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3D surface imaging

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https://www.readbyqxmd.com/read/28729936/are-there-differences-in-brain-morphology-according-to-handedness
#1
Han Jang, Jae Youn Lee, Kang Il Lee, Kang Min Park
OBJECTIVE: This study aimed to investigate the differences in brain morphology according to handedness. MATERIALS AND METHODS: Forty-two healthy subjects were enrolled (21 right-handers and 21 nonright-handers). The two groups were classified according to the Edinburgh Handedness Inventory. Measures of cortical morphology, such as thickness, surface area, volume, and curvature, and the volumes of subcortical structures, such as the amygdala, caudate, hippocampus, globus pallidus, putamen, and thalamus, were compared between the groups according to handedness using whole-brain 3D T1-weighted MRI...
July 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28729748/on-flare-cme-characteristics-from-sun-to-earth-combining-remote-sensing-image-data-with-in-situ-measurements-supported-by-modeling
#2
Manuela Temmer, Julia K Thalmann, Karin Dissauer, Astrid M Veronig, Johannes Tschernitz, Jürgen Hinterreiter, Luciano Rodriguez
We analyze the well-observed flare and coronal mass ejection (CME) from 1 October 2011 (SOL2011-10-01T09:18) covering the complete chain of effects - from Sun to Earth - to better understand the dynamic evolution of the CME and its embedded magnetic field. We study in detail the solar surface and atmosphere associated with the flare and CME using the Solar Dynamics Observatory (SDO) and ground-based instruments. We also track the CME signature off-limb with combined extreme ultraviolet (EUV) and white-light data from the Solar Terrestrial Relations Observatory (STEREO)...
2017: Solar Physics
https://www.readbyqxmd.com/read/28729352/optical-imaging-of-surface-chemistry-and-dynamics-in-confinement
#3
Carlos Macias-Romero, Igor Nahalka, Halil I Okur, Sylvie Roke
We imaged the interfacial structure and dynamics of water in a microscopically confined geometry in three dimensions and on millisecond time scales with a 3D structurally illuminated wide-field second harmonic microscope. Image contrast reports on the orientational order of interfacial water, induced by charge-dipole interactions between water molecules and surface charges. The images were converted into surface potential maps. Spatially resolved surface acid dissociation constant pKa,s values were determined for the silica deprotonation reaction by following pH induced chemical changes on the curved and confined surfaces of a glass micro-capillary immersed in aqueous solutions...
July 20, 2017: Science
https://www.readbyqxmd.com/read/28727714/3d-morphometric-analysis-of-normal-sacroiliac-joints-a-new-classification-of-surface-shape-variation-and-the-potential-implications-in-pain-syndromes
#4
Mary Kristen Jesse, Christopher Kleck, Adam Williams, Brian Petersen, Deborah Glueck, Kimberly Lind, Vikas Patel
BACKGROUND: Normal sacroiliac (SI) joints vary widely in shape, and it is unclear whether SI joint morphology plays a role in the development of pain. To answer this question, we used 3D-CT surface rendering to image healthy study participants and used the resulting images to develop a classification system for SI joint morphology. In a case-control study comparing health research participants to patients with SI pain, we assessed whether the classification of SI joint morphology was associated with pain...
July 2017: Pain Physician
https://www.readbyqxmd.com/read/28727417/oxygen-dependent-lipid-profiles-of-3d-cultured-human-chondrocytes-revealed-by-maldi-msi
#5
Brenda Bakker, Gert B Eijkel, Ron M A Heeren, Marcel Karperien, Janine N Post, Berta Cillero Pastor
Articular cartilage is exposed to a gradient of oxygen levels ranging from 5% at the surface to 1% in the deepest layers. While most cartilage research is performed in supraphysiological oxygen levels (19-21%), culturing chondrocytes under hypoxic oxygen levels (≤ 8%) promotes the chondrogenic phenotype. Exposure of cells to various oxygen levels alters their lipid metabolism, but detailed studies examining how hypoxia affects lipid metabolism in chondrocytes are lacking. To better understand the chondrocyte's behavior in response to oxygen we cultured 3D pellets of human primary chondrocytes in normoxia (20% oxygen) and hypoxia (2...
July 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28722134/location-variations-and-predictors-of-epicardial-fat-mapping-using-multi-detector-computed-tomography-to-assist-epicardial-ventricular-tachycardia-ablation
#6
Mariaileen Sourwine, Jean Jeudy, Brian Miller, Rama Vunnam, Hasan Imanli, Olurotimi Mesubi, Martine Etienne-Mesubi, Vincent See, Stephen Shorofsky, Timm Dickfeld
BACKGROUND: A significant number of ventricular tachycardia circuits are located close to the epicardial surface and are amendable to epicardial ablation. Epicardial fat often interferes with substrate mapping and ablation, though little is known regarding the distribution of fat and its fluctuation with the cardiac cycle. METHODS: We studied 40 patients who underwent a 64-slice MDCT in order to describe patterns of epicardial fat distribution, variation during cardiac cycle and clinical predictors of epicardial fat...
July 19, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28718001/a-new-device-for-fiducial-registration-of-image-guided-navigation-system-for-liver-rfa
#7
Nobutaka Doba, Hiroyuki Fukuda, Kazushi Numata, Yoshiteru Hao, Kouji Hara, Akito Nozaki, Masaaki Kondo, Makoto Chuma, Katsuaki Tanaka, Shigeo Takebayashi, Norihiro Koizumi, Akira Kobayashi, Junichi Tokuda, Shin Maeda
PURPOSE: Radiofrequency ablation for liver tumors (liver RFA) is widely performed under ultrasound guidance. However, discriminating between the tumor and the needle is often difficult because of cavitation caused by RFA-induced coagulation. An unclear ultrasound image can lead to complications and tumor residue. Therefore, image-guided navigation systems based on fiducial registration have been developed. Fiducial points are usually set on a patient's skin. But the use of internal fiducial points can improve the accuracy of navigation...
July 17, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28716447/elevated-wall-shear-stress-in-aortic-type-b-dissection-may-relate-to-retrograde-aortic-type-a-dissection-a-computational-fluid-dynamics-pilot-study
#8
A Osswald, C Karmonik, J R Anderson, F Rengier, M Karck, J Engelke, K Kallenbach, D Kotelis, S Partovi, D Böckler, A Ruhparwar
OBJECTIVE: Retrograde aortic type A dissection (RTAD) is a known complication in patients with aortic type B dissection. The purpose of this computational fluid dynamics (CFD) study was to identify haemodynamic risk factors for the occurrence of RTAD. METHODS: Computed tomographic angiography (CTA) images of 10 patients with type B dissections, who subsequently developed a RTAD, were retrospectively analysed together with patients constituting a control group (n = 10) where no further vascular events after the initial type B dissection occurred...
July 14, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28715372/high-resolution-episcopic-microscopy-hrem-simple-and-robust-protocols-for-processing-and-visualizing-organic-materials
#9
Stefan H Geyer, Barbara Maurer-Gesek, Lukas F Reissig, Wolfgang J Weninger
We provide simple protocols for generating digital volume data with the high-resolution episcopic microscopy (HREM) method. HREM is capable of imaging organic materials with volumes up to 5 x 5 x 7 mm(3) in typical numeric resolutions between 1 x 1 x 1 and 5 x 5 x 5 µm(3). Specimens are embedded in methacrylate resin and sectioned on a microtome. After each section an image of the block surface is captured with a digital video camera that sits on the phototube connected to the compound microscope head. The optical axis passes through a green fluorescent protein (GFP) filter cube and is aligned with a position, at which the bock holder arm comes to rest after each section...
July 7, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28715090/learning-based-automated-segmentation-of-the-carotid-artery-vessel-wall-in-dual-sequence-mri-using-subdivision-surface-fitting
#10
Shan Gao, Ronald Van't Klooster, Pieter H Kitslaar, Bram F Coolen, Alexandra M van den Berg, Loek P Smits, Rahil Shahzad, Denis P Shamonin, Patrick J H de Koning, Aart J Nederveen, Rob J van der Geest
PURPOSE: The quantification of vessel wall morphology and plaque burden requires vessel segmentation, which is generally performed by manual delineations. The purpose of our work is to develop and evaluate a new 3D model-based approach for carotid artery wall segmentation from dual-sequence MRI. METHODS: The proposed method segments the lumen and outer wall surfaces including the bifurcation region by fitting a subdivision surface constructed hierarchical-tree model to the image data...
July 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28714897/development-of-three-dimensional-dental-scanning-apparatus-using-structured-illumination
#11
Jae Sung Ahn, Anjin Park, Ju Wan Kim, Byeong Ha Lee, Joo Beom Eom
We demonstrated a three-dimensional (3D) dental scanning apparatus based on structured illumination. A liquid lens was used for tuning focus and a piezomotor stage was used for the shift of structured light. A simple algorithm, which detects intensity modulation, was used to perform optical sectioning with structured illumination. We reconstructed a 3D point cloud, which represents the 3D coordinates of the digitized surface of a dental gypsum cast by piling up sectioned images. We performed 3D registration of an individual 3D point cloud, which includes alignment and merging the 3D point clouds to exhibit a 3D model of the dental cast...
July 15, 2017: Sensors
https://www.readbyqxmd.com/read/28713690/three-dimensional-stereotactic-surface-projection-in-the-statistical-analysis-of-single-photon-emission-computed-tomography-data-for-distinguishing-between-alzheimer-s-disease-and-depression
#12
Eiji Kirino
AIM: To evaluate usefulness of single photon emission computed tomography (SPECT) with three-dimensional stereotactic surface projection (3D-SSP) in distinguishing between Alzheimer's disease (AD) and depression. METHODS: We studied 43 patients who presented with both depressive symptoms and memory disturbance. Each subject was evaluated using the following: (1) the Minimal Mental State Examination; (2) the Hamilton Rating Scale for Depression; (3) Clinical Global Impression-Severity scale (CGI-S); and (4) SPECT imaging with 3D-SSP...
June 22, 2017: World Journal of Psychiatry
https://www.readbyqxmd.com/read/28713051/3d-visualization-and-pathological-characteristics-of-cartilage-and-subchondral-bone-changes-in-the-lumbar-facet-joint-of-an-ovariectomized-mouse-model
#13
Yong Cao, Shuangfei Ni, Tianding Wu, Chunyue Duan, Shenghui Liao, Jianzhong Hu
BACKGROUD CONTEXT: Low back pain (LBP) is more prevalent among postmenopausal women than men. Ovariectomy (OVX) is an established animal model that mimics the estrogen deficiency of postmenopausal women. Little is known about the morphological properties of cartilage and subchondral bone changes in the lumbar facet joint (LFJ) of an OVX mouse model. PURPOSE: The purpose of this study is to characterize the morphological change of cartilage and subchondral bone in LFJ of an OVX mouse model...
July 13, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28700598/tracing-social-interactions-in-pleistocene-north-america-via-3d-model-analysis-of-stone-tool-asymmetry
#14
Sabrina B Sholts, Joseph A M Gingerich, Stefan Schlager, Dennis J Stanford, Sebastian K T S Wärmländer
Stone tools, often the sole remnant of prehistoric hunter-gatherer behavior, are frequently used as evidence of ancient human mobility, resource use, and environmental adaptation. In North America, studies of morphological variation in projectile points have provided important insights into migration and interactions of human groups as early as 12-13 kya. Using new approaches to 3D imaging and morphometric analysis, we here quantify bifacial asymmetry among early North American projectile point styles to better understand changes in knapping technique and cultural transmission...
2017: PloS One
https://www.readbyqxmd.com/read/28698623/targeted-feature-recognition-using-mechanical-spatial-filtering-with-a-low-cost-compliant-strain-sensor
#15
Eli M Barnett, Julian J Lofton, Miao Yu, Hugh A Bruck, Elisabeth Smela
A tactile sensing architecture is presented for detection of surface features that have a particular target size, and the concept is demonstrated with a braille pattern. The approach is akin to an inverse of mechanical profilometry. The sensing structure is constructed by suspending a stretchable strain-sensing membrane over a cavity. The structure is moved over the surface, and a signal is generated through mechanical spatial filtering if a feature is small enough to penetrate into the cavity. This simple design is tailorable and can be realized by standard machining or 3D printing...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28694041/real-time-three-dimensional-3d-visualization-of-fusion-image-for-accurate-subdural-electrodes-placement-of-epilepsy-surgery
#16
Ayataka Fujimoto, Tohru Okanishi, Sotaro Kanai, Keishiro Sato, Mitsuyo Nishimura, Hideo Enoki
INTRODUCTION: The perfect match between pre-surgical estimated seizure onset zone and subdural electrodes (SEs) position is requested for epilepsy surgery. However, post-surgical neuro images sometimes disappoint physicians due to SEs malposition. To place SEs, we used to use intraoperative photograph and fluoroscopy. With this procedure, we just recognized approximate location of SEs during surgery. The purpose of the study is to perform precise SEs location intraoperatively using intra operative computer tomography (CT) and image-guidance...
July 7, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28692518/costal-cartilage-assessment-in-surgical-timing-of-microtia-reconstruction
#17
Zhongyang Sun, Xiaobo Yu, Weiwei Chen, Qinghua Yang, Yupeng Song, Jiayu Zhou, Haiyue Jiang
BACKGROUND: Rib cartilage growth is closely related to age and determines the feasibility and outcomes of auricular reconstruction. Ear reconstruction is performed as early as age 6 in efforts to treat children before school matriculation while allowing for sufficient rib growth. But there is controversy over the optimal timing of microtia reconstruction. This study employs CT imaging and surface scanning to guide the timing of auricular reconstruction in children. METHODS: A retrospective analysis was performed on 6-year-old microtia patients between January 2016 and June 2016...
July 7, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28691233/the-bias-of-a-two-dimensional-view-comparing-two-dimensional-and-three-dimensional-mesophyll-surface-area-estimates-using-noninvasive-imaging
#18
Guillaume Théroux-Rancourt, J Mason Earles, Matthew E Gilbert, Maciej A Zwieniecki, C Kevin Boyce, Andrew J McElrone, Craig R Brodersen
The mesophyll surface area exposed to intercellular air space per leaf area (Sm ) is closely associated with CO2 diffusion and photosynthetic rates. Sm is typically estimated from two-dimensional (2D) leaf sections and corrected for the three-dimensional (3D) geometry of mesophyll cells, leading to potential differences between the estimated and actual cell surface area. Here, we examined how 2D methods used for estimating Sm compare with 3D values obtained from high-resolution X-ray microcomputed tomography (microCT) for 23 plant species, with broad phylogenetic and anatomical coverage...
July 10, 2017: New Phytologist
https://www.readbyqxmd.com/read/28689366/micro-ct-and-fe-sem-enamel-analyses-of-calcium-based-agent-application-after-bleaching
#19
Mauricio Neves Gomes, Flávia Pires Rodrigues, Nick Silikas, Carlos Eduardo Francci
OBJECTIVES: The objective of the present study is to evaluate the effects of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) on bleached enamel. MATERIALS AND METHODS: A bleaching agent (35% hydrogen peroxide) was applied, 4 × 8 min on premolar teeth (n = 8). A CPP-ACP paste was applied for 7 days. Prior and post-treatment, microtomography images were obtained and 3D regions of interest (ROIs) were selected, from outer enamel, extending to 110...
July 8, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28688537/calculated-ventilation-and-effort-distribution-as-a-measure-of-respiratory-disease-and-heliox-effectiveness
#20
N Pozin, S Montesantos, I Katz, M Pichelin, C Grandmont, I Vignon-Clementel
In spite of numerous clinical studies, there is no consensus on the benefit Heliox mixtures can bring to asthmatic patients in terms of work of breathing and ventilation distribution. In this article we use a 3D finite element mathematical model of the lung to study the impact of asthma on effort and ventilation distribution along with the effect of Heliox compared to air. Lung surface displacement fields extracted from computed tomography medical images are used to prescribe realistic boundary conditions to the model...
June 23, 2017: Journal of Biomechanics
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