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At least 91 records · Page 5Linked to original sources
PubMed1975

Compact foreign-made dental x-ray generators: an evaluation of their acceptability for effective dental radiography. II. Image characteristics and observer performance.

Imported generators, while inexpensive and compact, feature fixed peak kilovoltage and fixed milliamperage levels. These generators, because of the relative inflexibility of their operating characteristics, cannot be modified to produce radiographic image characteristics of equal diagnostic value to the domestic generators without compromises which are unacceptable.

Radiation Dosage↗
PubMed1982

The optimum circular field size for dental radiography with intraoral films.

Intraoral radiographs are often made with circular fields to irradiate the film, and in many instances these fields are much larger than the film. The feasibility of reducing a circular radiation field without increasing the probability of excessive cone cutting was evaluated clinically, and an optimum field size was determined. A circular radiation field 4.5 cm. at the tube end was found to minimize cone cutting and reduce the area of tissue irradiated by at least 44 percent. Findings suggest that current I.C.R.P. recommendations for a 6 to 7.5 cm. diameter circular field may be too liberal.

Humans↗
PubMed2000

Quantitative dental radiography with a new photostimulable phosphor system.

OBJECTIVE: The purposes of this report are to present a quantitative model for digital oral radiography and to evaluate a new photostimulable phosphor system for bone mass measurements. STUDY DESIGN: Noise, linearity, and precision were measured from stepwedge images and blank images through use of a special least-squares calibration method. The model was used to estimate lower limits of detection for observing small changes in bone mineral content. RESULTS: The response was virtually linear, and the noise level of 2% to 3% is less than that of digitized film images. The precision of measurements averaged over a region of interest was generally better than 0.5%. CONCLUSIONS: If the scatter fraction is measured for each patient, bone loss can be measured by using only extraoral standards. Assuming a scatter fraction of 50% and considering only instrumental errors, the detection limit is <0.02 g/cm(2) for large image areas (> or =7 mm(2)) and <0.3 mg over areas of 1 mm(2) or smaller.

Artifacts↗