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 290 for “"Voxel"”.
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Single-Voxel- versus Multi-Voxel-Protonen-MR-Spektroskopie bei verschiedenen intrakraniellen Läsionen
… Läsionen mittels Singelvoxel- versus Multivoxel-MR-Protonen-Spektroskopie signifikant unterschiedliche Ergebnisse bestehen. Untersucht wurden Hirntumoren der WHO-Grade 2 bis 4, Metastasen und fokal-entzündliche Läsionen. Zusammenfassend ist die Unterscheidung zwischen …
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Voxel-space shape grammars
… a novel extension to shape grammars, in which a voxel representation of the generated shapes is used.
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A GPU Accelerated Signed Distance Voxel Modeling System
… data, is introduced here in order to enable the voxel modeler more versatile. Instead of only compatible with volumetric data or image stacks data, the 3D SDF reconstruction is desired for directly importing surface scanned point cloud and creating the signed distance eld version of the imported …
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Three-Dimensional Voxel-Based Neural Style Transfer and Quantification
… in combination with extensively increased voxel-shape resolutions. The classification networks do not only match state-of the-art accuracy, but many crucial adaptations are incorporated to enhance following usage during Neural Style Transfer. In order to substantiate our results and …
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Voxel-Level Absorbed Dose Calculations With A Deterministic Grid-Based Boltzmann Solver For Nuclear Medicine and The Clinical Value of Voxel-Level Calculations
<p>Voxel-level absorbed dose (VLAD) is rarely calculated for nuclear medicine (NM) procedures involving unsealed sources or 90Y microspheres (YM). The current standard of practice for absorbed dose calculations in NM utilizes MIRD S-values, which 1) assume a uniform distribution in organs, 2) do …
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Digital twin volume registration for Voxel-based closed-loop machining systems
… thesis presents a simple but novel technique for voxel volume model registration. This is done through the application of registering and machining near-net-shape structures and rough castings. Through the implementation of a Euclidean distance transform and variance calculation, an …
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Skeleton-based visualization of massive voxel objects with network-like architecture
… and external memory algorithms for computing voxel skeletons of massive voxel objects with complex network-like architecture and for converting these voxel skeletons to piecewise linear geometry, that is triangle meshes and piecewise straight lines. The presented techniques help to tackle the …
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Development of a voxel-based meta-analytic method for neuroimaging studies
… individual studies. While a number of suitable voxel-based meta-analytic methods for neuroimaging data had been developed at the time this thesis was conceived, they also suffered from a series of important drawbacks such as the separate analyses of positive (e.g. grey matter volume increases) …
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Using a voxel-based krogh cylinder array to simulate microvascular contrast enhancement
… this study is to better simulate microscopic and voxel-based dynamic contrast enhancement in magnetic resonance imaging. Specifically, errors imposed by the traditional two-compartment model are reduced by introducing a novel Krogh cylinder network. The two-compartment model was developed for …
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Procedurally generating surface detail for 3D models using voxel-based cellular automata
… to modify. As an alternative, a grid of voxels can model 3D shapes and surfaces, similar to how 2D pixels form an image. The regular form of voxel-based models is easier to alter, at the cost of additional computational overhead. One technique for generating and altering voxel content is …
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Assessing and Modulating Tumor Dose Coverage of Unsealed Radionuclide Therapies using Voxel Dosimetry
… ratio (TBR) and then discretized into cubic voxels using MATLAB to generate activity maps. Spatial resolution blurs and different voxel sizes were computed from the discretized MATLAB activity maps. Absorbed dose maps were generated using both DVK and local deposition (LDM) dose algorithms …
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Voxel-Based Lesion Symptom Mapping as a Predictor of Motor Impairment after Stroke
<p>Voxel-based Lesion Symptom Mapping (VLSM) analysis was utilized to predict degree of motor impairment based on lesion location. Magnetic Resonance Imaging (MRI) was used to collect T1 weighted structural images of lesions in 11 participants who suffered primarily left hemisphere damage due to …
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A Voxel-Based Approach to the Real-Time Simulation of Sands and Soils
… algorithms, and implementation details for a voxel-based terrain rendering system that simulates large, dynamic bodies of sands and soils in real-time 3D graphics applications. We describe a technique for representing soil in a 3D voxel grid, and we introduce a set of GPU-based algorithms that …
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Statistical methods for quantification of voxel-level image noise in PET/CT imaging
… regions of interest. However, estimation of voxel-level noise characteristics such as variance/covariance is very challenging in clinical PET settings, due to the absence of genuine replicates. With dynamic multi-frame PET image data, it has been possible to construct a practical image-domain …
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Neuroanatomical differences in adults and children who stutter: a voxel-based morphometry study
… children groups were analyzed separately with voxel-based morphometry (VBM), an unbiased, whole-brain based volumetric technique. Adult group comparisons consisted of adults who stutter (n=12) versus adult controls (n=25), and pediatric group comparisons included recovered children (n=7); …
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Impresión 3D dental en Argentina: Estudio de Mercado y Plan de Marketing para Voxel
… una estrategia de marketing para la empresa Voxel que desea dar el servicio de impresión 3D Dental. Para esto es necesario realizar un estudio de mercado sobre los posibles usuarios, un análisis externo e interno sobre las condiciones de las empresas que podrían ofrecer este tipo de servicio …
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Design, Analysis and Fabrication of Complex Structures using Voxel-based modeling for Additive Manufacturing
… represent and process solid models as a set of voxels (three-dimensional pixels). Through this, one is able to efficiently realize parts featuring complex geometries and functionally graded materials. This thesis specifically aims to explore applications in three distinct fields namely, (i) …
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Short echo time single voxel magnetic resonance spectoscopy in the characterisation of childhood brain tumours.
INTRODUCTION Brain tumours are the most common solid tumour in childhood, while Magnetic Resonance Spectroscopy (MRS) studies have been performed on brain tumours previously, the majority have been performed on the adult patient population and at long echo times. The work presented in this thesis …
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Printing the invisible : bridging the gap between data and matter through voxel-based 3D printing
… 3D printing. The thesis focuses on methods for voxel-based additive fabrication at high spatial resolution of three-dimensional data sets including - but not limited to point clouds, volumes, lines and graphs, and image stacks. This is achieved while maintaining the original data with high …
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