J. T. Duda, H. Zhang, T. J. Simon, J. C. Gee Bioengineering, University of Pennsylvania, Philadelphia, PA, United States, Computer Science, University of Pennsylvania, Philadelphia, PA, United States, M.I.N.D. Institute, University of California, Davis, Davis, CA, United States, Radiology, University of Pennsylvania, Philadelphia, PA, United States Introduction Diffusion Tensor MRI (DT-MRI) has...

We propose an optimization method for estimating patientspecific muscle fiber arrangement from clinical CT. Our approach first computes the structure tensor field to estimate local orientation, then a geometric template representing fiber arrangement is fitted using a Bspline deformation by maximizing fitness of the local orientation using a smoothness penalty. The initialization is computed wi...

In dentin restoration, collagen fiber network infiltration is an issue. Using data from the litterature, we have constructed a relevant numerical geometrical model of the network. The specificity of our model is that the fibers are taken into account implicitly using a regularized Heaviside function. This function is either used to set the viscosity or to localize the contact line where capilla...

Background: Multiple beams are generally used with an increased possibility that the beam axis intersects the treatment table. Treatment tabletops are commonly made of carbon fiber due to its high mechanical strength and rigidity, low specific density, extremely light and low radiation beam attenuation properties. Purpose of this paper is investigated the dose changes in the buildup region and ...

Abstract We describe an algorithm for generating fiber-filled volume elements use in computational homogenization schemes. The permits to prescribe both a length distribution and fiber-orientation tensor of second order, composites with industrial filler fraction can be generated. Typically, short-fiber composites, data on the fiber-length volume-weighted order is available. consider model wher...

Fig. 3. The average atlas method results in premature termination of the forceps minor. The proposed method gives a more complete reconstruction of the bundle. Fig. 1. Orientations estimated based on the average atlas method and the proposed method. The proposed method preserves more fiber crossing and estimates the orientations with higher accuracy. Accurate Estimation of Local Fiber Orientati...

We present simulation and experimental results of fiber Bragg grating responses to transverse stress in microstructure fibers. The grating wavelength shifts and peak splits are studied as a function of external load and fiber orientation. Both simulation and measurement results indicate that the sensitivity of grating sensors to the transverse stress can be enhanced by a factor of eight in a tw...

An effective technique for investigating human brain connectivities, is the reconstruction of fiber orientation distribution functions based on diffusion-weighted MRI. To reconstruct fiber orientations, most current approaches fit a simplified diffusion model, resulting in an approximation error. We present a novel approach for estimating the fiber orientation directly from raw data, by convert...