Mr. Eung-Hun Kim Profile

Eung-Hun Kim

at SonoSite Inc

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Proceedings Article | 14 March 2009 Paper

New flexible multi-volume rendering technique for ultrasound imaging

Eung-Hun Kim, Ravi Managuli, Yongmin Kim

Proceedings Volume 7265, 72651D (2009) https://doi.org/10.1117/12.811510

KEYWORDS: Doppler effect, Tissues, Ultrasonography, Blood circulation, Opacity, 3D image processing, Image fusion, Distortion, Visualization, Color imaging

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Multi-volume rendering is a technique that renders and displays multiple volumes simultaneously. In ultrasound imaging, multi-volume rendering is used for mixing 3D anatomical structures from B-mode imaging with blood flow information from power Doppler imaging (PDI) or color Doppler imaging (CDI). A variety of multi-volume rendering techniques have been proposed, such as post fusion (PF), composite fusion (CF) and progressive fusion (PGF). PF, which combines independently-rendered volumes, is unable to depict a spatial relationship between B-mode images (i.e., tissue structure) and PDI/CDI images (i.e., blood flow). The CF technique suffers from color distortion due to intermixing of hue values. In our recent study, the PGF technique was found to better retain and display tissue structures, vasculature and their depth relationship. However, the disadvantages of PGF include its high computational cost due to the requirement of maintaining a separate rendering pipeline for each volume (i.e., B-mode and power/color Doppler) and potential artifacts of depth-order ambiguity. In this paper, we present a new flexible computationally efficient multivolume rendering technique, named volume fusion (VF), and compare it with existing techniques. We have evaluated the VF method and other multi-volume rendering techniques with data acquired from a commercial ultrasound machine and found that the VF technique can preserve the spatial relationships well amongst multiple volumes without color distortion while the same rendering pipeline can be used to support both PDI and CDI volume fusion.

Proceedings Article | 16 March 2006 Paper

Advanced volume rendering algorithm for real-time 3D ultrasound: integrating pre-integration into shear-image order algorithm

Ravi Managuli, Eung-Hun Kim, Kerem Karadayi, Yongmin Kim

Proceedings Volume 6147, 614702 (2006) https://doi.org/10.1117/12.654090

KEYWORDS: Volume rendering, Ultrasonography, Image quality, Opacity, Digital signal processing, Signal processing, 3D image processing, Medical imaging, Computed tomography, Computing systems

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Volume rendering in 3D ultrasound is a challenging task due to the large amount of computation required for real-time rendering. The shear-warp algorithm has been traditionally used for 3D ultrasound rendering for its effectiveness in lowering computing cost. However, this lowered computing cost does come at the price of reduced image quality due to (a) the presence of final warp interpolation, which smoothes out fine details and (b) sampling only at discrete slice locations, which introduces aliasing, e.g., staircase artifacts. For 3D ultrasound, we have merged pre-integration with the shear-image-order algorithm to overcome both limitations of shear-warp while still enjoying the computational savings. Pre-integration overcomes the aliasing artifacts while shear-image-order preserves details. We have also developed a technique to integrate shading coefficient into pre-integrated rendering. This pre-integrated shear-image-order algorithm, with slightly higher computation than what is required to support the shear-warp algorithm, improves the quality of the rendered image significantly. In this paper, we discuss the pre-integrated shear-image-order algorithm and present the results of subjective quality evaluation on several data sets. We have also analyzed how this algorithm can be implemented on an advanced digital signal processor (DSP) to achieve real-time performance.

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