Abstract: At the 1999 meeting of SPIE Medical Imaging, we presented results that demonstrated that a software-only-based technique, Shell Rendering, was capable of rendering hard surfaces at rates faster than hardware-assisted, triangle- based surface rendering by a factor of 18 to 31 while maintaining comparable image quality. We noted that the framework of Shell Rendering actually encompasses both hard surface rendering of medical image data via Shell Rendering in software with two techniques of OpenGL-based hardware- assisted volume rendering using 2D and 3D texture mapping. Although our previous results demonstrated that shell rendering is faster than hardware-assisted surface rendering, its speed is comparable to but slightly lower than hardware-assisted volume rendering methods. Detailed timing results for various input medical image data sets as well as for various computer platforms are presented in the paper. The images produced by the various methods are presented as well for subjective quality assessment. We conclude that for medical image visualization, Shell Rendering is an efficient technique that combines aspects of surface rendering and volume rendering. Furthermore, it accomplishes this without requiring expensive hardware while producing high quality images on PCs using an entirely software-based approach. !32
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机译：摘要：在1999年的SPIE Medical Imaging会议上，我们提供的结果表明，基于软件的技术Shell Rendering能够以比硬件辅助的基于三角形的表面渲染更快的速率渲染硬表面。同时保持可比图像质量的18至31。我们注意到，Shell Rendering的框架实际上包括通过软件中的Shell Rendering和使用2D和3D纹理映射的基于OpenGL的硬件辅助体积渲染的两种技术，对医学图像数据进行硬表面渲染。尽管我们以前的结果表明，外壳渲染比硬件辅助的表面渲染更快，但其速度与硬件辅助的体积渲染方法相当，但略低于硬件辅助的体积渲染方法。本文介绍了各种输入医学图像数据集以及各种计算机平台的详细时序结果。还介绍了通过各种方法产生的图像以进行主观质量评估。我们得出结论，对于医学图像可视化，壳层渲染是一种结合了表面渲染和体积渲染方面的有效技术。此外，它无需使用昂贵的硬件即可完成此任务，同时使用完全基于软件的方法在PC上生成高质量图像。 ！32
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