Dr. Feng Qiu Profile

Dr. Feng Qiu

at Siemens Corp Corporate Technology

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Proceedings Article | 17 February 2012 Paper

Nonlinear ray tracing for vessel enhanced visualization

Feng Qiu, Wei Hong

Proceedings Volume 8316, 83161N (2012) https://doi.org/10.1117/12.911488

KEYWORDS: Ray tracing, Angiography, Volume rendering, Visualization, 3D image processing, Binary data, Eye, Optical spheres, Feature extraction, Vascular diseases

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3D visualization of angiography data is an important preprocessing step in diagnosis of vascular disease. This paper describes an efficient volume rendering method to emphasize feature-rich region (or focus) in the 3D angiography data. The method takes the input 3D angiography data and computes the focus with user specification or certain feature extraction algorithms. Then, a distance map is constructed based on the description of the focused region(s). While rendering the 3D angiography data, the nonlinear ray tracing method is used and the gradient of the distance volume is applied to guide ray marching. In the result image, the focused region(s) appears larger than in the normal ray-casting image, while the context (other regions of the volume) can be still preserved in the image (maybe displayed in a shrink size). This method avoids deforming the original volume to magnify focus regions, which is expensive to compute, thus improves the performance.

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