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 Fidler, A.
Right arrow Articles by Skaleric, U.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Fidler, A.
Right arrow Articles by Skaleric, U.

Dentomaxillofacial Radiology, Vol 31, Issue 2 106-112, Copyright © 2002 by British Institute of Radiology

ARTICLES

Impact of JPEG lossy image compression on quantitative digital subtraction radiography

A. Fidler, B. Likar, F. Pernus and U. Skaleric
University of Ljubljana, Faculty of Medicine, Department of Stomatology, Slovenia.

OBJECTIVES: The aim of the study was to evaluate the impact of JPEG lossy image compression on the estimation of alveolar bone gain by quantitative digital subtraction radiography (DSR). METHODS: Nine dry domestic pig mandible posterior segments were radiographed three times ('Baseline', 'No change', and 'Gain') with standardized projection geometry. Bone gain was simulated by adding artificial bone chips (1, 4, and 15 mg). Images were either compressed before or after registration. No change areas in compressed and subtracted 'No change-Baseline' images and bone gain volumes in compressed and subtracted 'Gain-Baseline' images were calculated and compared to the corresponding measurements performed on original subtracted images. RESULTS: Measurements of no change areas ('No change-Baseline') were only slightly affected by compressions down to JPEG 50 (J50) applied either before or after registration. Simulated gain of alveolar bone ('Gain-Baseline') was underestimated when compression before registration was performed. The underestimation was bigger when small bone chips of 1 mg were measured and when higher compression rates were used. Bone chips of 4 and 15 mg were only slightly underestimated when using J90, J70, and J50 compressions before registration. CONCLUSIONS: Lossy JPEG compression does not affect the measurements of no change areas by DSR. Images undergoing subtraction should be registered before compression and if so, J90 compression with a compression ratio of 1:7 can be used to detect and measure 4 mg and larger bone gain.


This article has been cited by other articles:


Home page
 Dentomaxillofac RadiolHome page
A Fidler, B Likar, and U Skaleric
Lossy JPEG compression: easy to compress, hard to compare.
Dentomaxillofac. Radiol., March 1, 2006; 35(2): 67 - 73.
[Abstract] [Full Text] [PDF]

Home page
 Dentomaxillofac RadiolHome page
A Gegler, C. Mahl, and V Fontanella
Reproducibility of and file format effect on digital subtraction radiography of simulated external root resorptions
Dentomaxillofac. Radiol., January 1, 2006; 35(1): 10 - 13.
[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.