Reliable identification of sphere-shaped femoral heads in 3D image data

Heinrich Martin Overhoff; Sven Ehrich; Ute von Jan

doi:10.1117/12.348536

21 May 1999 Reliable identification of sphere-shaped femoral heads in 3D image data

Heinrich Martin Overhoff, Sven Ehrich, Ute von Jan

Proceedings Volume 3661, Medical Imaging 1999: Image Processing; (1999) https://doi.org/10.1117/12.348536
Event: Medical Imaging '99, 1999, San Diego, CA, United States

Abstract

A new method is presented, which enables the reliable measurement of the femoral head sphere parameters (center coordinates and diameter) from tomographic image data, even when the raw data are erroneous. The hip joints of 13 newborns were scanned by a self developed 3-D ultrasound system. After automatic image segmentation, the femoral head is represented by spatially arranged voxel clouds. The 3-D image data are substantially corrupted by different types of errors. Moreover, the data only describe a segment of a sphere, whose area is about 10% of the sphere. This circumstance increases the identification problem. The problem of fitting the sphere parameters is solved by a robust technique based on rejection strategies for irrelevant points and data sets. The method was applicable in 21 of 26 cases. Substantial differences between automatically and expert determined sphere parameters were only observed for highly corrupted data sets, where the identification problem is inherently unstable. The identification method yielded correct and reliable identification of geometric measures from 3-D ultrasound image volumes and promises to be applicable also for other parameterized geometries and other tomographic image modalities as X-ray CT or MRI.

Citation Download Citation

Heinrich Martin Overhoff, Sven Ehrich, and Ute von Jan "Reliable identification of sphere-shaped femoral heads in 3D image data", Proc. SPIE 3661, Medical Imaging 1999: Image Processing, (21 May 1999); https://doi.org/10.1117/12.348536

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