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RESEARCH PRODUCT

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

Bernd D'hoedtR SchulzeStephan Tobias Roman Rosing

subject

Contrast effectRadiographymedia_common.quotation_subjectContrast MediaSensitivity and SpecificityAbsorptiometry PhotonRadiography PanoramicHumansContrast (vision)MedicineGeneral DentistryDigital radiographymedia_commonObserver VariationPhantoms Imagingbusiness.industryX-Ray FilmReproducibility of ResultsRadiography Dental DigitalContrast perceptionOtorhinolaryngologyRadiographic Image Interpretation Computer-AssistedSurgeryOral SurgerybusinessNuclear medicineAnalog-Digital Conversion

description

Abstract 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)

yearjournalcountryeditionlanguage
2002-09-27Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
https://doi.org/10.1067/moe.2002.126450