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3D surface imaging

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https://www.readbyqxmd.com/read/29240637/the-boomerang-lift-a-3-step-compartment-based-approach-to-the-youthful-cheek
#1
Jillian E Schreiber, Jordan Terner, Carrie S Stern, Javier Beut, Elizabeth B Jelks, Glenn W Jelks, Oren M Tepper
BACKGROUND: Autologous fat grafting (AFG) is an important tool for plastic surgeons treating the aging face. Malar augmentation with fat is often targeted to restore the youthful facial contour and provides support to the lower eyelid. The existence of distinct facial fat compartments suggests a step-wise approach may be appropriate in this regard [1]. Here we describe a three-step approach to malar augmentation using targeted deep malar fat compartmental augmentation, termed the "Boomerang Lift"...
December 13, 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29240235/three-dimensional-digital-reconstruction-of-skin-epidermis-and-dermis
#2
P Liu, J-Y Zhu, B Tang, Z-C Hu
This study describes how three-dimensional (3D) human skin tissue is reconstructed, and provides digital anatomical data for the physiological structure of human skin tissue based on large-scale thin serial sections. Human skin samples embedded in paraffin were cut serially into thin sections and then stained with hematoxylin-eosin. Images of serial sections obtained from lighting microscopy were scanned and aligned by the scale-invariant feature transform algorithm. 3D reconstruction of the skin tissue was generated using Mimics software...
December 14, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/29238397/a-method-to-generate-the-surface-cell-layer-of-the-3d-virtual-shoot-apex-from-apical-initials
#3
Krzysztof Kucypera, Marcin Lipowczan, Anna Piekarska-Stachowiak, Jerzy Nakielski
Background: The development of cell pattern in the surface cell layer of the shoot apex can be investigated in vivo by use of a time-lapse confocal images, showing naked meristem in 3D in successive times. However, how this layer is originated from apical initials and develops as a result of growth and divisions of their descendants, remains unknown. This is an open area for computer modelling. A method to generate the surface cell layer is presented on the example of the 3D paraboloidal shoot apical dome...
2017: Plant Methods
https://www.readbyqxmd.com/read/29238114/quantitative-evaluation-of-performance-of-3d-printed-lenses
#4
John Gawedzinski, Michal E Pawlowski, Tomasz S Tkaczyk
We present an analysis of the shape, surface quality, and imaging capabilities of custom 3D printed lenses. 3D printing technology enables lens prototypes to be fabricated without restrictions on surface geometry. Thus, spherical, aspherical and rotationally non-symmetric lenses can be manufactured in an integrated production process. This technique serves as a noteworthy alternative to multistage, labor-intensive, abrasive processes such as grinding, polishing and diamond turning. Here, we evaluate the quality of lenses fabricated by Luxexcel using patented Printoptical© technology that is based on an inkjet printing technique by comparing them to lenses made with traditional glass processing technologies (grinding, polishing etc...
2017: Optical Engineering: the Journal of the Society of Photo-optical Instrumentation Engineers
https://www.readbyqxmd.com/read/29230178/human-cardiac-31p-mr-spectroscopy-at-3-tesla-cannot-detect-failing-myocardial-energy-homeostasis-during-exercise
#5
Adrianus J Bakermans, Jason N Bazil, Aart J Nederveen, Gustav J Strijkers, S Matthijs Boekholdt, Daniel A Beard, Jeroen A L Jeneson
Phosphorus-31 magnetic resonance spectroscopy (31P-MRS) is a unique non-invasive imaging modality for probing in vivo high-energy phosphate metabolism in the human heart. We investigated whether current 31P-MRS methodology would allow for clinical applications to detect exercise-induced changes in (patho-)physiological myocardial energy metabolism. Hereto, measurement variability and repeatability of three commonly used localized 31P-MRS methods [3D image-selected in vivo spectroscopy (ISIS) and 1D ISIS with 1D chemical shift imaging (CSI) oriented either perpendicular or parallel to the surface coil] to quantify the myocardial phosphocreatine (PCr) to adenosine triphosphate (ATP) ratio in healthy humans (n = 8) at rest were determined on a clinical 3 Tesla MR system...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29229812/perception-and-misperception-of-surface-opacity
#6
Phillip J Marlow, Juno Kim, Barton L Anderson
A fundamental problem in extracting scene structure is distinguishing different physical sources of image structure. Light reflected by an opaque surface covaries with local surface orientation, whereas light transported through the body of a translucent material does not. This suggests the possibility that the visual system may use the covariation of local surface orientation and intensity as a cue to the opacity of surfaces. We tested this hypothesis by manipulating the contrast of luminance gradients and the surface geometries to which they belonged and assessed how these manipulations affected the perception of surface opacity/translucency...
December 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29229239/in-vivo-postoperative-motion-analysis-of-metal-and-ceramic-bipolar-hip-hemiarthroplasty
#7
Toru Yoshioka, Nobukazu Okimoto, Yoshifumi Fuse, Makoto Kawasaki, Toshiharu Mori, Akinori Sakai, Tokifumi Majima
BACKGROUND: We hypothesized that ceramic bipolar shows less impingement between stem neck and outer head compared to metal bipolar, because of its low coefficient of friction with the acetabulum cartilage. In this paper, a three dimensional (3D) postoperative motion analysis has been used to assess the different motion characteristics of metal and ceramic bipolar hip hemiarthroplasty systems. METHODS: This study was conducted on 40 patients divided in two matched cohorts: 20 patients with metal bipolar and 20 patients with the ceramic bipolar...
December 8, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/29226023/evaluating-the-whitening-and-microstructural-effects-of-a-novel-whitening-strip-on-porcelain-and-composite-dental-materials
#8
Thair Takesh, Anik Sargsyan, Matthew Lee, Afarin Anbarani, Jessica Ho, Petra Wilder-Smith
Aims: The aim of this project was to evaluate the effects of 2 different whitening strips on color, microstructure and roughness of tea stained porcelain and composite surfaces. Methods: 54 porcelain and 72 composite chips served as samples for timed application of over-the-counter (OTC) test or control dental whitening strips. Chips were divided randomly into three groups of 18 porcelain and 24 composite chips each. Of these groups, 1 porcelain and 1 composite set served as controls...
August 2017: Dentistry: Current Research
https://www.readbyqxmd.com/read/29220379/zebrafish-skeleton-development-high-resolution-micro-ct-and-fib-sem-block-surface-serial-imaging-for-phenotype-identification
#9
Jeremie Silvent, Anat Akiva, Vlad Brumfeld, Natalie Reznikov, Katya Rechav, Karina Yaniv, Lia Addadi, Steve Weiner
Although bone is one of the most studied living materials, many questions about the manner in which bones form remain unresolved, including fine details of the skeletal structure during development. In this study, we monitored skeleton development of zebrafish larvae, using calcein fluorescence, high-resolution micro-CT 3D images and FIB-SEM in the block surface serial imaging mode. We compared calcein staining of the skeletons of the wild type and nacre mutants, which are transparent zebrafish, with micro-CT for the first 30 days post fertilization embryos, and identified significant differences...
2017: PloS One
https://www.readbyqxmd.com/read/29217342/cinematic-rendering-of-cardiac-ct-volumetric-data-principles-and-initial-observations
#10
Steven P Rowe, Pamela T Johnson, Elliot K Fishman
BACKGROUND: Cinematic rendering (CR) a new method of 3D computed tomography (CT) volumetric visualization that produces photorealistic images. As with traditional 3D visualization methods, CR may prove to be of value in providing important information when evaluating regions of complex anatomy such as the heart. METHODS: The gated, IV contrast-enhanced chest CT angiogram data from three recent patients were evaluated with CR. Image comparision demonstrates the difference between CR and traditional volume rendering (VR), owing to a more complex lighting model that enhances surface detail and produces realistic shadows to add depth to 3D visualizations...
December 2, 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/29216604/digital-holographic-microscopy-for-3d-surface-characterization-of-polymeric-nanocomposites
#11
Vahid Abbasian, Ehsan A Akhlaghi, Mohammad A Charsooghi, Maasoomeh Bazzar, Ali-Reza Moradi
The aim of this paper is to introduce digital holographic microscopy (DHM) as a non-contact, inexpensive, and non-abrasive method for 3D surface characterization of polymeric nanocomposites. A common-path and vibration-immune Mirau system with a microsphere-assisted arrangement is utilized to increase the lateral resolution of the images. The characterization is performed through the measurement of roughness parameters of the surfaces, which are derived from the recorded holograms. Pure poly(triazole-amide-imide) (PTAI) and PTAI nanocomposite reinforeced with surface modified TiO2 nanoparticles (MN-TiO2) are used and compared...
November 28, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/29215821/a-fast-3-dimensional-magnetic-resonance-imaging-reconstruction-for-surgical-planning-of-uterine-myomectomy
#12
Sa Ra Lee, Young Jae Kim, Kwang Gi Kim
BACKGROUND: Uterine myoma is the most common benign gynecologic tumor in reproductive-aged women. During myomectomy for women who want to preserve fertility, it is advisable to detect and remove all myomas to decrease the risk of additional surgery. However, finding myomas during surgery is often challenging, especially for deep-seated myomas. Therefore, three-dimensional (3D) preoperative localization of myomas can be helpful for the surgical planning for myomectomy. However, the previously reported manual 3D segmenting method takes too much time and effort for clinical use...
January 8, 2018: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/29212544/plaque-volume-and-plaque-risk-profile-in-diabetic-vs-non-diabetic-patients-undergoing-lipid-lowering-therapy-a-study-based-on-3d-intravascular-ultrasound-and-virtual-histology
#13
Tomas Kovarnik, Zhi Chen, Gary S Mintz, Andreas Wahle, Kristyna Bayerova, Ales Kral, Martin Chval, Karel Kopriva, John Lopez, Milan Sonka, Ales Linhart
BACKGROUND: Coronary atherosclerosis progresses faster in patients with diabetes mellitus (DM) and causes higher morbidity and mortality in such patients compared to non-diabetics ones (non-DM). We quantify changes in plaque volume and plaque phenotype during lipid-lowering therapy in DM versus non-DM patients using advanced intracoronary imaging. METHODS: We analyzed data from 61 patients with stable angina pectoris included to the PREDICT trial searching for prediction of plaque changes during intensive lipid-lowering therapy (40 mg rosuvastatin daily)...
December 7, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/29211127/evaluation-of-stress-distribution-in-endodontically-weakened-teeth-restored-with-different-crown-materials-3d-fea-analysis
#14
Izabela C M Moris, Carolina Alves Moscardini, Luana Kelle Batista Moura, Yara Teresinha Corrêa Silva-Sousa, Erica Alves Gomes
This study evaluated the stress distribution in endodontically treated teeth, weakened (W) or not weakened (NW), restored with different materials of prosthetic crown using 3D-FEA. Models of a maxillary canine were constructed based on micro-CT images and divided into the groups: G1 (control) - sound tooth; G2 to G7 - endodontically treated teeth restored with glass fiber post (GFP); which G2 to G4 simulated NW root and G5 to G7 simulated W root. For crown material the teeth were restored with: G2 and G5: metallic coping and ceramic veneering, G3 and G6: zirconia coping and ceramic veneering, G4 and G7: alumina coping and ceramic veneering...
November 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29211088/multi-size-spheroid-formation-using-microfluidic-funnels
#15
M Marimuthu, N Rousset, A St-Georges-Robillard, M A Lateef, M Ferland, A-M Mes-Masson, T Gervais
We present a microfluidic platform for automatic multi-size spheroid formation within constant volume hanging droplets (HDs) from a single inlet loading of a constant cell concentration. The platform introduces three technological improvements over the existing spheroid formation platforms: 1) cell seeding control is achieved by enrichment of a cell solution rather than dilution; 2) cell seeding in each HD is fully independent and pre-programmable at the design stage; 3) the fabricated chip operates well using a hydrophobic PDMS surface, ensuring long-term storage possibility for device usage...
December 6, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/29208235/modelling-the-effect-of-intervillous-flow-on-solute-transfer-based-on-3d-imaging-of-the-human-placental-microstructure
#16
S Perazzolo, R M Lewis, B G Sengers
INTRODUCTION: A healthy pregnancy depends on placental transfer from mother to fetus. Placental transfer takes place at the micro scale across the placental villi. Solutes from the maternal blood are taken up by placental villi and enter the fetal capillaries. This study investigated the effect of maternal blood flow on solute uptake at the micro scale. METHODS: A 3D image based modelling approach of the placental microstructures was undertaken. Solute transport in the intervillous space was modelled explicitly and solute uptake with respect to different maternal blood flow rates was estimated...
December 2017: Placenta
https://www.readbyqxmd.com/read/29197991/experimental-determination-of-folding-factor-of-benign-breast-cancer-cell-mcf10a-and-its-effect-on-contact-models-and-3d-manipulation-of-biological-particles
#17
M H Korayem, S Shahali, Z Rastegar
Plasma membrane of most cells is not smooth. The surfaces of both small and large micropermeable cells are folded and corrugated which makes mammalian cells to have a larger membrane surface than the supposed ideal mode, that is, the smooth sphere of the same volume. Since cancer is an anthropic disease, cancer cells tend to have a larger membrane area than normal cells. Therefore, cancer cells have higher folding factor and larger radius than normal and healthy cells. On the other hand, the prevalence of breast cancer has prompted researchers to improve the treatment options raised for the disease in the past...
December 2, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/29197858/image-based-3d-surface-approximation-of-the-bladder-using-structure-from-motion-for-enhanced-cystoscopy-based-on-phantom-data
#18
Quentin Péntek, Simon Hein, Arkadiusz Miernik, Alexander Reiterer
Bladder cancer is likely to recur after resection. For this reason, bladder cancer survivors often undergo follow-up cystoscopy for years after treatment to look for bladder cancer recurrence. 3D modeling of the bladder could provide more reliable cystoscopic documentation by giving an overall picture of the organ and tumor positions. However, 3D reconstruction of the urinary bladder based on endoscopic images is challenging. This is due to the small field of view of the endoscope, considerable image distortion, and occlusion by urea, blood or particles...
December 4, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29191526/clinical-application-of-an-open-source-3d-volume-rendering-software-to-neurosurgical-approaches
#19
Bruno Fernandes de Oliveira Santos, Marcos Devanir Silva da Costa, Ricardo Silva Centeno, Sergio Cavalheiro, Manoel Antônio de Paiva Neto, Michael T Lawton, Feres Chaddad-Neto
OBJECTIVE: Preoperative recognition of the anatomic individualities of each patient can help in achieving more precise and less invasive approaches. Moreover, this may help with anticipating potential complications and intraoperative difficulties. To describe the use, accuracy, and precision of a free tool for planning microsurgical approaches using three-dimensional reconstructions from magnetic resonance images. METHODS: We used the 3D Volume Rendering tool of an open source and free software program for three-dimensional reconstruction of images of surgical sites obtained by MRI volumetric acquisitions...
November 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29190364/development-of-the-mapme-intervention-body-image-scales-of-known-weight-status-for-4-5-and-10-11-year-old-children
#20
A R Jones, M J Tovée, L R Cutler, K N Parkinson, L J Ells, V Araujo-Soares, M S Pearce, K D Mann, D Scott, J M Harris, A J Adamson
Background: Parents tend to visually assess children to determine their weight status and typically underestimate child body size. A visual tool may aid parents to more accurately assess child weight status and so support strategies to reduce childhood overweight. Body image scales (BIS) are visual images of people ranging from underweight to overweight but none exist for children based on UK criteria. Our aim was to develop sex- and age-specific BIS for children, based on British growth reference (UK90) criteria...
November 28, 2017: Journal of Public Health
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