University of Worcester Worcester Research and Publications
 
  USER PANEL:
  ABOUT THE COLLECTION:
  CONTACT DETAILS:

Analysis of Total Hip Replacements Using Active Ellipses

Kerrigan, Stuart and McKenna, S.J. and Ricketts, I.W. and Wigderowitz, C.A. (2003) Analysis of Total Hip Replacements Using Active Ellipses. In: Proceedings of the Seventh Annual Medical Image Understanding and Analysis Conference. The British Machine Vision Association, Durham, pp. 177-180. ISBN 1 901725 22 7

[img] Text
paper3.pdf
Restricted to Repository staff only

Download (300kB) | Request a copy

Abstract

In this paper we propose a new method for the measurement of wear of a total hip replacement. Our method exhibits a greater degree of automation and is to be both accurate and repeatable. Measurement of wear can be quantified as the displacement of the centre of the femoral head relative to the centre of the acetabular cup or acetabular rim. Our method uses active ellipses - ellipses that, with prior knowledge of the intended contour, search for and alter shape to segment the boundary of the head and rim. A set of radiographs are manually annotated and the characteristics of the boundary of the femoral head and acetabular rim are learned. Two ellipses are sequentially placed on the radiograph, the first deforming around the boundary of the femoral head, the second placed using the previously learned average shape of the acetabular rim and converges around the wire marker. Once both ellipses have converged the distance between their two centres can be calculated and converted to mm as a measure of wear. Our method is validated by comparison with manual fitting of ellipses. A discussion of the results, the clinical relevance and further investigations concludes this paper.

Item Type: Book Section
Additional Information:

The full-text can be accessed via the official URL.

Uncontrolled Keywords: total hip replacement, measurement of wear, acetabular cup or acetabular rim, active ellipses
Subjects: Q Science > QA Mathematics > QA76 Computer software
Divisions: Academic Departments > Worcester Business School
Related URLs:
Depositing User: Stuart Kerrigan
Date Deposited: 06 Jul 2017 10:30
Last Modified: 11 Jul 2017 12:42
URI: https://eprints.worc.ac.uk/id/eprint/5648

Actions (login required)

View Item View Item
 
     
Worcester Research and Publications is powered by EPrints 3 which is developed by the School of Electronics and Computer Science at the University of Southampton. More information and software credits.