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https://www.readbyqxmd.com/read/29244247/2d-or-not-2d-testing-the-utility-of-2d-vs-3d-landmark-data-in-geometric-morphometrics-of-the-sculpin-subfamily-oligocottinae-pisces-cottoidea
#1
Thaddaeus J Buser, Brian L Sidlauskas, Adam P Summers
We contrast 2D vs. 3D landmark-based geometric morphometrics in the fish subfamily Oligocottinae by using 3D landmarks from CT-generated models and comparing the morphospace of the 3D landmarks to one based on 2D landmarks from images. The 2D and 3D shape variables capture common patterns across taxa, such that the pairwise Procrustes distances among taxa correspond and the trends captured by principal component analysis are similar in the xy plane. We use the two sets of landmarks to test several ecomorphological hypotheses from the literature...
December 15, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29243788/evaluation-on-the-impact-of-spontaneous-reperfusion-on-cardiac-muscle-of-acute-myocardial-infarction-by-three-dimensional-speckle-tracking-imaging
#2
Z-W Tao, X-W Ma, N-N Liu, N-L Tian, X-F Gao, P-X Xiao
OBJECTIVE: To explore the effect of spontaneous reperfusion (SR) on three-dimensional myocardial strain in patients with acute anterior myocardial infarction by three-dimensional speckle tracking imaging (3D-STI) technology. PATIENTS AND METHODS: Patients diagnosed with acute anterior myocardial infarction during 2013 to 2016 were consecutively selected and divided into SR group and non-spontaneous reperfusion (Non-SR) group based on whether there was SR. Patients in both groups received direct percutaneous coronary intervention (PCI) in time window...
December 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29243681/conservative-management-of-large-mandibular-dentigerous-cysts-with-a-novel-approach-for-follow-up-two-case-reports
#3
Ieva Gendviliene, Paul Legrand, Laura Ferreira Pinheiro Nicolielo, Deepti Sinha, Yannick Spaey, Constantinus Politis, Reinhilde Jacobs
BACKGROUND: Dentigerous cysts are odontogenic cysts of the jaws accounting for approximately 24% of all epithelium-lined jaw cysts. Rarely, these cysts can become extremely large causing additional symptoms, while challenging treatment. This article represents a novel approach for radiological treatment follow up of large dentigerous cysts. MATERIAL AND METHODS: Dentigerous cysts were treated by marsupialization, using dedicated obturators and enucleation of the cyst afterwards...
2017: Stomatologija
https://www.readbyqxmd.com/read/29243669/simultaneous-tumor-and-surrogate-motion-tracking-with-dynamic-mri-for-radiation-therapy-planning
#4
Seyoun Park, Rana Farah, Steven M Shea, Erik J Tryggestad, Russell Hales, Junghoon Lee
Respiration-induced tumor motion is a major obstacle for achieving high-precision radiotherapy of cancers in the thoracic and abdominal regions. Surrogate-based estimation and tracking methods are commonly used in radiotherapy, but with limited understanding of quantified correlation to tumor motion. In this study, we propose a method to simultaneously track the lung tumor and external surrogates to evaluate their spatial correlation in a quantitative way using dynamic MRI, which allows real-time acquisition without ionizing radiation exposure...
December 15, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29243002/comprehending-the-three-dimensional-mandibular-morphology-of-facial-asymmetry-patients-with-mandibular-prognathism
#5
Hideki Kamata, Norihisa Higashihori, Hiroki Fukuoka, Momotoshi Shiga, Tatsuo Kawamoto, Keiji Moriyama
BACKGROUND: The purpose of this study was to elucidate the factors that cause facial asymmetry by comparing the characteristics of the mandibular morphology in patients with mandibular prognathism with or without facial asymmetry using three-dimensional computed tomography (3D-CT). METHODS: We studied 28 mandibular prognathism patients whose menton deviated by ≥ 4 mm from the midline (FA group, n = 14) and those with a < 4-mm deviation (NA group, n = 14)...
December 15, 2017: Progress in Orthodontics
https://www.readbyqxmd.com/read/29242958/impact-of-radical-hysterectomy-on-the-transobturator-sling-pathway-a-retrospective-three-dimensional-magnetic-resonance-imaging-study
#6
Jinyang Chen, Chunlin Chen, Yige Li, Lan Chen, Juan Xu, Ping Liu
INTRODUCTION AND HYPOTHESIS: Morphological and functional anomalies of the urethra may cause stress urinary incontinence after radical hysterectomy (RH). We introduce a novel three-dimensional (3D) magnetic resonance imaging (MRI) technique to assess the impact of RH on the transobturator sling pathway. METHODS: 3D-MRI reconstruction models were retrospectively developed for the measurement of various parameters before and after RH, including puncture angle, orientation and distance from the midurethral puncture site to the obturator membrane (DUO), in 31 patients with cervical cancer...
December 14, 2017: International Urogynecology Journal
https://www.readbyqxmd.com/read/29241700/characterization-of-the-coating-and-tablet-core-roughness-by-means-of-3d-optical-coherence-tomography
#7
Daniel Markl, Patrick Wahl, Heinz Pichler, Stephan Sacher, Johannes G Khinast
This study demonstrates the use of optical coherence tomography (OCT) to simultaneously characterize the roughness of the tablet core and coating of pharmaceutical tablets. OCT is a high resolution non-destructive and contactless imaging methodology to characterize structural properties of solid dosage forms. Besides measuring the coating thickness, it also facilitates the analysis of the tablet core and coating roughness. An automated data evaluation algorithm extracts information about coating thickness, as well as tablet core and coating roughness...
December 11, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29241056/segmentation-of-arterial-walls-in-intravascular-ultrasound-cross-sectional-images-using-extremal-region-selection
#8
Mehdi Faraji, Irene Cheng, Iris Naudin, Anup Basu
Intravascular Ultrasound (IVUS) is an intra-operative imaging modality that facilitates observing and appraising the vessel wall structure of the human coronary arteries. Segmentation of arterial wall boundaries from the IVUS images is not only crucial for quantitative analysis of the vessel walls and plaque characteristics, but is also necessary for generating 3D reconstructed models of the artery. The aim of this study is twofold. Firstly, we investigate the feasibility of using a recently proposed region detector, namely Extremal Region of Extremum Level (EREL) to delineate the luminal and media-adventitia borders in IVUS frames acquired by 20 MHz probes...
December 6, 2017: Ultrasonics
https://www.readbyqxmd.com/read/29240796/improving-the-quality-of-child-anthropometry-manual-anthropometry-in-the-body-imaging-for-nutritional-assessment-study-bina
#9
Joel Conkle, Usha Ramakrishnan, Rafael Flores-Ayala, Parminder S Suchdev, Reynaldo Martorell
Anthropometric data collected in clinics and surveys are often inaccurate and unreliable due to measurement error. The Body Imaging for Nutritional Assessment Study (BINA) evaluated the ability of 3D imaging to correctly measure stature, head circumference (HC) and arm circumference (MUAC) for children under five years of age. This paper describes the protocol for and the quality of manual anthropometric measurements in BINA, a study conducted in 2016-17 in Atlanta, USA. Quality was evaluated by examining digit preference, biological plausibility of z-scores, z-score standard deviations, and reliability...
2017: PloS One
https://www.readbyqxmd.com/read/29240637/the-boomerang-lift-a-3-step-compartment-based-approach-to-the-youthful-cheek
#10
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/29240313/deconvolution-of-images-from-3d-printed-cells-in-layers-on-a-chip
#11
Sean Yu, Pranav Joshi, Yi Ju Park, Kyeong-Nam Yu, Moo-Yeal Lee
Layer-by-layer cell printing is useful in mimicking layered tissue structures inside the human body and has great potential for being a promising tool in the field of tissue engineering, regenerative medicine, and drug discovery. However, imaging human cells cultured in multiple hydrogel layers in 3D-printed tissue constructs is challenging as the cells are not in a single focal plane. Although confocal microscopy could be a potential solution for this issue, it compromises the throughput which is a key factor in rapidly screening drug efficacy and toxicity in pharmaceutical industries...
December 14, 2017: Biotechnology Progress
https://www.readbyqxmd.com/read/29240235/three-dimensional-digital-reconstruction-of-skin-epidermis-and-dermis
#12
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/29240212/accuracy-of-implants-placed-with-surgical-guides-thermoplastic-versus-3d-printed
#13
Caitlyn K Bell, Erik F Sahl, Yoon Jeong Kim, Dwight D Rice
This study was conducted to evaluate the accuracy of implants placed using two different guided implant surgery materials: thermoplastic versus three-dimensionally (3D) printed. A cone beam computed tomography (CBCT) scan previously obtained and selected for single-tooth implant replacement was converted into a Digital Imaging and Communications in Medicine (DICOM) file. All models were planned and exported for printing using BlueSkyBio Plan Software with the DICOM files. A total of 20 3D-printed mandibular quadrant jaws replicating the CBCT were printed by Right Choice Milling, as was the control model to accept the control implant...
January 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29238852/combined-in-depth-3d-en-face-imaging-of-the-optic-disc-optic-disc-pits-and-optic-disc-pit-maculopathy-using-swept-source-megahertz-oct-at-1050%C3%A2-nm
#14
Josef Maertz, Jan Philip Kolb, Thomas Klein, Kathrin J Mohler, Matthias Eibl, Wolfgang Wieser, Robert Huber, Siegfried Priglinger, Armin Wolf
PURPOSE: To demonstrate papillary imaging of eyes with optic disc pits (ODP) or optic disc pit associated maculopathy (ODP-M) with ultrahigh-speed swept-source optical coherence tomography (SS-OCT) at 1.68 million A-scans/s. To generate 3D-renderings of the papillary area with 3D volume-reconstructions of the ODP and highly resolved en face images from a single densely-sampled megahertz-OCT (MHz-OCT) dataset for investigation of ODP-characteristics. METHODS: A 1...
December 14, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29238826/a-re-engineered-software-interface-and-workflow-for-the-open-source-simvascular-cardiovascular-modeling-package
#15
Hongzhi Lan, Adam Updegrove, Nathan Wilson, Gabriel D Maher, Shawn C Shadden, Alison Marsden
Patient-specific simulation plays an important role in cardiovascular disease research, diagnosis, surgical planning and medical device design, as well as education in cardiovascular biomechanics. SimVascular is an open-source software package encompassing an entire cardiovascular modeling and simulation pipeline from image segmentation, 3D solid modeling, and mesh generation, to patient-specific simulation and analysis. SimVascular is widely used for cardiovascular basic science and clinical research as well as education, following increased adoption by users and development of a GATEWAY web portal to facilitate educational access...
December 13, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29238397/a-method-to-generate-the-surface-cell-layer-of-the-3d-virtual-shoot-apex-from-apical-initials
#16
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
#17
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/29237232/3d-printed-phantoms-mimicking-cortical-bone-for-the-assessment-of-ultrashort-echo-time-magnetic-resonance-imaging
#18
Robba Rai, David Manton, Michael G Jameson, Sonal Josan, Michael B Barton, Lois C Holloway, Gary P Liney
PURPOSE: Human cortical bone has a rapid T2 * decay, and it can be visualised using ultrashort echo time (UTE) techniques in magnetic resonance imaging (MRI). These sequences operate at the limits of gradient and transmit-receive signal performance. Development of multicompartment anthropomorphic phantoms that can mimic human cortical bone can assist with quality assurance and optimisation of UTE sequences. The aims of this study were to 1) characterise the MRI signal properties of a photopolymer resin that can be 3D printed, 2) develop multi-compartment phantoms based on the resin, and 3) demonstrate the feasibility of using these phantoms to mimic human anatomy in the assessment of UTE sequences...
December 13, 2017: Medical Physics
https://www.readbyqxmd.com/read/29236918/peri-implant-assessment-via-cone-beam-computed-tomography-and-digital-periapical-radiography-an-ex-vivo-study
#19
Nicolau Silveira-Neto, Mateus Ericson Flores, João Paulo De Carli, Max Dória Costa, Felipe de Souza Matos, Luiz Renato Paranhos, Maria Salete Sandini Linden
OBJECTIVES: This research evaluated detail registration in peri-implant bone using two different cone beam computer tomography systems and a digital periapical radiograph. METHODS: Three different image acquisition protocols were established for each cone beam computer tomography apparatus, and three clinical situations were simulated in an ex vivo fresh pig mandible: buccal bone defect, peri-implant bone defect, and bone contact. Data were subjected to two analyses: quantitative and qualitative...
November 2017: Clinics
https://www.readbyqxmd.com/read/29235648/anatomical-map-of-the-cranial-vasculature-and-sensory-ganglia
#20
Laura Taberner, Aitor Bañón, Berta Alsina
There is growing evidence of a direct influence of vasculature on the development of neurons in the brain. The development of the cranial vasculature has been well described in zebrafish but its anatomical relationship with the adjacent developing sensory ganglia has not been addressed. Here, by 3D imaging of fluorescently labelled blood vessels and sensory ganglia, we describe for the first time the spatial organization of the cranial vasculature in relation to the cranial ganglia during zebrafish development...
December 13, 2017: Journal of Anatomy
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