Calibration of bi-planar radiography with minimal phantoms

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

Authors

Daniel Cardoso de Moura (Author) FEUP; Jorge Manuel Gomes Barbosa (Author) FEUP; João Manuel Ribeiro da Silva Tavares (Author) FEUP; Ana Reis (Author) Other

Conference proceedings National

Title: DSIE'08 - Doctoral Symposium on Informatics Engineering 2008

Initial page: 10 pag.

DSIE'08 - Doctoral Symposium on Informatics Engineering 2008

Faculdade de Engenharia da Universidade do Porto, Porto, Portugal, 7/8 February 2008

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

CORDIS: Technological sciences > Engineering > Biomedical enginnering ; Technological sciences > Technology > Computer technology > Image processing

Other information

Abstract (EN): In this paper we propose a method for the geometrical calibration of bi-planar radiography that aims at minimising the impact of calibration phantoms on the content of radiographs. These phantoms are required for determining scale or to estimate the geometrical parameters of the system. Unfortunately, they often overlap anatomical structures. For accomplishing this goal, we propose a small extension to conventional imaging systems: a distance measuring device that enables to estimate some of the geometrical parameters. This leads to a reduction of the search space of solutions, which makes possible reducing requirements of calibration phantoms. 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. Additionally, the requirements of the calibration phantom are very low when compared with other methods, but experiments with anatomical structures should be conducted to confirm these results.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10