BJR
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
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 Google Scholar
Google Scholar
Right arrow Articles by Bridcut, R R
Right arrow Articles by Flynn, P
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Bridcut, R R
Right arrow Articles by Flynn, P
British Journal of Radiology 75 (2002),266-270 © 2002 The British Institute of Radiology

Short communication

Assessment of distortion in a three-dimensional rotational angiography system

R R Bridcut, BSc, MSc 1 R J Winder, BSc, MSc 1 A Workman, BSc, MSc 2 and P Flynn, MRCP, FRCR 3

1 Northern Ireland Regional Medical Physics Agency, Royal Victoria Hospital, Grosvenor Road, Belfast BT12 6BA, 2 Northern Ireland Regional Medical Physics Agency, Forster Green Hospital, 110 Saintfield Road, Belfast BT8 4HD and 3 Department of Neuroradiology, Royal Group of Hospitals, Grosvenor Road, Belfast BT12 6BA, UK

The purpose of this project was to determine the degree of geometrical distortion in a three-dimensional (3D) image volume generated by a digital fluorography system with rotational image acquisition capabilities. 3D imaging is a valuable adjunct in neuroangiography for visualization and measurement of cerebral aneurysms and for determination of the optimum projection for intervention. To enable spatially accurate 3D reconstruction the system must correct for geometrical distortion in the image intensifier television system as well as for deviations in gantry motion. 3D volumes were reconstructed from 100 X-ray projections acquired over a 180° arc over a period of 8 s. A phantom was constructed to assess geometrical distortion in the three dimensions. The phantom consisted of 1 mm diameter ball bearings embedded in Perspex in a cubic lattice configuration. The ball bearings were placed at 20 mm intervals over a 140 mm cubic volume. Distortion was assessed by taking measurements between points of known separation and using a differential distortion measurement. The maximum error in the 3D location of objects was found to be 1.4 mm, while the differential distortion was found to range from -1.0% to +2.3%. The 3D images were found to have negligible visual distortion, enabling subjective assessments to be made with confidence to aid intervention.






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