Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 125 for “"voxels"”.
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Determining the partial volumes of brain tissue from spectroscopy voxels
MS tai magneettispektroskopia on kuvantamistekniikka, jolla saadaan tietoa kudosten metaboli ittikonsentraatioista tietystä tilavuudesta. Näistä konsentraatioarvoista voidaan tehdä potilaan diagnostiikkaan vaikuttavia johtopäätöksiä. Tekniikkaa voidaan käyttää myös aivokuvantamisessa. Aivot …
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Cardiovascular Risk Factors Predict the Spatial Distribution of White Matter Hyperintensity
… group was compared to the non-risk factor group. Voxels in which WMH frequency was significantly higher (p<0.05) in the risk factor group were mapped. Multivariate analysis consisted of subgroup analysis to minimize confounding of a risk factor on the others. RESULTS: 431891 MNI-space voxels …
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Auto detection in autism
… to a specific task. Generally, the active voxels in the IMRI images are detected using parametric or non-parametric statistical methods in which the fMRI response is assumed to have a model. Such methods are not applicable to detect the active voxels when the fMRI response is unknown. The …
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Recursive Robotic Assemblers
… into a set of compatible building blocks, or voxels, that can assemble and reassemble into more complex structures. The decomposition of the robot is based on a “functional voxel” that routes electrical signals and power, in addition to mechanical forces. Robotic modules are made by …
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Analysis of microstructure in human carpal bone using micro-CT
… 이용하여 월상골은 4.26 × 4.26 × 4.26 ㎜3 (200 voxels), 주상골은 2.13 × 2.13 × 2.13 ㎜3 (100 voxels) 그리고 삼각골은 4.26 × 4.26 × 4.26 ㎜3 (200 voxels)로 ROI를 설정하여 ANT 소프트웨어를 이용하여 3차원 형상을 재건하여 구조적 특징을 대변하는 형태학적 지수(histomorphometry Index)를 구한다. 결과: 각 시편에서 골소주 두께의 분포는 0 ㎛ - 682 ㎛ 까지였으며, …
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Measurement consensus metric aided lidar localization and mapping
… Weighted Dilution of Precision (CWDOP) for all voxels. In this way, the localization consensus metric models the impact of the voxel arrangement on the reliability of the navigation solution. In the LiDAR odometry component of consensus-NDT SLAM, first an intermediate navigation solution is …
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Geometry Processing with Neural Fields
… in explicit representations such as meshes, voxels, and their variants. These shape representations are easy to interpret by human, but they are difficult to be handled by automatic algorithms. For example, voxels can take up a lots of memory and meshes might need careful handle of the …
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Skeleton-based visualization of massive voxel objects with network-like architecture
… of faces, edges, and vertices shared between voxels. A characterization of pairs of cells to be deleted is much simpler than characterizations of simple voxels were before. The grid cell model resolves topologically unclear voxel configurations at junctions and locked voxel configurations …
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Reconstructing neurons from serial section electron microscopy images
… of predicting affinities between nonneighboring voxels, reflecting the structured nature of neuronal boundary detection. We demonstrate the effectiveness of the proposed techniques on large-scale ssEM images acquired from the mouse primary visual cortex. Lastly, we take a radical departure from …
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Application of Multiple Kernel Learning on Brain Imaging for Mental Illness Characterization
… in time for several brain volumetric elements (voxels), thus generating massive amounts of data. On the other hand, fMRI studies acquire images from tens or hundreds of subjects, the rate between the data dimensionality and the sample size being very high. One way of dealing with this issue is …
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Resting-State Functional Connectivity in Veterans with Post-Traumatic Stress Disorder and Combat-Exposed Control Veterans: A Graph Theory Based Network Analysis
… data was analyzed at a higher resolution (20,000 voxels) to construct a network wherein all voxels and voxel measures are considered dependent. Because the networks of the Control Veterans were somewhat atypical, an additional set of analyses was performed comparing connectivity in each veteran …
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Application of bootstrap resampling in fMRI
… method has been used to reliably detect active voxels in the fMRI image of the brain, which is based on repetitive experimentation. The main concern with the test-retest method is the reproducibility of data over these multiple repetitions. Fatigue, habituation, motion artifacts, and …
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Learning viewer-centered projections for 3D shape completion
… output is a 3D mesh inferred without seeing voxels in the training process. This is similar to the intuition that humans remember (and inherently reproduce) 3D shapes without ever ""seeing through"" the underlying volume – we think of objects as seen from certain viewpoints and 3D structure …
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Computational Design of Architected Lattices for Construction Applications
… and high strength-to-weight properties. However, voxels have yet to find widespread integration in the residential or commercial construction industry because of the industry’s distinct system needs. This study identifies the pain points unique to the construction industry that have slowed or …
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Desenvolvimento de modelos antropomórficos patológicos usando técnicas de modelagem 3D para dosimetria numérica
… Monte Carlo. O acoplamento de um fantoma de voxels a um código Monte Carlo é um processo complexo e quase sempre resulta na solução de um problema particular dentro de uma das situações citadas anteriormente. A fidelidade dos dados obtidos na simulação está fortemente ligada à adequação desta …
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Compact representations for fast nonrigid registration of medical images
… a medical object using tens of thousands of voxels, our representations generally contain only a few thousand elements. Tetrahedra facilitate the creation of efficient non-rigid registration algorithms based on finite element methods (FEM). We create a fast, FEM-based method to non-rigidly …
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Efficient volumetric reconstruction from multiple calibrated cameras
… the scene as small volumetric units called voxels. The direct use of pixel values in the images has restricted current methods to operating on scenes with static illumination conditions. Creating a volumetric representation of the scene may also require millions of interdependent voxels …
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Computational control of laser systems for micro-machining
… inside polycarbonate samples. Microstructure voxels ranged from 48 to 181 pm in diameter. Tight focusing was also achieved with this system using a microscope objective lens to produce smaller voxels ranging from 5 to 10 pm in soda-lime glass, fused silica and sapphire samples. The C02 laser …
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Procedural generation of features for volumetric terrains using a rule-based approach.
… a flexible and intuitive method of manipulating voxels from a set of symbol/transform pairs that can provide a variety of different feature shapes and sizes. The second method implements three parametric functions for overhangs, caves and arches. This generates a set of voxels procedurally based …
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Automated defect detection and evaluation in X-ray CT images
… the presence of a defect. Once detected, defect voxels will be clustered to determine shape and size of the associated material faults. The effectiveness of the method will be shown on pores and cracks in steel parts.
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