3-D Imaging Using Normalized Gradient Shading in CT and MRI

Carl R. Crawford; Harvey E. Cline; William E. Lorensen; Bruce C. Teeter

doi:10.1117/12.976464

8 May 1989 3-D Imaging Using Normalized Gradient Shading in CT and MRI

Carl R. Crawford, Harvey E. Cline, William E. Lorensen, Bruce C. Teeter

Proceedings Volume 1091, Medical Imaging III: Image Capture and Display; (1989) https://doi.org/10.1117/12.976464
Event: Medical Imaging III, 1989, Newport Beach, CA, United States

Abstract

In previous work3-4 two algorithms were developed called Marching Cubes and Dividing Cubes for the three-dimensional display of objects contained in CT and MRI images. A key to these algorithms is that surface normals are derived from the normalized gradient of the original tomographic images. The resulting images have been subjectively judged superior to images generated with the Cuberille and Ray-casting algorithms. This paper shows how the Cuberille and Ray-casting algorithms can be extended to use the normalized gradient. The image quality attainable using the four existing and the two extended algorithms will be demonstrated and the implementation trade-offs for the algorithms will be discussed. We will also show how the display methods can be extended using recursive applications of custom-designed region-growing algorithms. Results will be shown that demonstrate how the modified algorithms have been used to disarticulate bones and to isolate soft tissue structures in CT and MRI.

Citation Download Citation

Carl R. Crawford, Harvey E. Cline, William E. Lorensen, and Bruce C. Teeter "3-D Imaging Using Normalized Gradient Shading in CT and MRI", Proc. SPIE 1091, Medical Imaging III: Image Capture and Display, (8 May 1989); https://doi.org/10.1117/12.976464

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