Spiral CT Volumetry of Below-Knee Residua

Kirk E. Smith, Michael W. Vannier, Paul K. Commean

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Spiral CT volumetric imaging, processing, and analysis of lower extremity residua were developed and tested using cylindrical phantom test objects and a cadaver lower extremity. Spiral CT scan examination was performed to generate image volumes that were segmented to estimate volumes of interest. These volumes were compared to physical volume measurements obtained by hydrostatic weighing. Hydrostatic weighing and spiral CT volume determinations were compared to calculated volumes based on measured dimensions of two cylindrical phantoms. Threshold-based segmentation of below-knee residua scanned with spiral CT in air was shown accurate to within 3% compared to hydrostatic and analytically derived volumes of phantom test objects. Volume of interest segmentation methods of spiral CT image data had a standard error of 0.15% for a cadaver leg. The feasability and validity of spiral CT scanning and segmentation for volumetric studies of lower limb residua were demonstrated.

Original languageEnglish
Pages (from-to)235-241
Number of pages7
JournalIEEE Transactions on Rehabilitation Engineering
Issue number3
StatePublished - Sep 1995


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