6533b832fe1ef96bd129a322

RESEARCH PRODUCT

In vitro perception of low-contrast features in digital, film, and digitized dental radiographs: A receiver operating characteristic analysis

Ulrich GrasslRalf Schulze

subject

ScannerImage qualityRadiographymedia_common.quotation_subjectContrast MediaSensitivity and SpecificityLow contrastRadiography DentalStep wedgeContrast (vision)X-Ray Intensifying ScreensGeneral Dentistrymedia_commonMathematicsReceiver operating characteristic analysisReceiver operating characteristicPhantoms Imagingbusiness.industryX-Ray FilmRadiography Dental DigitalRadiographic Image EnhancementROC CurveSemiconductorsOtorhinolaryngologySurgeryOral SurgerybusinessNuclear medicine

description

Objective To compare experimentally the image quality of charged-coupled device (CCD)-based digital, flatbed scanner digitized, and dental film radiographs. Study design High-contrast standardized radiographs of an aluminum step wedge containing boreholes were obtained on dental radiographic film (F) and a CCD receptor (D). Digitization (S) was done with a flatbed scanner. Each radiograph was separated into 23 single images, 18 of which showed a dark spot. Thirty observers indicated their confidence on the visibility of the spots for a receiver operating characteristic (ROC) analysis. Results Mean Az values (area beneath the ROC curves) differed significantly (P < .05), being highest for D (Az = 0.76), followed by F (Az = 0.71) and S (Az = 0.60). Mean sensitivity of S (0.45) was significantly (P = .000) lower than for D (0.66) and F (0.67). Conclusion The difference between modality D and F was small. However, the inferior performance of S images, particularly in dark regions, could be clinically relevant.

yearjournalcountryeditionlanguage
2005-12-11Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
https://doi.org/10.1016/j.tripleo.2006.04.005