Contrast perception in digitized panoramic radiographs compared with their film-based origin

Objectives. We sought to compare the visual image quality of film-based and digitized panoramic radiographs through use of a hole-containing test wedge. Study Design. An aluminum wedge containing 100 cells, of which 90 were given shallow holes, was exposed in the film-based Orthophos CD panoramic un...

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Published in:Oral surgery, oral medicine, oral pathology, oral radiology and endodontics oral medicine, oral pathology, oral radiology and endodontics, 2002-09, Vol.94 (3), p.388-394
Main Authors: Schulze, Ralf Kurt Willy, Rosing, Stephan Tobias Roman, d'Hoedt, Bernd
Format: Article
Language:English
Subjects:
Absorptiometry, Photon
Analog-Digital Conversion
Biological and medical sciences
Contrast Media
Dentistry
Humans
Investigative techniques, diagnostic techniques (general aspects)
Medical sciences
Miscellaneous. Technology
Observer Variation
Otorhinolaryngology. Stomatology. Orbit
Phantoms, Imaging
Radiodiagnosis. Nmr imagery. Nmr spectrometry
Radiographic Image Interpretation, Computer-Assisted
Radiography, Dental, Digital
Radiography, Panoramic
Reproducibility of Results
Sensitivity and Specificity
X-Ray Film
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Summary:Objectives. We sought to compare the visual image quality of film-based and digitized panoramic radiographs through use of a hole-containing test wedge. Study Design. An aluminum wedge containing 100 cells, of which 90 were given shallow holes, was exposed in the film-based Orthophos CD panoramic unit. Two radiographs subjectively exhibiting optimum contrast were selected. Films were digitized with a charge-coupled device flatbed scanner at 300 dpi. Films and digitized images were rated cellwise by 2 similar groups of 50 observers each with respect to spot perception. Results. The mean sensitivity was 0.26 ± 0.09 for film and 0.20 ± 0.07 for digitized images (P =.000), with a pronounced decline in the latter in regions of high background density. The average specificity was 0.93 ± 0.07 for film versus 0.92 ± 0.08 for digitized images (P = 0.213). Conclusion. Film yielded a significantly higher sensitivity, but this absolute difference was actually small compared with that of the digitized images. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2002;94:388-94)
ISSN:1079-2104
1528-395X
DOI:10.1067/moe.2002.126450