DMFR
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Schulze, R. K.
Right arrow Articles by d'Hoedt, B.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Schulze, R. K.
Right arrow Articles by d'Hoedt, B.

Dentomaxillofacial Radiology, Vol 31, Issue 1 32-38, Copyright © 2002 by British Institute of Radiology

ARTICLES

A method to calculate angular disparities between object and receptor in "paralleling technique"

R. K. Schulze and B. d'Hoedt
Department of Oral Surgery, Dental School, Johannes Gutenberg University, Augustusplatz 2, 55131 Mainz, Germany. rschulze@mail.uni-mainz.de

OBJECTIVE: To develop an image analysis method for calculation of angular disparities between an object, temporarily equipped with a reference system, and a radiographic receptor. MATERIALS AND METHODS: A mathematical method based on a reference system containing two metallic spheres is developed, allowing calculation of inclination between the inter-spherical axis and the digital image receptor using image features. Experimental evaluation was done in standardized projection geometry for two sphere sizes at four randomly chosen inclinations per size, with each radiograph assessed three times. Truth was assessed threefold from photographs obtained at each inclination. RESULTS: Mean standard deviation between single assessments was 2.6 degrees. Significant differences (P Maloney/Rastogy=0.00) were found between absolute values of truth and calculated values (mean: -0.9 degrees; range: -6.0 degrees; 3.6 degrees), indicating a significant lack of accuracy. CONCLUSIONS: Although so far not sufficiently accurate, the method yields information relevant for correction of distortion in intra-oral radiology.


This article has been cited by other articles:


Home page
 Dentomaxillofac RadiolHome page
R. Schulze, O Weinheimer, D. Brullmann, F Roder, B d'Hoedt, and E Schoemer
Software for automated application of a reference-based method for a posteriori determination of the effective radiographic imaging geometry
Dentomaxillofac. Radiol., July 1, 2005; 34(4): 205 - 211.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
BJR DMFR IMAGING ALL BIR JOURNALS
Copyright © 2002 by the British Institute of Radiology.