Evaluation of CT accuracy in orthopaedic implants geometry reconstruction

Cinzia Zannoni, Marco Viceconti, Luisa Pierotti, Angelo Cappello

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

X-Ray CT has the potential to provide precise and accurate data from which the mechanical properties of bone can be derived. Such data would be useful in understanding bone behaviour around metallic orthopaedic implants. Metallic objects, however, generate artifacts, typically seen as starburst streaking, which can seriously degrade the accuracy of the data. Aim of this study was to evaluate new generation CT scanners accuracy in the assessment of geometric shape and features of Titanium Hip Joint Prosthetic Stems. A measuring procedure has been developed and its accuracy assessed. This procedure compares the metal stem contours obtained from the transaxial CT images to the cross section of the stem solid model provided by the producer. Results show that modern CT scanners images provide precise information about geometric shape and features of titanium orthopaedic implants. CT reconstruction accuracy, in fact, has shown to be comparable to the image pixel size (0.3 mm) which is the theoretical limit of the resolution of the CT scanner. Two hip joint titanium implants with the same geometry and a different calliper have been analyzed. Smaller calliper stem yielded slightly higher errors, suggesting that CT accuracy depends on the implant dimensions and geometry. However, for both stems, the 90% of the measured errors fell within 0.6 mm (2 pixels) which can be regarded as the lower bound for titanium stem reconstruction accuracy.

Original languageEnglish
Title of host publicationAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
PublisherIEEE
Pages1862-1864
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

Fingerprint Dive into the research topics of 'Evaluation of CT accuracy in orthopaedic implants geometry reconstruction'. Together they form a unique fingerprint.

  • Cite this

    Zannoni, C., Viceconti, M., Pierotti, L., & Cappello, A. (1997). Evaluation of CT accuracy in orthopaedic implants geometry reconstruction. In Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings (Vol. 4, pp. 1862-1864). IEEE.