Clifford Lindsay

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PURPOSE This paper describes the technique of stereolithographic biomodelling and its application to a patient who was treated using orbital brachytherapy. METHODS AND MATERIALS The process uses a moving laser beam, directed by a computer, to draw cross-sections of the model onto the surface of photo-curable liquid plastic. Using a stereolithographic(More)
Diffraction, interference, dispersive refraction and scattering are four wavelength-dependent mechanisms that produce iridescent colors. The per-wavelength sampling required to render iridescence significantly increases the computation required to render irides-cence in real time. Furthermore, diffraction exhibits much higher frequencies and sharper peak(More)
Graphics rendering on mobile devices is severely restricted by available battery energy. The frame rate of real-time graphics applications fluctuates due to continual changes in the LoD, visibility and distance of scene objects, user interactivity, complexity of lighting and animation, and many other factors. Such frame rate spikes waste precious battery(More)
Technological advances in mobile devices have made them attractive for many previously infeasible image synthesis applications. Mobile users may roam between a wide range of environmental lighting including dim theaters, lit offices, and sunlight. Viewing images in diverse lighting situations poses a challenge: while our eyes can adapt to environmental(More)
Mobile games and other mobile graphics applications have become popular because untethered computing is convenient and ubiquitous entertainment is compelling. However, rendering graphics on mobile devices faces challenges due to limited system resources, such as battery energy, low memory and disk space. Real time frame rates, low energy consumption and(More)
The recent popularity of networked graphicsapplications such as distributed military simulators andonline games, has increased the need to transmit large 3Dmeshes and textures over wireless networks. To speed up large mesh transmission over low-bandwidth wireless links, we use a wavelet-based technique that aggressively compresses large meshes and enables(More)
Respiratory motion of the heart impacts the diagnostic accuracy of myocardial-perfusion emission-imaging studies. Amplitude binning has come to be the method of choice for binning list-mode based acquisitions for correction of respiratory motion in PET and SPECT. In some subjects respiratory motion exhibits hysteretic behavior similar to damped non-linear(More)