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Even with the huge advance of computers and computing power, full three dimensional reconstructions of PET and CT scans belong to the future as far as commercially available scanners and software are concerned. Recent investigations have shown that with the aid of Graphical Processing Units (GPUs) extremely high computational speed might be achieved, which lends itself to the implementation of iterative...
Double-gated in-vivo small animal cone-beam micro-CT scans provide five-dimensional information about the object: the three volume dimensions plus the temporal dimensions of the respiratory motion and the heart motion, respectively. Double gating is typically performed to separate respiratory from cardiac motion when imaging the animal's lung or heart.
We present initial findings from performance testing of a time-of-flight (TOF) PET scanner with respect to the scanner's TOF discriminatory power when compared with a theoretical model. A 2-D geometric model was produced to provide the difference in distance-of-flight of the two photons from a point source to the detector ring. The effectiveness of the discriminatory power was quantified by the percentage...
Channel-edge pinhole designs have been proposed in order to reduce the penetration of gamma rays through the edge of the pinhole aperture. A characterization of penetration and scatter in the pinhole aperture metal can be used in the design of small animal SPECT collimators or for model based corrections during micro-SPECT image reconstruction. In this study the penetration and scatter contributions...
Photon tracing and density estimation are well established techniques in global illumination computation and rendering of high-quality animation sequences. Using traditional density estimation techniques it is difficult to remove stochastic noise inherent for photon-based methods while avoiding overblurring lighting details. In this paper we investigate the use of bilateral filtering for lighting...
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