Improving diagnostic quality of dark radiographs using indirect digital technique and lightening solutions

Occasionally, due to overexposure or overdevelopment, radiographs become darken. There is two way for improving the diagnostic quality of these radiographs. One is using lightening agents and the other is indirect digital radiography. The aim of this research was to evaluate and compare the diagnostic quality of dark radiographs after using lightening solutions and indirect digital radiography. For this experimental study, a dentulous phantom in the department of radiology was used. With bisecting angle technique, 50 Periodical radiographs were prepared from different dentulous areas of the maxilla and mandible. The control radiographs were prepared using standard technique. For obtaining test radiographs, the exposure time was increased by 1.5 times for each area to produce dark radiographs, the test and control radiographs were scanned and saved. The test radigraphs were lightened once with lightening solution and then they were lightened using photoshap program. Three trained postgraduate students were assigned to evaluate the radiographs in all five groups of images by giving grades to different anatomic parts based on their qualities. The data were statistically analyzed using Friedman and Wilcoxon tests. There were statistically significant differences between dark radiographs and the other four groups [p < 0.001]. Diagnostic quality of dark radiographs was improved by using lightening solution or indirect digital radiography. The mean score devoted to diagnosis quality of images lightened by lightening solution was more than those by indirect digital technique. By using lightening solution or indirect digital radiography, the diagnostic quality of darken radiographs can be improved, so there will be no need for repetition and this will prevent patients from excess exposure to irradiation. Lightening solutions are more effective than indirect digital technique

[Densitometric evaluation of visual characteristic of two X-ray panoramic films with three different processing solutions]

Particular attention should be paid to select the optimal combination of an emulsion solution, as different combinations of film and processing materials will produce different qualities of film and processing solution influencing the quality of radiographs with regard to visual characteristics such as density, contrast and fog. This study was performed to determine the best combination of the two different panoramic films, Agfa and Primax with three different processing solutions [Champion, Teifsaz, and Darootasvir]. In this experimental study, a total of 30 films were developed in three different processing solution: [1] Champion, [2] Teifsaz and [3] Darootasvir. A skull mankan of human was used in this investigation. Unexposed films of the same batch were developed together with exposed films in order to determine the fog and base densities. After processing densities, several spots were measured with a densitometer. Densitometry of films showed that there was a significant difference between mean density and contrast and fog of the two films in the three different solution [p<0.001]. Agfa and Primax panoramic films had the best combination regarding the contrast, density and fog with Champion solution followed by Teifsaz. To use Teifsaz solution we need more resarches to reach the best quality