Abstract
The generation of multiview stereoscopic images of large volume rendered data demands an enormous amount of calculations. We propose a method for hardware accelerated volume rendering of medical data sets to multiview lenticular displays, offering interactive manipulation throughout. The method is based on buffering GPU-accelerated direct volume rendered visualizations of the individual views from their respective focal spot positions, and composing the output signal for the multiview lenticular screen in a second pass. This compositing phase is facilitated by the fact that the view assignment per subpixel is static, and therefore can be precomputed. We decoupled the resolution of the individual views from the resolution of the composited signal, and adjust the resolution on-the-fly, depending on the available processing resources, in order to maintain interactive refresh rates. The optimal resolution for the volume rendered views is determined by means of an analysis of the lattice of the output signal for the lenticular screen in the Fourier domain.
Highlights
New developments in medical imaging modalities lead to ever increasing sizes in volumetric data
The orientation of the 3D data set followed in realtime the orientation of an X-ray C-arm system; see Figure 1. This approach aids in reducing the X-ray radiation, since the physician can choose the optimal orientation to acquire Xray images without radiating. It improves the interpretation of the live projective 2D X-ray image, which is presented on a separate display, since the 3D data set on the stereoscopic screen gives a proper depth impression through the stereovision of the lenticular screen
We propose a two-pass algorithm: first the individual views from the different foci positions are separately rendered to an orthogonal grid
Summary
New developments in medical imaging modalities lead to ever increasing sizes in volumetric data. This approach aids in reducing the X-ray radiation, since the physician can choose the optimal orientation to acquire Xray images without radiating It improves the interpretation of the live projective 2D X-ray image, which is presented on a separate display, since the 3D data set on the stereoscopic screen (which is in the same orientation) gives a proper depth impression through the stereovision of the lenticular screen. In this application, interactivity is very important, and the refresh rate has to be sufficient to provide a realtime impression. The fact that the clinician is not limited to single sweet spot makes these displays suitable for this environment, since the clinical intervention demands that the operator can be positioned freely in the range close to the patient
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