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By Jean Meeus

Acknowledged in book," almost each past guide on celestial calcuations was once compelled to depend on formaulae for solar Moon and planets that have been constructed within the final century or ahead of 1920.

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For comparison, two polynomial algorithms were used. In the sinogram we achieved an improvement of the image quality using the NFFT interpolation. However, in the reconstructed images we obtained only a marginal improvement compared to spline based interpolation. This behavior may be due to the smoothness of the NFFT interpolation, since the filtered backprojection includes a high pass filtering. Taking this into account, an appropriate choice of the damping factors w ˆ may yield better reconstruction results.

Scene with texture a (left), with texture b (middle) and, with no texture (right). For the textures see Fig. 2 32 C. Schaller et al. intuitive handling on a common PC by combining polygonal surface rendering with a guided-navigation paradigm. In virtual endoscopy, crucial depth information is significantly reduced by projecting a 3D scene onto a 2D screen. One of the main ideas of illustrative rendering is to provide additional visual cues for the interpretation of a scene. The most important source of depth cues in virtual endoscopy is the relative movement of objects due to shifts in perspective (motion parallax).

The DCE T1 -weighted features are circularity and variance of the radial gradient histogram as described in [5], reflecting the lesion shape and the sharpness of its margin, respectively. 6 1−Specificity Fig. 1. 8 z 1 Computer-Aided Diagnosis in Breast MRI 15 three T2 -weighted features are the normalized α-percentile for the eroded lesion segmentation (α = 20%) and the normalized α-percentile for the lesion shell with (α = 92%, t = 2mm) and (α = 98%, t = 20mm). The latter features resemble clinical practice of rating the intensities within the lesion and within the enclosing shell of non-lesion tissue.

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