Results 61 to 70 of about 114,423 (180)
Robust semi-automated path extraction for visualising stenosis of the coronary arteries [PDF]
, 2008 Computed tomography angiography (CTA) is useful for diagnosing and planning treatment of heart disease. However, contrast agent in surrounding structures (such as the aorta and left ventricle) makes 3-D visualisation of the coronary arteries difficult ...
Achenbach +43 more
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Application of Snell's law in reflection raytracing using the multistage fast marching method
Earthquake Research Advances, 2021 Accurate calculations of travel times and raypaths of reflection waves are important for reflection travel time tomography. The multistage shortest path method (MSPM) and multistage fast marching method (MFMM) have been widely used in reflection wave ...
Xingzhong Li, Wei Zhang
doaj +1 more source
, 2017 The general space-time evolution of the scattering of an incident acoustic plane wave pulse by an arbitrary configuration of targets is treated by employing a recently developed non-singular boundary integral method to solve the Helmholtz equation in the
Chan, Derek Y. C. +2 more
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A multilevel fast-marching method
, 2022 We introduce a new numerical method to approximate the solutions of a class of static Hamilton-Jacobi-Bellman equations arising from minimum time optimal control problems. We rely on several grid approximations, and look for the optimal trajectories by using the coarse grid approximations to reduce the search space for the optimal trajectories in fine ...
Akian, Marianne +2 more
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Two Fast Marching Methods for Hamilton–Jacobi Equations [PDF]
PAMM, 2007 AbstractWe introduce and analyze two new Fast Marching (FM) methods based on a semi‐Lagrangian (SL) approximation (see [2] for a more complete presentation). The Characteristics driven Fast Marching method accepts more than one node at every iteration using a dynamic condition which leads to a faster convergence.
CRISTIANI, Emiliano, FALCONE, Maurizio
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CDDT: Fast Approximate 2D Ray Casting for Accelerated Localization
, 2018 Localization is an essential component for autonomous robots. A well-established localization approach combines ray casting with a particle filter, leading to a computationally expensive algorithm that is difficult to run on resource-constrained mobile ...
Karaman, Sertac, Walsh, Corey
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Anisotropic Fast Marching in ITK
The Insight Journal, 2015 The Fast Marching algorithm is an efficient numerical method for computing the distance and shortest path between points of a domain. For that purpose, it solves a front propagation problem, which can be of interest in itself. The method has numerous applications, ranging from motion planning to image segmentation. The unit of length, for computing the
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, 2017 We present the concept of fiber-flux density for locally quantifying white matter (WM) fiber bundles. By combining scalar diffusivity measures (e.g., fractional anisotropy) with fiber-flux measurements, we define new local descriptors called Fiber-Flux ...
C Stamile +24 more
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Hamiltonian Fast Marching: A Numerical Solver for Anisotropic and Non-Holonomic Eikonal PDEs [PDF]
Image Processing On Line, 2019 We introduce a generalized Fast-Marching algorithm, able to compute paths globally minimizing a measure of length, defined with respect to a variety of metrics in dimension two to five. Our method applies in particular to arbitrary Riemannian metrics, and implements features such as second order accuracy, sensitivity analysis, and various stopping ...
Mirebeau, Jean Marie, Portegies, Jorg
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Teleseismic Tomography for Imaging the Upper Mantle Beneath Northeast China
Applied Sciences, 2020 Tomographic imaging technology is a geophysical inversion method. According to the ray scanning, this method carries on the inversion calculation to the obtained information, and reconstructs the image of the parameter distribution rule of elastic wave ...
Zhuo Jia, Gongbo Zhang
doaj +1 more source