Effect of alternative photostimulable phosphor plates erasing times on subjective digital image quality

Abstract

Objective: To evaluate the influence of alternative erasing times of DenOptixH (Dentsply/ Gendex, Chicargo, IL) digital plates on subjective image quality and the probability of double exposure image not occurring. Methods: Human teeth were X-rayed with phosphor plates using ten different erasing times. Two observers evaluated the images for subjective image quality (sharpness, brightness, contrast, enamel definition, dentin definition and dentin-enamel junction definition) and for the presence or absence of double exposure image. Spearman's correlation analysis and ANOVA was performed to verify the existence of a linear association between the subjective image quality parameters and the alternative erasing times. A contingency table was constructed to evaluate the agreement among the observers, and a binominal logistic regression was performed to verify the correlation between the erasing time and the probability of double exposure image not occurring. Results: All 6 parameters of image quality were rated high by the examiners for the erasing times between 25 s and 130 s. The same erasing time range, from 25 to 130 s, was considered a safe erasing time interval, with no probability of a double exposure image occurring. Conclusions: The alternative erasing times from 25 s to 130 s showed high image quality and no probability of double image occurrence. Thus, it is possible to reduce the operating time of the DenOptixH digital system without jeopardizing the diagnostic task.

The effect of delayed scanning of storage phosphor plates on occlusal caries detection

“…12,18,19 After evaluating the effect of different erasing times on proximal caries diagnosis, Melo et al 12 reported no significant difference in both pixel intensity values and diagnostic accuracy of observers. Since the effect of various erasing times was tested, the methods of the former and the presented study were basically not the same; therefore, the comparison of the results may not be relevant.…”

The Effect of Delayed Scanning of Photostimulable Phosphor Plates on Inter-proximal Caries Detection

“…Some recent studies [16,21,23] evaluated the effect of different times of erasing data from PSPs on the quality of inter-proximal caries detection; Melo reported no effect on caries detection ability [16]. Result comparison between Melo's study and our study regarding this matter is not feasible due to fundamental and structural differences.…”

Fosfor Plak Sistemlerinde Karşilaşilan Temel Sorunlar

“…26 Silme süresinin değerlendirildiği farklı çalıĢmalar olmakla birlikte Melo ve ark. 29 plakların en az 25 saniye süreyle 1700 lux ıĢığa maruz bırakılması gerektiğini bildirmiĢlerdir. Bu sürenin altındaki uygulamalarda görüntünün kontrast, parlaklık, keskinliğinin azaldığı, mine, dentin ve mine-dentin sınırının net izlenemediği ve görüntüde "çift görüntü" oluĢtuğu rapor edilmiĢtir.…”

“…Bu sürenin altındaki uygulamalarda görüntünün kontrast, parlaklık, keskinliğinin azaldığı, mine, dentin ve mine-dentin sınırının net izlenemediği ve görüntüde "çift görüntü" oluĢtuğu rapor edilmiĢtir. 29 Tarayıcıya bağlı olarak, görüntüde fazladan horizontal beyaz çizgi oluĢması, tarama parametrelerinin optimal olmasına karĢılık görüntünün çok parlak olması (ġekil 3), ekranda görüntünün sadece bir kısmının oluĢması, görüntü boyutunun küçülmesi, farklı iki görüntünün süperpoze olması (ġekil 4) gibi artefaktlar oluĢabilir. Bu gibi durumlarda plaklar taranırken silinmemiĢse aynı plak yeniden tarandığında görüntünün düzgün bir Ģekilde elde edildiği bildirilmiĢtir.…”