Search results for "X-Ray Intensifying Screens"

showing 2 items of 2 documents

Advantages of fitting contrast curves using logistic function: a technical note.

2013

Objective The aim of this article is to demonstrate how the contrast properties of an imaging system can be ideally fitted with the use of stripe patterns and the logistic function. Study Design Stripe patterns with defined amounts of line pairs (lp/mm) per mm (10-20 lp/mm) were recorded with the use of digital photostimulable storage phosphor. Scan data and normalized image data were analyzed with the use of ImageJ and MatLab to calculate different contrast curves. Results For original scan data, the goodness of fit was 0.0000019 (sum of squared error [SSE]). The R-square was 0.9998. For normalized data the goodness of fit was 0.0007 (SSE) and the R-square 0.998. An amount of 50% contrast …

Mean squared errorComputer scienceContrast (statistics)Image processingRadiography Dental DigitalPathology and Forensic MedicineRadiographic Image EnhancementLogistic ModelsGoodness of fitStatisticsLine (geometry)Image Processing Computer-AssistedHumansRadiology Nuclear Medicine and imagingDentistry (miscellaneous)SurgeryRadiographic Image EnhancementX-Ray Intensifying ScreensOral SurgeryLogistic functionMATLABcomputerAlgorithmAlgorithmscomputer.programming_languageOral surgery, oral medicine, oral pathology and oral radiology
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In vitro perception of low-contrast features in digital, film, and digitized dental radiographs: A receiver operating characteristic analysis

2005

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 …

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 medicineOral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
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