Evaluation of the effects of titanium induced CT artifacts on biomechanical models generation

Cinzia Zannoni, Marco Viceconti, Luisa Pierotti, Angelo Cappello

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

X-Ray CT is capable of providing detailed information about the geometry and material properties of musculoskeletal structures. Such accurate data would be of great interest in studying the effect of orthopaedic implants on bone adaptive behaviour. Metallic implants, however, generate artifacts, typically seen as starburst streaking, which can seriously degrade the accuracy of CT data. Aim of this study was to measure the artifactual errors produced in the CT images of a cortical bone and water equivalent materials phantom by a titanium alloy hip joint prosthetic stem. The image data have been analyzed and the average error over the 10 mm thick cortical bone surrounding the implant evaluated. Subsequently the mean error on each pixel crown surrounding the implant was assessed. The effect of this local error on the material properties assessment of a biomechanical model of the bone-implant complex was estimated. An apparent increase in bone density of approximately 3% was observed in the cortical bone region. The effect of the titanium implant, however, is confined within a 4-8 pixels (1.2-2.4 mm) distance from the prosthetic implant. Even if the local perturbation is very difficult to correct, some possibilities to reduce the effect of the artifactual errors on the material properties assignment to a biomechanical model are proposed.

Original languageEnglish
Title of host publicationAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
PublisherIEEE
Pages1859-1861
Number of pages3
Volume4
Publication statusPublished - 1997
EventProceedings of the 1997 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society - Chicago, IL, USA
Duration: Oct 30 1997Nov 2 1997

Other

OtherProceedings of the 1997 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society
CityChicago, IL, USA
Period10/30/9711/2/97

ASJC Scopus subject areas

  • Bioengineering

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    Zannoni, C., Viceconti, M., Pierotti, L., & Cappello, A. (1997). Evaluation of the effects of titanium induced CT artifacts on biomechanical models generation. In Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings (Vol. 4, pp. 1859-1861). IEEE.