Calibration of Bi-planar Radiography with a Rangefinder and a Small Calibration Object

• Type: Article in International Conference Proceedings Book
• Date: 2008

Authors

Daniel Cardoso de Moura (Author) Other; Jorge Manuel Gomes Barbosa (Author) FEUP; João Manuel R. S. Tavares (Author) FEUP; Reis, AM (Author) Other

Conference proceedings International

Title: ADVANCES IN VISUAL COMPUTING, PT I, PROCEEDINGS

Pages: 572-581

4th International Symposium on Visual Computing

Las Vegas, NV, DEC 01-03, 2008

Indexing

ISI Web of Knowledge - 5 Citations

Scopus - 7 Citations

Other information

Authenticus ID: P-007-QRT

DOI: 10.1007/978-3-540-89639-5_55

Abstract (EN): In this paper we propose a method for geometrical calibration of bi-planar radiography that aims at minimising the impact of calibration objects on the content of radiographs, while remaining affordable. For accomplishing this goal, we propose a small extension to conventional imaging systems: a low-cost rangefinder that enables to estimate some of the geometrical parameters. Even with this extension; a small calibration object is needed for correcting scale. The proposed method was tested on 17 pairs of radiographs of a phantom object of known dimensions. For calculating scale; only a reference distance of 40mm was used. Results show a RMS error of 0.36mm with 99% of the errors inferior to 0.85mm. We conclude that the method presented here performs robustly and achieves sub-millimetric accuracy, while remaining affordable and requiring only two radiopaque marks visible in radiographs.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10