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https://www.readbyqxmd.com/read/28343303/can-real-time-rgbd-enhance-intraoperative-cone-beam-ct
#1
Javad Fotouhi, Bernhard Fuerst, Wolfgang Wein, Nassir Navab
PURPOSE: Cone-Beam Computed Tomography (CBCT) is an important 3D imaging technology for orthopedic, trauma, radiotherapy guidance, angiography, and dental applications. The major limitation of CBCT is the poor image quality due to scattered radiation, truncation, and patient movement. In this work, we propose to incorporate information from a co-registered Red-Green-Blue-Depth (RGBD) sensor attached near the detector plane of the C-arm to improve the reconstruction quality, as well as correcting for undesired rigid patient movement...
March 25, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28340394/assessment-of-engineered-surfaces-roughness-by-high-resolution-3d-sem-photogrammetry
#2
L C Gontard, J D López-Castro, L González-Rovira, J M Vázquez-Martínez, F M Varela-Feria, M Marcos, J J Calvino
We describe a methodology to obtain three-dimensional models of engineered surfaces using scanning electron microscopy and multi-view photogrammetry (3DSEM). For the reconstruction of the 3D models of the surfaces we used freeware available in the cloud. The method was applied to study the surface roughness of metallic samples patterned with parallel grooves by means of laser. The results are compared with measurements obtained using stylus profilometry (PR) and SEM stereo-photogrammetry (SP). The application of 3DSEM is more time demanding than PR or SP, but it provides a more accurate representation of the surfaces...
March 7, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28338751/reduced-thickness-of-the-anterior-cingulate-cortex-in-individuals-with-an-at-risk-mental-state-who-later-develop-psychosis
#3
Yoichiro Takayanagi, Sue Kulason, Daiki Sasabayashi, Tsutomu Takahashi, Naoyuki Katagiri, Atsushi Sakuma, Chika Obara, Mihoko Nakamura, Mikio Kido, Atsushi Furuichi, Yumiko Nishikawa, Kyo Noguchi, Kazunori Matsumoto, Masafumi Mizuno, J Tilak Ratnanather, Michio Suzuki
BACKGROUND: Despite the fact that only a part of the individuals with at-risk mental state (ARMS) for psychosis do develop psychosis, biological markers of future transition to psychosis have not been well documented. Structural abnormality of the anterior cingulate gyrus (ACG), which probably exists prior to the onset of psychosis, could be such a risk marker. METHODS: We conducted a multicenter magnetic resonance imaging (MRI) study of 3 scanning sites in Japan...
January 30, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/28336879/in-vitro-and-in-vivo-evaluation-of-a-three-dimensional-porous-multi-walled-carbon-nanotube-scaffold-for-bone-regeneration
#4
Manabu Tanaka, Yoshinori Sato, Mei Zhang, Hisao Haniu, Masanori Okamoto, Kaoru Aoki, Takashi Takizawa, Kazushige Yoshida, Atsushi Sobajima, Takayuki Kamanaka, Hiroyuki Kato, Naoto Saito
Carbon nanotubes (CNTs) have attracted a great deal of attention for the biological and medical science fields because of their characteristic physical and biological properties. In this study, we investigated the capacity of the 3D porous CNT scaffold (CNT porous block; CNTp) for bone regenerative medicine. Surface observations using a scanning electron microscope (SEM), crystal depositions on the surface of CNTps immersed in simulated body fluid (SBF), and evaluations of protein adsorption and controlled releasing were conducted to assess physical properties...
February 17, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28333394/socket-shield-technique-for-immediate-implant-placement-clinical-radiographic-and-volumetric-data-after-5%C3%A2-years
#5
Daniel Bäumer, Otto Zuhr, Stephan Rebele, Markus Hürzeler
OBJECTIVES: Implant placement immediately after tooth extraction is often accompanied by resorption of surrounding tissues. A clinical technique was developed where the buccal portion of the root is retained to preserve the periodontal ligament and bundle bone. This technique is based on animal studies showing the potential to preserve the facial tissues utilizing this approach. The purpose of this study was to gain more insight regarding the safety of the technique with regard to biological and implant-related long-term complications and to observe the clinical appearance of the peri-implant tissues...
March 23, 2017: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/28328289/prospective-3d-analysis-of-facial-soft-tissue-augmentation-with-calcium-hydroxylapatite
#6
Filip Simunovic, Stefan Schlager, Michaela Montanari, Niklas Iblher
BACKGROUND: Facial rejuvenation is an expanding field with an increasing number of treatment modalities. Several non-autologous filler materials are available for soft tissue augmentation. Calcium hydroxylapatite (CaOH) is aimed at increasing collagen neosynthesis and thereby producing long term augmentation effects. Despite a multitude of observational reports, the field is suffering from lack of quantitative morphometic evaluation methods. OBJECTIVE: The objective of this proof-of-principle study was to investigate whether the effects of facial tissue augmentation with CaOH (Radiesse™) can be quantified and followed up using 3D surface scanning...
March 22, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28328041/sem-microphotogrammetry-a-new-take-on-an-old-method-for-generating-high-resolution-3d-models-from-sem-images
#7
A D Ball, P A Job, A E L Walker
The method we present here uses a scanning electron microscope programmed via macros to automatically capture dozens of images at suitable angles to generate accurate, detailed three-dimensional (3D) surface models with micron-scale resolution. We demonstrate that it is possible to use these Scanning Electron Microscope (SEM) images in conjunction with commercially available software originally developed for photogrammetry reconstructions from Digital Single Lens Reflex (DSLR) cameras and to reconstruct 3D models of the specimen...
March 22, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28327698/accuracy-and-reliability-of-different-cone-beam-computed-tomography-cbct-devices-for-structural-analysis-of-alveolar-bone-in-comparison-with-multislice-ct-and-micro-ct
#8
Jeroen Van Dessel, Laura Ferreira Pinheiro Nicolielo, Yan Huang, Walter Coudyzer, Benjamin Salmon, Ivo Lambrichts, Reinhilde Jacobs
OBJECTIVE: The aim of this study was to assess whether cone beam computed tomography (CBCT) may be used for clinically reliable alveolar bone quality assessment in comparison to its clinical alternatives, multislice computed tomography and the gold standard (micro-CT). MATERIALS AND METHODS: Six dentate mandibular bone samples were scanned with seven CBCT devices (ProMax 3D Max, NewTom GiANO, Cranex 3D, 3D Accuitomo 170, Carestream 9300, Scanora 3D, I-CAT Next generation), one micro-CT scanner (SkyScan 1174) and one MSCT machine (Somatom Definition Flash) using two protocols (standard and high-resolution)...
2017: European Journal of Oral Implantology
https://www.readbyqxmd.com/read/28322026/objective-3d-surface-evaluation-of-intracranial-electrophysiologic-correlates-of-cerebral-glucose-metabolic-abnormalities-in-children-with-focal-epilepsy
#9
Jeong-Won Jeong, Eishi Asano, Vinod Kumar Pilli, Yasuo Nakai, Harry T Chugani, Csaba Juhász
To determine the spatial relationship between 2-deoxy-2[(18) F]fluoro-D-glucose (FDG) metabolic and intracranial electrophysiological abnormalities in children undergoing two-stage epilepsy surgery, statistical parametric mapping (SPM) was used to correlate hypo- and hypermetabolic cortical regions with ictal and interictal electrocorticography (ECoG) changes mapped onto the brain surface. Preoperative FDG-PET scans of 37 children with intractable epilepsy (31 with non-localizing MRI) were compared with age-matched pseudo-normal pediatric control PET data...
March 21, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28317116/anatomical-segmentation-of-the-human-medial-prefrontal-cortex
#10
M Córcoles-Parada, Ncj Müller, M Ubero, V M Serrano-Del-Pueblo, F Mansilla, P Marcos-Rabal, E Artacho-Pérula, M Dresler, R Insausti, G Fernández, M Muñoz-López
The medial prefrontal areas 32, 24, 14, and 25 (mPFC) form part of the limbic memory system, but little is known about their functional specialization in humans. To add anatomical precision to structural and functional MRI data, we aimed to identify these mPFC subareas in histological preparations of human brain tissue, determine sulci most consistently related with mPFC areal boundaries, and use these sulci to delineate mPFC areas in MRIs. To achieve this, we obtained 3D MRI data from 11 ex vivo hemispheres and processed them for cyto- and myelo-architectonic analysis...
March 20, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28306546/substitute-ct-generation-from-a-single-ultra-short-time-echo-mri-sequence-preliminary-study
#11
Soumya Ghose, Jason A Dowling, Robba Rai, Gary P Liney
In MR guided radiation therapy planning both MR and CT images for a patient are acquired and co-registered to obtain a tissue specific HU map. Generation of the HU map directly from the MRI would eliminate the CT acquisition and may improve radiation therapy planning. In this preliminary study of substitute CT (sCT) generation, two porcine leg phantoms were scanned using a 3D ultrashort echo time (PETRA) sequence and co-registered to corresponding CT images to build tissue specific regression models. The model was created from one co-registered CT-PETRA pair to generate the sCT for the other PETRA image...
March 17, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28295386/an-integrated-segmentation-and-shape-based-classification-scheme-for-distinguishing-adenocarcinomas-from-granulomas-on-lung-ct
#12
Mehdi Alilou, Niha Beig, Mahdi Orooji, Anant Madabhushi, Prabhakar Rajiah, Michael Yang, Robert Gilkeson, Philip Linden, Vamsidhar Velcheti, Sagar Rakshit, Niyoti Reddy, Frank Jacono
PURPOSE: Distinguishing between benign granulmoas and adenocarcinomas is confounded by their similar visual appearance on routine CT scans. Unfortunately, owing to the inability to discriminate these lesions radigraphically, many patients with benign granulomas are subjected to unnecessary surgical wedge resections and biopsies for pathologic confirmation of cancer presence or absence. This suggests the need for improved computerized characterization of these nodules in order to distinguish between these two classes of lesions on CT scans...
March 14, 2017: Medical Physics
https://www.readbyqxmd.com/read/28288684/accuracy-of-magnetic-resonance-imaging-to-detect-cartilage-loss-in-severe-osteoarthritis-of-the-first-carpometacarpal-joint-comparison-with-histological-evaluation
#13
Michael S Saltzherr, J Henk Coert, Ruud W Selles, Johan W van Neck, Jean-Bart Jaquet, Gerjo J V M van Osch, Edwin H G Oei, Jolanda J Luime, Galied S R Muradin
BACKGROUND: Magnetic resonance imaging (MRI) is increasingly used for research in hand osteoarthritis, but imaging the thin cartilage layers in the hand joints remains challenging. We therefore assessed the accuracy of MRI in detecting cartilage loss in patients with symptomatic osteoarthritis of the first carpometacarpal (CMC1) joint. METHODS: Twelve patients scheduled for trapeziectomy to treat severe symptomatic osteoarthritis of the CMC1 joint underwent a preoperative high resolution 3D spoiled gradient (SPGR) MRI scan...
March 14, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28284651/high-resolution-3d-confocal-microscope-imaging-of-volcanic-ash-particles
#14
David Wertheim, Gavin Gillmore, Ian Gill, Nick Petford
We present initial results from a novel high resolution confocal microscopy study of the 3D surface structure of volcanic ash particles from two recent explosive basaltic eruptions, Eyjafjallajökull (2010) and Grimsvötn (2011), in Iceland. The majority of particles imaged are less than 100μm in size and include PM10s, known to be harmful to humans if inhaled. Previous studies have mainly used 2D microscopy to examine volcanic particles. The aim of this study was to test the potential of 3D laser scanning confocal microscopy as a reliable analysis tool for these materials and if so to what degree high resolution surface and volume data could be obtained that would further aid in their classification...
March 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28282551/novel-fractal-characteristic-of-atomic-force-microscopy-images
#15
Maria N Starodubtseva, Ivan E Starodubtsev, Evgenii G Starodubtsev
Fractal dimension (DF) is one of the important parameters in the description of object's properties in different fields including biology and medicine. The present paper is focused on the application of the fractal dimension (the box counting dimension) in the analysis of the properties of cell surface on the base of its images obtained by atomic force microscopy (AFM). Fractal dimension of digital 3D AFM images depends on interpoint distances determined by the scanning step in the XY-plane and Z-scale factor t...
May 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28278383/3d-printed-poly-%C3%AE%C2%B5-caprolactone-scaffold-augmented-with-mesenchymal-stem-cells-for-total-meniscal-substitution
#16
Zheng-Zheng Zhang, Shao-Jie Wang, Ji-Ying Zhang, Wen-Bo Jiang, Ai-Bing Huang, Yan-Song Qi, Jian-Xun Ding, Xue-Si Chen, Dong Jiang, Jia-Kuo Yu
BACKGROUND: Total meniscectomy leads to knee osteoarthritis in the long term. The poly(ε-caprolactone) (PCL) scaffold is a promising material for meniscal tissue regeneration, but cell-free scaffolds result in relatively poor tissue regeneration and lead to joint degeneration. HYPOTHESIS: A novel, 3-dimensional (3D)-printed PCL scaffold augmented with mesenchymal stem cells (MSCs) would offer benefits in meniscal regeneration and cartilage protection. STUDY DESIGN: Controlled laboratory study...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28274212/analysis-of-the-three-dimensional-anatomical-variance-of-the-distal-radius-using-3d-shape-models
#17
Sebastian F Baumbach, Jakob Binder, Alexander Synek, Fabian G Mück, Yan Chevalier, Ekkehard Euler, Georg Langs, Lukas Fischer
BACKGROUND: Various medical fields rely on detailed anatomical knowledge of the distal radius. Current studies are limited to two-dimensional analysis and biased by varying measurement locations. The aims were to 1) generate 3D shape models of the distal radius and investigate variations in the 3D shape, 2) generate and assess morphometrics in standardized cut planes, and 3) test the model's classification accuracy. METHODS: The local radiographic database was screened for CT-scans of intact radii...
March 9, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28272256/a-morphometric-study-of-the-middle-and-lower-cervical-vertebral-endplates-and-their-components
#18
Hang Feng, Xiang-Yi Fang, Da-Geng Huang, Cheng-Cheng Yu, Hou-Kun Li, Song-Chuan Zhao, Chao-Yuan Ge, Ru-Hai Bai, Ding-Jun Hao
Cervical disc arthroplasty is a common method of treating cervical degenerative disease. However, the footprints of most prosthesis dimensions are obtained from data of Caucasian individuals. Besides, there is a large discrepancy between footprints of currently available cervical disc prostheses and anatomic dimensions of cervical endplates. We aimed to detail the three-dimensional (3D) anatomic morphology of the subaxial cervical vertebral endplate, utilizing high-precision, high-resolution scanning equipment, and provide a theoretical basis for designing appropriate disc prostheses for Chinese patients...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28271628/zinc-oxide-3d-microstructures-as-an-antimicrobial-filler-content-for-composite-resins
#19
Hércules Bezerra Dias, Maria Inês Basso Bernardi, Matheus Aparecido Dos Santos Ramos, Tamara Carolina Trevisan, Taís Maria Bauab, Antônio Carlos Hernandes, Alessandra Nara de Souza Rastelli
The aim of this study was to evaluate the antibacterial activity of a composite resin modified by 3D zinc oxide (ZnO) microstructures and to verify possible alterations on its mechanical properties. ZnO was synthesized by hydrothermal approach and characterized by X-ray diffraction (XRD), surface area by Brunauer, Emmett and Teller (BET), Fourier transform infrared spectroscopy (FTIR) and Field emission scanning electron microscopy (FESEM). The minimum inhibitory concentrations of ZnO against Streptococcus mutans, Escherichia coli, Staphylococcus aureus, and Candida albicans were determinated...
March 8, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28269720/preliminary-study-on-the-automated-skull-fracture-detection-in-ct-images-using-black-hat-transform
#20
Ayumi Yamada, Atsushi Teramoto, Tomoko Otsuka, Kohei Kudo, Hirofumi Anno, Hiroshi Fujita
Linear skull fracture, following head trauma, may reach major blood vessels, such as the middle meningeal artery or sinus venosus, and may cause epidural hematoma. However, hematoma is likely to be missed in the initial interpretation because it spreads only gradually. In addition, the fracture lines that run along the scan slice plane are often missed during initial interpretation. In this study, we develop a novel method for automated detection of the linear skull fracture using head computed tomography (CT) images and conduct a basic evaluation using digital phantom and head phantom that enclose genuine human bones...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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