Digital automated RSA compared to manually operated RSA

Journal article (2000)

Authors

E.R. Valstar ImPhys/Quantitative Imaging
HA Vrooman External organisation
S Toksvig-Larsen External organisation
L Ryd External organisation
RGHH Nelissen External organisation
Research Group
ImPhys/Quantitative Imaging
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Published Date

2000

Language

Undefined/Unknown

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Research Group

ImPhys/Quantitative Imaging

Abstract

The accuracy of digital Roentgen stereophotogrammetric analysis (RSA) was compared to the accuracy of a manually operated RSA system. For this purpose, we used radiographs of a phantom and radiographs of patients. The radiographs of the patients consisted of double examinations of 12 patients that had a tibial osteotomy and of double examinations of 12 patients that received a total hip prosthesis. First, the radiographs were measured manually with an accurate measurement table. Subsequently, the images were digitized by a film scanner at 150 DPI and 300 DPI resolutions and analyzed with the RSA-CMS software. In the phantom experiment, the manually operated system produced significantly better results than the digital system, although the maximum difference between the median values of the manually operated system and the digital system was as low as 0.013 mm for translations and 0.033° for rotations. In the radiographs of the patients, the manually operated system and the digital system produced equally accurate results: no significant differences in translations and rotations were found. We conclude that digital RSA is an accurate, fast, and user friendly alternative for manually operated RSA. Currently, digital RSA systems are being used in a growing number of clinical RSA-studies.

Author Keywords: Digital RSA; Micromotion; Accuracy; Validation