Clinical study of the sensitivity and dynamic range of three digital systems, E-speed film and digitized film.
The objective of the present study was to clinically evaluate the sensitivity and dynamic range of three digital systems (Sens-A-Ray, CDR, Digora), digitized film and E-speed film. Five objects were submitted to three different kilovoltages and seven exposure times. In order to evaluate the relationship between exposure time and dosage, measurements were made in a dental x-ray unit with an ion chamber, X-ray timer and kVp meter. For each system, 105 radiographs were taken, totalling 525 images, that were evaluated by six trained observers by means of scoring from 0 to 4. The scores attributed to the images for each of the systems were submitted to analysis of variance and Turkey's test. The results showed statistically significant differences (p < 0.01) with the storage phosphor system producing the wider dynamic range, followed by the digitized film. The CDR system showed the greater sensitivity, followed by the Digora system.
Bóscolo
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FN
Division of Oral & Maxillofacial Radiology, Department of Oral Diagnostics, Faculty of Dentistry of Piracicaba, UNICAMP, Piracicaba, SP, Brazil. boscolof@fop.unicamp.br
Oliveira
A E
AE
Almeida
S M
SM
Haiter
C F
CF
Haiter Neto
F
F
D000704:Analysis of Variance; D004560:Electricity; D006801:Humans; D007568:Jaw / Q000000981:diagnostic imaging; D015588:Observer Variation; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement; D011861:Radiography, Dental / Q000295:instrumentation* / Q000379:methods*; D019252:Radiography, Dental, Digital; D012680:Sensitivity and Specificity; D018709:Statistics, Nonparametric; D014962:X-Ray Film