J Legrand, Seppe Terryn, Ellen Roels, Bram Vanderborght,
Voxel-based robots are aggregations of soft and simple building blocks that have been extensively evolved and ... like walking, jumping or swimming. However, real-life voxel-based robots are rather scarce because of their ... methods, the interfaces between the soft multi-material voxels are prone to failure. This work proposes to make voxels out of reversible Diels-Alder polymers, which are ... chemical connections, while allowing for reconfiguration. A first voxel-based gripper is thus robustly assembled, then disassembled, ...
Tópico(s): Micro and Nano Robotics
2023 - Institute of Electrical and Electronics Engineers | IEEE Robotics and Automation Letters
Shu-Han Zang, Ying‐Yeh Chen, Haonan Chen, Huawei Shi, Li Zhou,
... fluctuations in the left superior frontal gyrus (1352 voxels, p = 0.0028), right angular gyrus (14 voxels, p = 0.0457), and cerebellum (12 voxels, p = 0.0446). Acupuncture improved the function of right superior frontal gyrus (1, 404 voxels, p = 0.0123), left inferior frontal gyrus (1068 voxels, p = 0.0088), left inferior temporal gyrus (903 voxels, p = 0.0074), left supramarginal gyrus (888 voxels, p = 0.0113), left precuneus (457 voxels, p = 0.0247), right precuneus (302 voxels, p = 0.0191), left supplementary motor area (82 ...
Tópico(s): Advanced Neuroimaging Techniques and Applications
2023 - Frontiers Media | Frontiers in Neurology
Gilles Decroly, Adam Chafaï, Guillaume de Timàry, Gabriele Gandolfo, Alain Delchambre, Pierre Lambert,
... configuration changes. To this end, herein, a modular voxel‐based methodology adaptable to any scale and with ... N ‐isopropylacrylamide) hydrogel is developed to print the voxels. Bending, compression, and twisting voxels are designed, printed, and characterized. A voxel consists of an isotropically shrinking active material reinforced adequately with a passive pattern. Each elementary voxel deforms along one degree of freedom and is ... a side length of 40 μm, the bending voxel achieves a bending angle of 25º or curvature ...
Tópico(s): Micro and Nano Robotics
2023 - Wiley | Advanced Intelligent Systems
Le Dong, Jinqiang Wang, Dong Wang,
3D voxel printing has emerged as a promising technology for fabricating sophisticated structures with voxel-level material distributions, allowing for a wide design ... of theoretical models and design strategies for 3D voxel printed structures are hindered due to the complex geometries and voxel-level material distributions. In this work, we propose a design framework for 3D voxel printed lattice metamaterials by combining theoretical models, finite ... and propose a python-assisted FEM for the voxel lattice metamaterials with curled microstructures and arbitrary material ...
Tópico(s): 3D Printing in Biomedical Research
2023 - Elsevier BV | Additive manufacturing
Sean Rothenberger, Jiacheng Zhang, Melissa C. Brindise, Susanne Schnell, Michael Markl, Pavlos P. Vlachos, Vitaliy L. Rayz,
... as the difference between the expectation of the voxel's measured velocity and actual velocity at the voxel center. The model accounts for bias error introduced by the intra-voxel velocity distribution and partial volume (PV) effects. We assess the intra-voxel velocity distribution using a 3D Taylor Series expansion. ... valid for measurements with at least 3.75 voxels across the vessel diameter and signal-to-noise ... 5. All test cases exceeded this diameter to voxel size ratio with diameters, isotropic voxel sizes, and ...
Tópico(s): Cardiovascular Function and Risk Factors
2022 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Medical Imaging
Chang Liu, Kim Calders, Félicien Meunier, Jean‐Philippe Gastellu‐Etchegorry, Joanne Nightingale, Mathias Disney, Niall Origo, William Woodgate, Hans Verbeeck,
... highly detailed 3D stand representations: 3D‐explicit and voxel‐based. The discrete anisotropic radiative transfer (DART) model ... used for RT simulations. The 3D‐explicit and voxel‐based 3D forest scenes were used as structural ... the benchmark, the accuracy and efficiency of the voxel‐based RT simulation were evaluated under multiple simulation conditions. The results showed that for voxel‐based RT simulations: with voxel sizes 0.1, 1, and 10 m and ... 5% tolerance limit in 89% viewing directions; with voxel sizes 0.2, 1, and 10 m, the ...
Tópico(s): Plant Water Relations and Carbon Dynamics
2022 - Wiley | Journal of Geophysical Research Atmospheres
Lin Zhao, Siyuan Xu, Liman Liu, Delie Ming, Wenbing Tao,
... LiDAR-based 3D point cloud semantic segmentation, most voxel-based 3D segmentors cannot efficiently capture large amounts ... their performance. To address this problem, a sparse voxel-based attention network is introduced for 3D LiDAR ... which captures large amounts of context information between voxels through sparse voxel-based multi-head attention (SMHA). The traditional multi- ... directly be applied to the non-empty sparse voxels. To this end, a hash table is built according to the incrementation of voxel coordinates to lookup the non-empty neighboring voxels ...
Tópico(s): Robotics and Sensor-Based Localization
2022 - Multidisciplinary Digital Publishing Institute | Remote Sensing
E.A. Zwanenburg, Mark A. Williams, Jason M. Warnett,
... complied with its own MPE statement, however sub voxel accuracies were found. The maximum error in terms of voxels ranged between 0.16 voxel to 0.43 voxel for low magnification (voxel size of 100 μm) and 0.49 voxel to 0.82 voxel for high magnification (voxel size of 14 μm) between systems. This indicates ... to the extreme range of measurement volumes and voxel sizes/resolutions XCT are capable of, it is ... maybe reasonable to consider an MPE dependent on voxel size.
Tópico(s): Radiation Dose and Imaging
2022 - Elsevier BV | Precision Engineering
Patrick Geeraert, Fatemehsadat Jamalidinan, Fiona Burns, Kelly Jarvis, Michael Bristow, Carmen Lydell, Silvia S. Hidalgo Tobón, Benito de Celis Alonso, Paul W.M. Fedak, James A. White, Julio García,
... aims to explore novel 4D-flow MRI parametric voxel-by-voxel forward flow, reverse flow, kinetic energy and stasis in BAV disease. We hypothesize that novel parametric voxel-by-voxel markers will be associated with aortic dilation and ... flow (RF), and stasis were measured on a voxel-by-voxel basis. T-tests (or non-parametric equivalent) compared ... multivariate analyses explored associations between diameter and parametric voxel-by-voxel parameters. Results: Compared to controls, BAV patients showed ...
Tópico(s): Aortic aneurysm repair treatments
2022 - Frontiers Media | Frontiers in Bioengineering and Biotechnology
Yusheng Xu, Xiaohua Tong, Uwe Stilla,
... points into a higher-level representation, such as voxels. Using voxels to represent discrete points is a common and ... way to organize and structure 3D point clouds. Voxels, similar to pixels in an image, are abstracted ... been very few reviews summarizing and discussing the voxel-based representation of 3D point clouds in urban ... state-of-the-art methods and applications of voxel-based point cloud representations from a collection of ... we focus on the creation and utilization of voxels, as well as the strengths and weaknesses of ...
Tópico(s): 3D Shape Modeling and Analysis
2021 - Elsevier BV | Automation in Construction
Maggie Mae Mell, Ghislain St-Yves, Thomas Naselaris,
... amount of variance in the activity of most voxels in all visual areas. This failure could reflect ... the source of unexplained variance was shared across voxels, individual brains, retinotopic locations, and hierarchically distant visual brain areas. We answered these questions using voxel-to-voxel (vox2vox) models that predict activity in a target voxel given activity in a population of source voxels. We found that simple linear vox2vox models increased ... DCNN-based encoding models when source and target voxels came from different brains, demonstrating that the source ...
Tópico(s): Face Recognition and Perception
2021 - Elsevier BV | NeuroImage
Jiajun Deng, Shaoshuai Shi, Peiwei Li, Wengang Zhou, Yanyong Zhang, Houqiang Li,
... how the 3D data are represented, i.e., voxel-based or point-based representation. Many existing high ... overheads due to unordered storage. In contrast, the voxel-based structure is better suited for feature extraction ... performance 3D object detection and that the coarse voxel granularity can also offer sufficient detection accuracy. Bearing ... in mind, we devise a simple but effective voxel-based framework, named Voxel R-CNN. By taking full advantage of voxel features in a two-stage approach, our method ...
Tópico(s): 3D Surveying and Cultural Heritage
2021 - Association for the Advancement of Artificial Intelligence | Proceedings of the AAAI Conference on Artificial Intelligence
Furkan I. Ulu, Ravi Tomar, Ram Mohan,
... allows printing complex multi-material composite configurations using Voxel digital designs' capability, thus allowing rapid prototyping of ... hard materials with different distributions and sizes via voxel digital print design. Design/methodology/approach Voxels are extruded representations of pixels and represent different ... of a digitally designed part represented by a voxel can be printed with a different material. Multi- ... were rapidly prototyped via PolyJet printing through developed Voxel digital printing designs. The tensile behavior of these ...
Tópico(s): Interactive and Immersive Displays
2021 - Emerald Publishing Limited | Rapid Prototyping Journal
Jiwoon Yeom, Yeseul Son, Kwang‐Soon Choi,
The representation of three-dimensional volumetric pixels, voxels, is an important issue for the near-to-eye displays (NEDs) to solve the vergence-accommodation conflict problem. Although the holographic waveguides using ... of holographic waveguides, particularly to represent the arbitrary voxels and investigate the voxel duplication problem arising from the non-collimated light from the voxels. In order to prevent the image crosstalk arising from the voxel duplication, we propose an adjustment method for the ...
Tópico(s): Liquid Crystal Research Advancements
2021 - Multidisciplinary Digital Publishing Institute | Photonics
Hannah Weiser, Lukas Winiwarter, Katharina Anders, Fabian Ewald Fassnacht, Bernhard Höfle,
... in a forest. Specifically, we examine how different voxel sizes used to create a virtual forest affect ... detail in the voxelisation is dependent on the voxel size, which influences the number of voxel cells of the model. A smaller voxel size (i.e., more voxels) increases the computational cost of laser scanning simulations ... object representation. We present a method that decouples voxel grid resolution from final voxel cube size by scaling voxels to smaller cubes, whose surface area is proportional ...
Tópico(s): Forest Ecology and Biodiversity Studies
2021 - Elsevier BV | Remote Sensing of Environment
Nirza Mukhia, Praveen Birur, A. R. Shubhasini, G. Shubha, Keerthi Gurushanth,
... with 0.2-mm and 0.4-mm voxel sizes with the reference standard model and compare ... was scanned with CBCT 10 times at each voxel size. The models created from the CBCT data ... for 0.2-mm and 0.4-mm voxel scans were 0.4342 mm and 0.4580 ... both 0.2-mm and 0.4-mm voxels produced good measurement reliability and did not significantly ... with 0.2-mm and 0.4-mm voxel sizes delivered similarly accurate models. Larger voxels can be used to minimize radiation exposure. To ... with 0.2-mm and 0.4-mm voxel sizes with the reference standard model and compare ...
Tópico(s): Medical Imaging Techniques and Applications
2021 - Elsevier BV | Oral Surgery Oral Medicine Oral Pathology and Oral Radiology
Silke Proesmans, Robrecht Raedt, Charlotte Germonpré, Emma Christiaen, Benedicte Descamps, Paul Boon, Veerle De Herdt, Christian Vanhove,
... this study we present a framework for statistical voxel-based analysis of glucose uptake in the rat ... of 28 normal rat brains were coregistered and voxel-wisely averaged. Ratio images were generated by voxel-wisely dividing each of these images with the ... as normalization factor. The normalized PET images were voxel-wisely averaged to generate a normal rat brain atlas. The variability of voxel intensities across the normalized PET images was compared ... and the PET images of these animals were voxel-wisely compared to the normal atlas by group- ...
Tópico(s): Glioma Diagnosis and Treatment
2021 - Frontiers Media | Frontiers in Medicine
Produção Nacional
Revisado por pares
Amanda Pelegrin Candemil, Benjamin Salmon, Gláucia María Bovi Ambrosano, Deborah Queiroz Freitas, Francisco Haiter‐Neto, Matheus Lima Oliveira,
... this study was to evaluate the influence of voxel size on artifacts arising from the exomass in ... using 2 CBCT units, each adjusted to 2 voxel sizes: 0.2 and 0.3 mm. From ... exomass and additional CBCT scans were acquired. Mean voxel gray values were obtained from 16 homogeneous areas ... and the standard deviation was calculated to obtain voxel gray value variability. The data were analyzed using ... and Dunnett tests (α =.05). Results Overall, mean voxel gray values and voxel gray value variability did not differ significantly between ...
Tópico(s): Radiation Dose and Imaging
2021 - Elsevier BV | Oral Surgery Oral Medicine Oral Pathology and Oral Radiology
Maxime Soma, François Pimont, Jean‐Luc Dupuy,
... retrieving the foliage area at stand, plant or voxel scales. Several sources of measurement errors have been ... measurements remain sensitive to several factors, including, 1) voxel size and vegetation structure within voxels, 2) heterogeneity in sampling from TLS instrument (occlusion ... biases were formerly attributed to (i) the unsampled voxels and to (ii) the subgrid vegetation heterogeneity (i. ... the simulation experiment providing known LAD references at voxel scale, vegetation manipulations and unbiased point estimators. We ...
Tópico(s): Forest ecology and management
2021 - Elsevier BV | Remote Sensing of Environment
Muhamed Baraković, Chantal M. W. Tax, Umesh Rudrapatna, Maxime Chamberland, Jonathan Rafael‐Patiño, Cristina Granziera, Jean‐Philippe Thiran, Alessandro Daducci, Erick J. Canales‐Rodríguez, Derek K. Jones,
... in the human brain, approximately 60–90% of voxels contain multiple fiber populations. Quantifying microstructural properties of distinct fiber populations within a voxel is therefore challenging but necessary. While progress has ... and T1-relaxation properties, how to resolve intra-voxel T2 heterogeneity remains an open question. Here a ... estimate multiple intra-axonal T2 values within a voxel. Unlike previously-proposed voxel-based T2 estimation methods, which (when applied in ... implicitly assume just one fiber bundle in the voxel or the same T2 for all bundles in ...
Tópico(s): Bone and Joint Diseases
2020 - Elsevier BV | NeuroImage
Е. Ф. Мартынович, E.O. Chernova, V.P. Dresvyansky, A. É. Bugrov, P V Kostryukov, A. V. Konyashchenko,
... of creating three different types of spatially selective voxels by laser radiation in the volume of an ... optical medium was solved. Each of the created voxels provides one base color: red, green, or blue. Red and green voxels are microvolumes inside a crystal in which femtosecond ... when illuminated with blue radiation that excites luminescence. Voxels responsible for the blue glow are microvolumes in ... scattering centers are created by femtosecond pulses. These voxels do not contain any luminescence centers; they scatter ...
Tópico(s): Nonlinear Optical Materials Studies
2020 - Elsevier BV | Optics & Laser Technology
Cheng Wang, Shezhou Luo, Xiaohuan Xi, Sheng Nie, Dan Ma, Youju Huang,
... This research mainly focused on the influence of voxel size on forest canopy height estimates. Methods A range of voxel sizes (from 10.0 m to 40.0 ... estimation accuracies of forest canopy height with different voxel sizes. In this study, all the waveforms within a voxel size were aggregated into a voxel-based LiDAR waveform, and a range of waveform metrics were calculated using the voxel-based LiDAR waveforms. Then, we established estimation model of forest canopy height using the voxel-based waveform metrics through Random Forest (RF) regression ...
Tópico(s): Remote Sensing in Agriculture
2020 - Springer Science+Business Media | Forest Ecosystems
Angel Torrado‐Carvajal, Daniel Albrecht, Jeungchan Lee, Ovidiu C. Andronesi, Eva‐Maria Ratai, Vitaly Napadow, Marco L. Loggia,
... and/or signal-to-noise ratio) in multi-voxel MRI spectroscopy, or chemical shift imaging (CSI) can result in the significant loss of usable voxels. A potential solution to minimize this problem is to estimate the value of unusable voxels by utilizing information from reliable voxels in the same image. We assessed an image ... called inpainting as a tool to restore unusable voxels, and compared it with traditional interpolation methods (nearest ... of less than 5% even with 50% missing voxels, whereas the other techniques demonstrated up to three ...
Tópico(s): Functional Brain Connectivity Studies
2020 - Springer Science+Business Media | Annals of Biomedical Engineering
Maxime Soma, François Pimont, Denis Allard, Richard Fournier, Jean‐Luc Dupuy,
... i.e. point cloud, can be divided into voxels to estimate the three-dimensional distribution of LAD/ ... the reliability of some local estimates, since several voxels are either not explored or poorly-explored by ... vary regarding the minimum number of beams crossing voxels or the minimum path lengths required to provide ... a value to non-explored and poorly-explored voxels is still an open question. The present work ... LAD estimates in non-explored and poorly-explored voxels. The method takes advantage of i) an unbiased ...
Tópico(s): Remote Sensing in Agriculture
2020 - Elsevier BV | Remote Sensing of Environment
M.A. Thomas, Armeen Mahvash, Mohamed E. Abdelsalam, Ahmed O. Kaseb, S. Cheenu Kappadath,
... Tc‐MAA and PM. Methods Both PM and voxel dosimetry models were used to calculate tumor and ... by (a) 99m Tc‐MAA for 90 Y voxel dosimetry and (b) 99m Tc‐MAA PM for voxel dosimetry, separately for both tumors and NL. Bland‐ ... in the 99m Tc‐MAA vs 90 Y voxel dosimetry comparison, while all cases were used to compare dosimetry models (PM vs voxel). Results Half (16/32) of cases were deemed ... PI) of −1% (±31%). PM was equivalent to voxel dosimetry for NL doses with mean bias (PI) ... 99m Tc‐MAA planning for 90 Y tumor voxel doses was poor, overestimating dose by an average ...
Tópico(s): Advanced Radiotherapy Techniques
2020 - Wiley | Medical Physics
Martijn J. Mulder, Max C. Keuken, Pierre‐Louis Bazin, Anneke Alkemade, Birte U. Forstmann,
... what extent do size and shape of a voxel measured with magnetic resonance imaging (MRI) affect the ... visualize small brain nuclei? Despite general consensus that voxel geometry affects volumetric properties of regions of interest, ... nuclei, no quantitative data on the influence of voxel size and shape on labeling accuracy is available. Using simulations, we investigated the selective influence of voxel geometry by reconstructing simulated ellipsoid structures with voxels varying in shape and size. For each reconstructed ...
Tópico(s): Morphological variations and asymmetry
2019 - Public Library of Science | PLoS ONE
Zhenguo Nie, Roby Lynn, Tommy Tucker, Thomas R. Kurfess,
... amount of machining time spent doing useful work. Voxel-based computer-aided manufacturing (CAM) software enables simple computation of MRR by counting the number of voxels removed (N) in one feed step. However, depending ... the geometry of the cutting tool and the voxel size used in the CAM software, there can ... simulated MRR values. The cause of oscillation in voxel-based simulated MRR is the misjudgment of voxel removal due to the discrete nature of the voxel model. MRR has a linear relationship with N, ...
Tópico(s): Advanced machining processes and optimization
2019 - Elsevier BV | CIRP journal of manufacturing science and technology
Xiaolong Guo, G Li, Jianmao Zheng, Radhika Krishna O.H., F C Liu, Fengjie Yuan, Peijun Lyu, Yidan Guo, Shuhui Yin,
To investigate simultaneously the effect of voxel size and fracture width on the accuracy of detecting vertical root fractures (VRFs) in non-root filled teeth when using cone beam ... were scanned with four CBCT units at different voxel sizes provided by the units. Three observers classified ... the ROC curve (AUC) were calculated. AUCs amongst voxel sizes and between the fracture widths were compared ... CBCT unit, no significant differences were found amongst voxel sizes for the AUCs, irrespective of the fracture ...
Tópico(s): Advanced X-ray and CT Imaging
2019 - Wiley | International Endodontic Journal
Anna I. Blazejewska, Bruce Fischl, Lawrence L. Wald, Jon̈athan R. Polimeni,
... has made functional MRI (fMRI) with small isotropic voxel sizes down to 1 mm and below more ... regional patterns of cortical activation for which conventional voxel sizes of 3 mm and larger provide sufficient spatial resolution, smaller voxels can help avoid contamination from adjacent white matter ( ... resolution acquisitions, which offsets the benefits of small voxels. Here we introduce a framework that combines small, isotropic fMRI voxels acquired at 7 T field strength with a ... higher detection power and higher resolution than conventional voxel sizes. Our smoothing approach uses a family of ...
Tópico(s): Functional Brain Connectivity Studies
2019 - Elsevier BV | NeuroImage
Di Yan, Shupeng Chen, Daniel Krauss, Peter Y. Chen, Prakash Chinnaiyan, George D. Wilson,
PurposeTo construct a tumor voxel dose response matrix (DRM) and dose prescription function (DPF) for adaptive dose painting by number (DPbN) based on treatment feedback ... weekly and posttreatment PET/CT images were registered voxel-to-voxel to the corresponding pretreatment baseline PET/CT image. Tumor voxel DRM was created using serial FDG-PET imaging ... the baseline standardized uptake value (SUV0). A tumor voxel control probability (TVCP) lookup table was created using the maximum likelihood estimation on the tumor voxel (SUV0, DRM) domain of all tumors. Tumor voxel ...
Tópico(s): Radiomics and Machine Learning in Medical Imaging
2019 - Elsevier BV | International Journal of Radiation Oncology*Biology*Physics