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- W2155759533 abstract "A deterministic algorithm simulating phase contrast (PC) x-ray images for complex 3dimensional (3D) objects is presented. This algorit hm has been implemented in a simulation code named VXI (Virtual X-ray Imaging). The physical model chosen to account for PC technique is based on the Fresnel-Ki rchhoff diffraction theory. The algorithm consists mainly of two parts. The fir st one exploits the VXI ray-tracing approach to compute the object transmission functio n. The second part simulates the PC image due to the wave front distortion introduced b y the sample. In the first part, the use of computer-aided drawin g (CAD) models enables simulations to be carried out with complex 3D objects. Differently from the VXI original version, which makes use of an object description via triangular f acets, the new code requires a more “sophisticated” object representation based on Non- Uniform Rational B-Splines (NURBS). As a first step we produce a spatial high resolutio n image by using a point and monochromatic source and an ideal detector. To simu late the polychromatic case, the intensity image is integrated over the considered x -ray energy spectrum. Then, in order to account for the system spatial resolution propertie s, the high spatial resolution image (mono or polychromatic) is convolved with the total point spread function of the imaging system under consideration. The results supplied by the presented algorithm are examined with the help of some relevant examples." @default.
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- W2155759533 date "2007-01-01" @default.
- W2155759533 modified "2023-09-25" @default.
- W2155759533 title "New developments in simulating X-ray phase contrast imaging" @default.
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