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Published online before print October 19, 2007, 10.1148/radiol.2452061281
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(Radiology 2007;245:855-862.)
© RSNA, 2007

Technical Developments

An Automatic Model-based System for Joint Space Measurements on Hand Radiographs: Initial Experience1

Philipp Peloschek, MD, Georg Langs, PhD, Michael Weber, MSc, Johannes Sailer, MD, Michael Reisegger, MD, Herwig Imhof, MD, Horst Bischof, PhD, and Franz Kainberger, MD

1 From the Department of Diagnostic Radiology, Medical University of Vienna, Vienna, Austria (P.P., M.W., J.S., M.R., H.I., F.K.); Institute for Computer Graphics and Vision, Graz University of Technology, Graz, Austria (G.L., H.B.); and Institute of Computer Aided Automation, Vienna University of Technology, Favoritenstrasse 9/183-2, 4th Floor, HB 04 08, A-1040 Vienna, Austria (G.L.). Received July 25, 2006; revision requested September 27; revision received December 20; accepted January 29, 2007; final version accepted April 2. Supported by grant no. ~P17083-N04 from the Austrian Funds for Scientific Research. Address correspondence to G.L. (e-mail: langs{at}prip.tuwien.ac.at).

This ethics committee–approved pilot study was performed with informed consent. A Web-based service that was developed for automated measurement of joint space and automatic analysis of radiographs was tested prospectively. A total of 160 metacarpophalangeal joint spaces were measured in 20 patients (average age, 48 years; age range, 18–89 years; 16 women) suspected of having rheumatoid arthritis or osteoarthritis. The technical success rate was 93%. The smallest detectable difference in repeated automatic joint space width measurements varied from 0.08 to 0.31 mm, and the coefficient of variation was 2%–7%. Compared with the reference standard (interactive segmentation of the joint space widths) measurements, results were within a mean error of 0.19–0.40 mm. The proposed Web-based service enables reproducible joint space measurements to be obtained in metacarpophalangeal joints with moderate erosive and osteophytic disease.

© RSNA, 2007






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