early-embryonic-stages-alters-myofibril-and-mitochondrial-organization-in-the-myocardium
#12
Madeline Midgett, Claudia S López, Larry David, Alina Maloyan, Sandra Rugonyi
Normal blood flow is essential for proper heart formation during embryonic development, as abnormal hemodynamic load (blood pressure and shear stress) results in cardiac defects seen in congenital heart disease (CHD). However, the detrimental remodeling processes that relate altered blood flow to cardiac malformation and defects remain unclear. Heart development is a finely orchestrated process with rapid transformations that occur at the tissue, cell, and subcellular levels. Myocardial cells play an essential role in cardiac tissue maturation by aligning in the direction of stretch and increasing the number of contractile units as hemodynamic load increases throughout development...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28912044/sex-estimation-in-a-contemporary-turkish-population-based-on-ct-scans-of-the-calcaneus
#13
Oguzhan Ekizoglu, Ercan Inci, Figen Bakirtas Palabiyik, Ismail Ozgur Can, Ali Er, Mustafa Bozdag, Ismail Eralp Kacmaz, Elena F Kranioti
Building a reliable biological profile from decomposed remains depends heavily on the accurate estimation of sex. A variety of methods based on every single skeletal element have been developed over the years for different populations employing both osteological and virtual methods. The latter seem to be a reasonable alternative in countries lacking osteological reference collections. The current study used 3D virtual models of calcanei from CT scans of living adults to develop a sex estimation method for contemporary Turkish...
August 4, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28910761/phantomless-auto-calibration-and-online-calibration-assessment-for-a-tracked-freehand-2d-ultrasound-probe
#14
Matthew Toews, William M Wells
This paper presents a method for automatically calibrating and assessing the calibration quality of an externally tracked 2D ultrasound (US) probe by scanning arbitrary, natural tissues, as opposed a specialized calibration phantom as is the typical practice. A generative topic model quantifies the posterior probability of calibration parameters conditioned on local 2D image features arising from a generic underlying substrate. Autocalibration is achieved by identifying the maximum a-posteriori (MAP) image-to-probe transform, and calibration quality is assessed online in terms of the posterior probability of the current image-to-probe transform...
September 11, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28910497/tuning-surface-structure-of-3d-nanoporous-gold-by-surfactant-free-electrochemical-potential-cycling
#15
Zhili Wang, Shoucong Ning, Pan Liu, Yi Ding, Akihiko Hirata, Takeshi Fujita, Mingwei Chen
3D dealloyed nanoporous metals have emerged as a new class of catalysts for various chemical and electrochemical reactions. Similar to other heterogeneous catalysts, the surface atomic structure of the nanoporous metal catalysts plays a crucial role in catalytic activity and selectivity. Through surfactant-assisted bottom-up synthesis, the surface-structure modification has been successfully realized in low-dimensional particulate catalysts. However, the surface modification by top-down dealloying has not been well explored for nanoporous metal catalysts...
September 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28906434/surface-profiling-and-core-evaluation-of-aluminum-honeycomb-sandwich-aircraft-panels-using-multi-frequency-eddy-current-testing
#16
Tyler Reyno, P Ross Underhill, Thomas W Krause, Catharine Marsden, Diane Wowk
Surface damage on honeycomb aircraft panels is often measured manually, and is therefore subject to variation based on inspection personnel. Eddy current testing (ECT) is sensitive to variations in probe-to-specimen spacing, or lift-off, and is thus promising for high-resolution profiling of surface damage on aluminum panels. Lower frequency testing also allows inspection through the face sheet, an advantage over optical 3D scanning methods. This paper presents results from the ECT inspection of surface damage on an approximately flat aluminum honeycomb aircraft panel, and compares the measurements to those taken using optical 3D scanning technology...
September 14, 2017: Sensors
https://www.readbyqxmd.com/read/28906410/augmented-reality-navigation-in-open-surgery-for-hilar-cholangiocarcinoma-resection-with-hemihepatectomy-using-video-based-in-situ-three-dimensional-anatomical-modeling-a-case-report
#17
Rui Tang, Longfei Ma, Canhong Xiang, Xuedong Wang, Ang Li, Hongen Liao, Jiahong Dong
RATIONALE: Patients who undergo hilar cholangiocarcinoma (HCAC) resection with concomitant hepatectomy have a high risk of postoperative morbidity and mortality due to surgical trauma to the hepatic and biliary vasculature. PATIENT CONCERNS: A 58-year-old Chinese man with yellowing skin and sclera, abdominal distension, pruritus, and anorexia for approximately 3 weeks. DIAGNOSES: Magnetic resonance cholangiopancreatography and enhanced computed tomography (CT) scanning revealed a mass over the biliary tree at the porta hepatis, which diagnosed to be s a hilar cholangiocarcinoma...
September 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28905452/influence-of-scanning-rate-on-quality-of-afm-image-study-of-surface-statistical-metrics
#18
Dinara Sobola, Ştefan Ţălu, Shahram Solaymani, Lubomír Grmela
The purpose of this work is to study the dependence of AFM-data reliability on scanning rate. The three-dimensional (3D) surface topography of the samples with different micro-motifs is investigated. The analysis of surface metrics for estimation of artifacts from inappropriate scanning rate is presented. Fractal analysis was done by cube counting method and evaluation of statistical metrics was carrying out on the basis of AFM-data. Combination of quantitate parameters is also presented in graphs for every measurement...
September 14, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28905416/sar-and-scan-time-optimized-3d-whole-brain-double-inversion-recovery-imaging-at-7t
#19
Eberhard D Pracht, Thorsten Feiweier, Philipp Ehses, Daniel Brenner, Alard Roebroeck, Bernd Weber, Tony Stöcker
PURPOSE: The aim of this project was to implement an ultra-high field (UHF) optimized double inversion recovery (DIR) sequence for gray matter (GM) imaging, enabling whole brain coverage in short acquisition times ( ≈5 min, image resolution 1 mm(3) ). METHODS: A 3D variable flip angle DIR turbo spin echo (TSE) sequence was optimized for UHF application. We implemented an improved, fast, and specific absorption rate (SAR) efficient TSE imaging module, utilizing improved reordering...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28905413/simultaneous-acquisition-sequence-for-improved-hepatic-pharmacokinetics-quantification-accuracy-saha-for-dynamic-contrast-enhanced-mri-of-liver
#20
Jia Ning, Yongliang Sun, Sheng Xie, Bida Zhang, Feng Huang, Peter Koken, Jouke Smink, Chun Yuan, Huijun Chen
PURPOSE: To propose a simultaneous acquisition sequence for improved hepatic pharmacokinetics quantification accuracy (SAHA) method for liver dynamic contrast-enhanced MRI. METHODS: The proposed SAHA simultaneously acquired high temporal-resolution 2D images for vascular input function extraction using Cartesian sampling and 3D large-coverage high spatial-resolution liver dynamic contrast-enhanced images using golden angle stack-of-stars acquisition in an interleaved way...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
keyword
keyword
71155
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"