KEYWORDS: Monte Carlo methods, Scattering, Detection and tracking algorithms, Signal attenuation, Absorption, Modeling, Light scattering, Visualization, Sensors, Protactinium
A method for rendering inhomogeneous volumes using perturbation functions is presented. An approach is proposed for sampling light transmission paths in heterogeneous media. At the initial stage of calculations, light transmission paths are constructed in a closed form. Then the heterogeneous component is averaged by adding a formal medium. Next, the path-tracking algorithm is used. Due to this, there is no need to calculate strict boundaries of the attenuation function. Samples in the closed-form light transmission path and the averaged medium are made separately. This minimizes the costly calculations of collision coefficients that change when traversing space.
KEYWORDS: 3D modeling, Lung, Computed tomography, Rapid manufacturing, 3D printing, Printing, Visual process modeling, Systems modeling, Data modeling, Visualization
The development of such a model of the human lung allowed to master the technology of recreating anatomical structures based on personalized data of spiral computed tomography taking into account individual variability, which can be useful in determining the volume of pathologically altered areas and planning treatment. These approaches also make it possible to significantly improve the technology of training medical and bioengineering specialists.
KEYWORDS: 3D modeling, Data modeling, Visual process modeling, Instrument modeling, Aerodynamics, 3D printing, Prototyping, Mathematical modeling, Computed tomography, Visualization
The essence of the development is to obtain data from imaging tools, as a rule, spiral computed tomography, which allows visualizing bone-cartilaginous and soft tissue structures of the nasal cavity with high spatial resolution and contrast, preparing a 3D model for prototyping using specialized programs - slicers dividing the reproduced object into sections, taking into account the hardware features of the prototyping device, the 3D printing stage for obtaining a mode and implementation of this model is given manipulation - training with the help of selected surgical instruments. After a virtual change in the spatial configuration of the nasal cavity and re-manufacturing of a real model, it is possible to conduct comparative tests of both full-scale models on an aerodynamic bench to determine and analyse indicators of nasal resistance – pressure drop and corresponding air flow.
Periodic fiber structures generally referred to as fiber Bragg gratings are of increasing interest to sensor designers. In recent years, structures in which the phase planes are not perpendicular to the fiber axis have appeared. The paper is devoted to modeling the dependence of the TFBG spectral response on the phase plane tilt angle. The article also contains measurement results of gratings produced on the basis of the model.
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